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Journal articles on the topic 'Soil color indices'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Parviz, Laleh. "Performance evaluation of remote sensing data with machine learning technique to determine soil color." Polish Journal of Soil Science 53, no. 1 (2020): 97. http://dx.doi.org/10.17951/pjss.2020.53.1.97.

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<p>The aim of the present research is the determination of soil color by spectral bands and indices obtained from MODIS images. For this purpose, soil samples were collected from East Azerbaijan Province (Iran) and their color and texture were investigated through Munsell color system and hydrometer method, respectively. Stepwise regression, principle component analysis and sensitivity function methods were employed to find the dominant indices and bands using artificial neural network (ANN) as one of the machine learning techniques. The improved indices as the model input had better per

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Mandal, Umesh K. "SPECTRAL COLOR INDICES BASED GEOSPATIAL MODELING OF SOIL ORGANIC MATTER IN CHITWAN DISTRICT, NEPAL." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B2 (June 7, 2016): 43–48. http://dx.doi.org/10.5194/isprsarchives-xli-b2-43-2016.

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Space Technology provides a resourceful-cost effective means to assess soil nutrients essential for soil management plan. Soil organic matter (SOM) is one of valuable controlling productivity of crops by providing nutrient in farming systems. Geospatial modeling of soil organic matter is essential if there is unavailability of soil test laboratories and its strong spatial correlation. In the present analysis, soil organic matter is modeled from satellite image derived spectral color indices. Brightness Index (BI), Coloration Index (CI), Hue Index (HI), Redness Index (RI) and Saturation Index (

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Mandal, Umesh K. "SPECTRAL COLOR INDICES BASED GEOSPATIAL MODELING OF SOIL ORGANIC MATTER IN CHITWAN DISTRICT, NEPAL." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B2 (June 7, 2016): 43–48. http://dx.doi.org/10.5194/isprs-archives-xli-b2-43-2016.

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Space Technology provides a resourceful-cost effective means to assess soil nutrients essential for soil management plan. Soil organic matter (SOM) is one of valuable controlling productivity of crops by providing nutrient in farming systems. Geospatial modeling of soil organic matter is essential if there is unavailability of soil test laboratories and its strong spatial correlation. In the present analysis, soil organic matter is modeled from satellite image derived spectral color indices. Brightness Index (BI), Coloration Index (CI), Hue Index (HI), Redness Index (RI) and Saturation Index (

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SALA, Florin, Mihai HERBEI, and Cristian CONSTANTINESCU. "Model to Estimate Soil Erosion Based on Imaging Analysis." Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Horticulture 76, no. 1 (2019): 96. http://dx.doi.org/10.15835/buasvmcn-hort:2018.0022.

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The study aimed to development a prediction model for soil erosion degree by image analysis techniques. The spectral information was obtained by image analysis in the RGB and HSB color system, and by calculus resulted rgb normalized values. Specific indices were calculated: intensity (INT), normalized difference index (NDI) and dark green color index (DGCI). The correlation analysis emphasized the existence of high levels of interdependence between specific indices and normalized color data rgb, respectively luminance (L). The regression analysis has enabled the creation of estimation models f

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D. M. Woebbecke, G. E. Meyer, K. Von Bargen, and D. A. Mortensen. "Color Indices for Weed Identification Under Various Soil, Residue, and Lighting Conditions." Transactions of the ASAE 38, no. 1 (1995): 259–69. http://dx.doi.org/10.13031/2013.27838.

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Chen, Xuehong, Zhengfei Guo, Jin Chen та ін. "Replacing the Red Band with the Red-SWIR Band (0.74ρred+0.26ρswir) Can Reduce the Sensitivity of Vegetation Indices to Soil Background". Remote Sensing 11, № 7 (2019): 851. http://dx.doi.org/10.3390/rs11070851.

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Most vegetation indices (VIs) of remote sensing were designed based on the concept of soil-line, which represents a linear correlation between bare soil reflectance at the red and near-infrared (NIR) bands. Unfortunately, the soil-line can only suppress brightness variation, not color differences of bare soil. Consequently, soil variation has a considerable impact on vegetation indices, although significant efforts have been devoted to this issue. In this study, a new soil-line is established in a new feature space of the NIR band and a virtual band that combines the red and shortwave-infrared

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Abewa, Anteneh, Enyew Adgo, Birru Yitaferu, et al. "Teff Grain Physical and Chemical Quality Responses to Soil Physicochemical Properties and the Environment." Agronomy 9, no. 6 (2019): 283. http://dx.doi.org/10.3390/agronomy9060283.

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Teff is the only cultivated cereal crop from the genus Eragrostis and it is the major staple food of Ethiopians. In Ethiopia, the quality of teff and its market price are primarily determined by its grain color. The objective of this study was to evaluate the effects of soil physicochemical characteristics across multiple locations in the two main teff growing regions of Amhara and Oromia states in Ethiopia on teff grain color and nutritional quality of a single variety. Grain and soil samples were collected from 24 field sites cultivated with the popular teff variety ‘Quncho’ (DZ-Cr-387/RIL-3

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Helms, John G., Sally F. McGill, and Thomas K. Rockwell. "Calibrated, late Quaternary age indices using clast rubification and soil development on alluvial surfaces in Pilot Knob Valley, Mojave Desert, southeastern California." Quaternary Research 60, no. 3 (2003): 377–93. http://dx.doi.org/10.1016/j.yqres.2003.08.002.

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AbstractThe orange coating (varnish) that forms on the undersides (ventral sides) of clasts in desert pavements constitutes a potential relative-age indicator. Using Munsell color notation, we semiquantified the color of the orange, ventral varnish on the undersides of clasts from 15 different alluvial fan and terrace surfaces of various ages ranging from less than 500 to about 25,000 yr. All of the surfaces studied are located along the central portion of the left-lateral Garlock fault, in the Mojave Desert of southern California. The amount of left-lateral offset may be used to determine the

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Sona, Giovanna, Daniele Passoni, Livio Pinto, et al. "UAV MULTISPECTRAL SURVEY TO MAP SOIL AND CROP FOR PRECISION FARMING APPLICATIONS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 6, 2016): 1023–29. http://dx.doi.org/10.5194/isprsarchives-xli-b1-1023-2016.

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New sensors mounted on UAV and optimal procedures for survey, data acquisition and analysis are continuously developed and tested for applications in precision farming. Procedures to integrate multispectral aerial data about soil and crop and ground-based proximal geophysical data are a recent research topic aimed to delineate homogeneous zones for the management of agricultural inputs (i.e., water, nutrients). Multispectral and multitemporal orthomosaics were produced over a test field (a 100 m x 200 m plot within a maize field), to map vegetation and soil indices, as well as crop heights, wi

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Sona, Giovanna, Daniele Passoni, Livio Pinto, et al. "UAV MULTISPECTRAL SURVEY TO MAP SOIL AND CROP FOR PRECISION FARMING APPLICATIONS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 6, 2016): 1023–29. http://dx.doi.org/10.5194/isprs-archives-xli-b1-1023-2016.

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New sensors mounted on UAV and optimal procedures for survey, data acquisition and analysis are continuously developed and tested for applications in precision farming. Procedures to integrate multispectral aerial data about soil and crop and ground-based proximal geophysical data are a recent research topic aimed to delineate homogeneous zones for the management of agricultural inputs (i.e., water, nutrients). Multispectral and multitemporal orthomosaics were produced over a test field (a 100 m x 200 m plot within a maize field), to map vegetation and soil indices, as well as crop heights, wi

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Liebig, Mark A., and John W. Doran. "Evaluation of farmers' perceptions of soil quality indicators." American Journal of Alternative Agriculture 14, no. 1 (1999): 11–21. http://dx.doi.org/10.1017/s0889189300007967.

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AbstractUnderstanding farmers' knowledge of soil quality and health is essential to ensure transfer of appropriate technology for on-farm assessments. The objective of this study was to evaluate farmers' knowledge of soil quality by comparing their perceptions of soil conditions for “good” and “problem” soils on their farms with values of soil quality indicators as determined by established assessment protocol. Twenty-four conventional and organic farmers throughout eastern Nebraska were paired within regions of similar climate, topography, and soil type and their perceptions of soil quality i

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Mesas-Carrascosa, Francisco-Javier, Ana I. de Castro, Jorge Torres-Sánchez, et al. "Classification of 3D Point Clouds Using Color Vegetation Indices for Precision Viticulture and Digitizing Applications." Remote Sensing 12, no. 2 (2020): 317. http://dx.doi.org/10.3390/rs12020317.

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Remote sensing applied in the digital transformation of agriculture and, more particularly, in precision viticulture offers methods to map field spatial variability to support site-specific management strategies; these can be based on crop canopy characteristics such as the row height or vegetation cover fraction, requiring accurate three-dimensional (3D) information. To derive canopy information, a set of dense 3D point clouds was generated using photogrammetric techniques on images acquired by an RGB sensor onboard an unmanned aerial vehicle (UAV) in two testing vineyards on two different da

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Barr, Amy, and Mark Bennett. "Precision Planting for sh2 Sweet Corn Stand Establishment." HortScience 33, no. 3 (1998): 535e—536. http://dx.doi.org/10.21273/hortsci.33.3.535e.

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The impact of soil type and planting depths on the emergence of three hybrids of shrunken 2 sweet corn with varying seed vigor was investigated. Two field trials were completed (planted on 18 Sept. 1996 and 6 May 1997) in a field containing Crosby and Kokomo soil types in Columbus, Ohio. Three sh2 hybrids (`Starship', `Skyline', and `Confection') were planted at 1.3-, 2.5-, and 5.1-cm depths with six replications on each of the two soils in the fall study. The same hybrids were planted the following spring with an adjustment to 2-, 4-, and 6-cm planting depths over the same soil types, and the

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Kim, Dong Sub, Da Uhm Lee, Jeong Ho Lim, Steven Kim, and Jeong Hee Choi. "Agreement Between Visual and Model-Based Classification of Tomato Fruit Ripening." Transactions of the ASABE 63, no. 3 (2020): 667–74. http://dx.doi.org/10.13031/trans.13812.

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Highlights Human visual classification and predictive models often disagree when only color indices are used. The degree of agreement is improved significantly when predictive models are cultivar-specific. The degree of agreement can be improved when firmness and carotenoid contents are considered. Abstract. Traditionally, the ripening stage of tomato fruit is determined by the observed percentage of red color on the fruit surface based on color charts provided by USDA standards. However, multiple observers can assign different ripening stages to the same tomato fruit due to subjectivity and/o

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Cycoń, Mariusz, Anna Markowicz, Tomasz J. Wąsik, and Zofia Piotrowska-Seget. "Application of Erythromycin and/or Raoultella sp. Strain MC3 Alters the Metabolic Activity of Soil Microbial Communities as Revealed by the Community Level Physiological Profiling Approach." Microorganisms 8, no. 12 (2020): 1860. http://dx.doi.org/10.3390/microorganisms8121860.

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Erythromycin (EM), a macrolide antibiotic, by influencing the biodiversity of microorganisms, might change the catabolic activity of the entire soil microbial community. Hence, the goal of this study was to determine the metabolic biodiversity in soil treated with EM (1 and 10 mg/kg soil) using the community-level physiological profiling (CLPP) method during a 90-day experiment. In addition, the effect of soil inoculation with antibiotic-resistant Raoultella sp. strain MC3 on CLPP was evaluated. The resistance and resilience concept as well as multifactorial analysis of data was exploited to i

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Viana, Jonathan dos S., Luiz Fabiano Palaretti, Vinicius M. de Sousa, et al. "Saline irrigation water indices affect morphophysiological characteristics of collard." Horticultura Brasileira 39, no. 1 (2021): 79–85. http://dx.doi.org/10.1590/s0102-0536-20210112.

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ABSTRACT Collard is a vegetable widely consumed in Brazil. However, the quality and production of this vegetable depend on the supply and quality of water. Water stress and saline stress can make it impossible to grow. The objective of this study was to evaluate the performance of morphophysiological characteristics of collard cv. Georgia under irrigation levels and saline indices after the first defoliation.The experiment was conducted in a greenhouse, under random blocks design, and the treatments consisted of combinations of five water electrical conductivities (CEi in dS m-1: C1 =0.80; C2

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Silva, Giovani O., Arione S. Pereira, Fernanda Q. Azevedo, Agnaldo DF Carvalho, and Jadir B. Pinheiro. "Selection of potato clones for tuber yield, vine maturity and frying quality." Horticultura Brasileira 36, no. 2 (2018): 276–81. http://dx.doi.org/10.1590/s0102-053620180222.

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ABSTRACT Development of Brazilian potato cultivars adapted to different growing conditions, production systems and regions of the country is very important to increase the competitiveness of the national potato chain. In this sense, the objective of this work was to verify the performance of advanced potato clones for tuber yield traits, vine maturity and frying quality. An experiment was carried out in Pelotas-RS in spring, 2014. A set of nine advanced potato clones and two control cultivars were evaluated using a randomized complete block design with four replicates. Plots consisted of singl

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Merwin, L. A., and G. D. Blanpied. "ALTERNATIVE ORCHARD GROUNDCOVER MANAGEMENT SYSTEMS AFFECT APPLE QUALITY AND MATURITY INDICES." HortScience 27, no. 6 (1992): 620c—620. http://dx.doi.org/10.21273/hortsci.27.6.620c.

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Alternative groundcover management systems (GMS) beneath establishing 'Jonagold' apple trees have been evaluated since 1986 in an orchard field test Tree-row GMS being studied include post-emergence herbicide (glyphosate) “killed sods”, pre-emergence herbicides (norflurazon and diuron). a crownvetch “living mulch”, hay-straw mulch, monthly cultivation, and a closely mowed sodgrass. Trees in herbicide and straw-mulch plots produced the most fruit in 1990, but in 1991 there were no GMS-related differences in crop load. Fruit were larger in herbicide and straw-mulch plots in 1990 and 1991, and re

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Mathieu, Renaud, Marcel Pouget, Bernard Cervelle, and Richard Escadafal. "Relationships between Satellite-Based Radiometric Indices Simulated Using Laboratory Reflectance Data and Typic Soil Color of an Arid Environment." Remote Sensing of Environment 66, no. 1 (1998): 17–28. http://dx.doi.org/10.1016/s0034-4257(98)00030-3.

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Orlewska, Kamila, Anna Markowicz, Zofia Piotrowska-Seget, Joanna Smoleń-Dzirba, and Mariusz Cycoń. "Functional Diversity of Soil Microbial Communities in Response to the Application of Cefuroxime and/or Antibiotic-Resistant Pseudomonas putida Strain MC1." Sustainability 10, no. 10 (2018): 3549. http://dx.doi.org/10.3390/su10103549.

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Cefuroxime (XM), the most commonly prescribed antibiotic from the cephalosporin group, may cause changes in the structure of the soil microbial community, and these changes may also be reflected in the alteration of its functionality. Therefore, due to the lack of studies on this topic, the scope of this study was to assess the functional diversity and catabolic activity of the microbial community in soil treated with XM (1 mg/kg and 10 mg/kg soil) using the community-level physiological profile (CLPP) approach during a 90-day experiment. In addition, the effect of antibiotic-resistant Pseudom

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Stoma, G. V., S. Yu Rozov, and N. I. Sukhanova. "Use of the color indices of humus soil horizons as indicators of soil evolution in the steppe zone of the Transvolga region under irrigation conditions." Eurasian Soil Science 48, no. 5 (2015): 457–67. http://dx.doi.org/10.1134/s1064229315050105.

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Gorban, V. A., O. V. Khmelenko, A. O. Huslistyj, and O. G. Tetiukha. "Influence of forest vegetation on color, reflectivity and humus content in ordinary chernozems." Питання степового лісознавства та лісової рекультивації земель 48 (October 8, 2019): 25–37. http://dx.doi.org/10.15421/441903.

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The effect of acacia and oak plantations on the color, reflectivity and humus content in ordinary chernozems was investigated. As a result, it was found that among the humus horizons of the studied soils, the darkest are the horizons H1 and H2 of the chernozem under steppe vegetation and oak planting, and the least dark – the horizon H of the chernozem under acacia plantation. These horizons are distinguished by the smallest values of H, S, B, R, G, B, L and the reflectivity and the highest values of C, M, Y, K. Chernozem under oak stands has the greatest variability of color characteristi

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Paltseva, Anna Alexandrovna, and Zhongqi Cheng. "Geospatial analysis and assessment of garden soil contamination in New York City." RUDN Journal of Agronomy and Animal Industries 14, no. 3 (2019): 239–54. http://dx.doi.org/10.22363/2312-797x-2019-14-3-239-254.

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Elevated trace metal concentrations, in particular, lead (Pb), are prevalent in urban soils and it is one of the main hurdles for urban agriculture. The growing popularity of gardening in urban areas could also mean increased public health risk. In this study, the spatial distribution of Pb in New York City gardens was analyzed and visualized by Geographic Information System (GIS) tools. Pollution level and ecological risks of gardens and overall New York City (NYC) were evaluated with different indices. The degree of the contamination factors was ranked as follows: Pb >Cu > Zn > Cr&g

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Joniec, Jolanta, and Magdalena Frąc. "Microbial functional diversity and enzymatic activity of soil degraded by sulphur mining reclaimed with various waste." International Agrophysics 31, no. 4 (2017): 465–73. http://dx.doi.org/10.1515/intag-2016-0078.

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Abstract The aim of the study was to evaluate microbial functional diversity based on community level physiological profiling and β-glucosidase activity changes in soil degraded by sulphur mining and subjected to reclamation with various waste. The experiment was set up in the area of the former ‘Jeziórko’ Sulphur Mine (Poland), on a soilless substrate with a particle size distribution of slightly loamy sand. The experimental variants included the application of post-flotation lime, sewage sludge and mineral wool. The analyses of soil samples included the assessment of the following microbiolo

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Bozhko, K. M. "Micromorphological and physical properties of southern ravine soils in Dnipropetrovsk region." Biosystems Diversity 22, no. 1 (2014): 38–45. http://dx.doi.org/10.15421/011405.

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The article contains the results of determination of physical and micromorphological properties of soils under natural ravine vegetation in the southern part of Dnipropetrovsk region. The value of ravine forests for the steppe zone of Ukraine is analyzed, and the methods of investigation are shown. Forest typology characteristics of the vegetation stationary test areas, as well as macro- and micromorphological characteristic of the soil profile, structural condition of the soil, its aggregate composition, and water stability of aggregates, are determined. Soil-forming processes in ravine ecosy

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Rêgo, Lunara G. da S., Jéssia J. A. da Silva, Carolina M. M. Souza, et al. "Pedogenesis in the Barreiras Formation Under Climates of Rio Grande do Norte, Brazil." Journal of Agricultural Science 11, no. 16 (2019): 19. http://dx.doi.org/10.5539/jas.v11n16p19.

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In Brazil, the state of Rio Grande do Norte has an important coastal zone and coastal Tableland areas along the Barreiras Formation, but there are few studies to locate and characterize soils with cohesive character. Therefore, this work was carried out to characterize pedons in the western and eastern mesoregions of the state, located in the Barreiras Formation and with different climatic conditions. The profile description and sample collection were carried out in March and April 2016. The characteristics of the profile identified were the sequence of horizons and their depth, soil color, te

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Hayati, Dwi, and Sri Yulianto Joko Prasetyo. "Prediksi Spasial Wilayah Resiko Tanah Longsor Di Jawa Tengah Berdasarkan SAVI, OSAVI, DVI, NDVI Menggunakan Krigging." Indonesian Journal of Computing and Modeling 1, no. 2 (2018): 80–86. http://dx.doi.org/10.24246/j.icm.2018.v1.i2.p80-86.

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Landslides are the process of moving rock periods (soil) due to gravity. On the spatial prediction of landslide occurrence in the District in Central Java based on vegetation index using kriging. The vegetation index is the amount of green vegetation values obtained from the processing of digital signal data of the brightness value of several satellite sensor data channels. Some of the vegetation index algorithms used are SAVI (Soil Adjusted Vegetation Index), OSAVI (Optimized Soil Adjusted Vegetation Index), DVI (Difference Vegetation Index), NDVI (Normalized Difference Vegetation Index). Kri

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Songsom, Veeranun, Werapong Koedsin, Raymond J. Ritchie, and Alfredo Huete. "Mangrove Phenology and Water Influences Measured with Digital Repeat Photography." Remote Sensing 13, no. 2 (2021): 307. http://dx.doi.org/10.3390/rs13020307.

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The intertidal habitat of mangroves is very complex due to the dynamic roles of land and sea drivers. Knowledge of mangrove phenology can help in understanding mangrove growth cycles and their responses to climate and environmental changes. Studies of phenology based on digital repeat photography, or phenocams, have been successful in many terrestrial forests and other ecosystems, however few phenocam studies in mangrove forests showing the influence and interactions of water color and tidal water levels have been performed in sub-tropical and equatorial environments. In this study, we investi

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Kuhne, Wendy W., Martine C. Duff, Katie Salvaggio, Nancy V. Halverson, and Ronald Staggs. "Desert camouflage and what wildlife see." NIR news 28, no. 8 (2017): 4–10. http://dx.doi.org/10.1177/0960336017738177.

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Desert, desert-scrub, savanna and sandy beach, and lakeshore environments can be particularly tricky in terms of camouflage selection due to their low vegetative density. Therefore many companies focus on the development of paint color schemes that match the vegetation and the desert soils/sands. However another factor in the consideration of which camouflage to purchase may lie in what the animal can see. White-tailed deer and similar large mammals have been shown to have three classes of photo pigments that are sensitive to the range of blue to yellow-green during day light hours and blue to

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Bell, G. E., B. M. Howell, G. V. Johnson, W. R. Raun, J. B. Solie, and M. L. Stone. "Optical Sensing of Turfgrass Chlorophyll Content and Tissue Nitrogen." HortScience 39, no. 5 (2004): 1130–32. http://dx.doi.org/10.21273/hortsci.39.5.1130.

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Differences in soil microenvironment affect the availability of N in small areas of large turfgrass stands. Optical sensing may provide a method for assessing plant N needs among these small areas and could help improve turfgrass uniformity. The purpose of this study was to determine if optical sensing was useful for measuring turfgrass responses stimulated by N fertilization. Areas of `U3' bermudagrass [Cynodon dactylon (L.) Pers.], `Midfield' bermudagrass [C. dactylon (L.) Pers. × C. transvaalensis Burtt-Davy], and `SR1020' creeping bentgrass (Agrostis palustris Huds.) were divided into rand

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Gadberry, Shane, Kevin Lawson, John Jennings, and Kenny Simon. "Use of an Unmanned Aerial Vehicle (UAV) to Document Vegetation Coverage Rate in Managed Grasslands Following a Historic River Flood." Journal of Animal Science 99, Supplement_2 (2021): 9–10. http://dx.doi.org/10.1093/jas/skab096.015.

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Abstract Our objective was to document the vegetation coverage rate of grasslands impacted by a historic flood event that occurred May and June 2019 within the Arkansas river valley. Primary flooding within the observation area lasted 21 d with a maximum water depth of 3m above flood stage. Three cooperator fields were monitored. Aerial images were captured at 7, 14, 33, and 48 d following water recession. Geo-referenced images were captured at 76.2 m above ground level using an UAV fitted with an integrated camera and a secondary camera with a near infrared filter. Images were stitched and al

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Valverde, Juan Carlos. "Estimation of leaf nitrogen content from nondestructive methods in Eucalyptus tereticornis and Eucalyptus saligna plantations." Revista Facultad Nacional de Agronomía Medellín 74, no. 3 (2021): 9655–66. http://dx.doi.org/10.15446/rfnam.v74n3.93619.

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The determination of leaf nitrogen content (LNC) by indirect methods is essential for silvicultural management of forest crops. The application of photography or rapid measurement equipment, such as chlorophyll index (soil-plant analysis development-SPAD), is increasingly used due to its low-cost, ease of estimation and accuracy. Therefore, the aim of this study was to estimate foliar nitrogen content from nondestructive methods in plantations of Eucalyptus tereticornis and Eucalyptus saligna using three urea treatments (120 kg N ha-1, 240 kg N ha-1 and a control treatment without urea). For e

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Wargo, James M., Ian Merwin, and Christopher Watkins. "574 Nitrogen, Trunk Scoring, and AVG Treatments Influence Fruit Color and Quality of `Jonagold' Apple." HortScience 35, no. 3 (2000): 495B—495. http://dx.doi.org/10.21273/hortsci.35.3.495b.

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`Jonagold' apple often has problems of inadequate red blush development at harvest, and loss of firmness and skin “greasiness” after refrigerated storage. During two growing seasons we tested factorial combinations of three preharvest treatments for managing these problems: 1) N fertilization (no applied N, 34 kg N/ha in May, or 1% (w/w) foliar urea sprays in May and June); 2) mid-summer trunk scoring (girdling); and 3) aminoethoxyvinylglycine (AVG) applications 3 weeks prior to harvest. Fruit were harvested at four weekly intervals each year, and evaluated for size, blush, firmness, soluble s

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Reynolds, Andrew G., Hyun-Suk Lee, Briann Dorin, et al. "Mapping Cabernet Franc vineyards by unmanned aerial vehicles (UAVs) for variability in vegetation indices, water status, and virus titer." E3S Web of Conferences 50 (2018): 02010. http://dx.doi.org/10.1051/e3sconf/20185002010.

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The hypothesis of this research was that the maps based on remotely-sensed images would create zones of different vigor, yield, water status, winter hardiness and berry composition and the wines from the unique zones would show different chemical and sensorial profiles. A second hypothesis was that titer of grapevine leafroll-associated virus (GLRaV) could be correlated spatially to NDVI and other spectral indices. To determine zonation, unmanned aerial vehicles (UAVs) with multispectral and thermal sensors were flown over six Cabernet Franc vineyard blocks in Ontario, Canada. Zonation was bas

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Liu, Yu, Kenji Hatou, Takanori Aihara, et al. "A Robust Vegetation Index Based on Different UAV RGB Images to Estimate SPAD Values of Naked Barley Leaves." Remote Sensing 13, no. 4 (2021): 686. http://dx.doi.org/10.3390/rs13040686.

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Chlorophyll content in plant leaves is an essential indicator of the growth condition and the fertilization management effect of naked barley crops. The soil plant analysis development (SPAD) values strongly correlate with leaf chlorophyll contents. Unmanned Aerial Vehicles (UAV) can provide an efficient way to retrieve SPAD values on a relatively large scale with a high temporal resolution. But the UAV mounted with high-cost multispectral or hyperspectral sensors may be a tremendous economic burden for smallholder farmers. To overcome this shortcoming, we investigated the potential of UAV mou

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Albetis, Johanna, Anne Jacquin, Michel Goulard, et al. "On the Potentiality of UAV Multispectral Imagery to Detect Flavescence dorée and Grapevine Trunk Diseases." Remote Sensing 11, no. 1 (2018): 23. http://dx.doi.org/10.3390/rs11010023.

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Among grapevine diseases affecting European vineyards, Flavescence dorée (FD) and Grapevine Trunk Diseases (GTD) are considered the most relevant challenges for viticulture because of the damage they cause to vineyards. Unmanned Aerial Vehicle (UAV) multispectral imagery could be a powerful tool for the automatic detection of symptomatic vines. However, one major difficulty is to discriminate different kinds of diseases leading to similar leaves discoloration as it is the case with FD and GTD for red vine cultivars. The objective of this paper is to evaluate the potentiality of UAV multispectr

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Sankaran, Sindhuja, Afef Marzougui, J. Preston Hurst, Chongyuan Zhang, James C. Schnable, and Yeyin Shi. "Can High-Resolution Satellite Multispectral Imagery Be Used to Phenotype Canopy Traits and Yield Potential in Field Conditions?" Transactions of the ASABE 64, no. 3 (2021): 879–91. http://dx.doi.org/10.13031/trans.14197.

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HighlightsVegetation indices (NDVI, GNDVI, and SAVI) extracted from high-resolution satellite imagery were significantly associated with vegetation indices extracted from UAV imagery.High-resolution satellite data can be used to predict maize yield at breeding plot scale.Breeding plot sizes and the variability between maize genotypes may be associated with prediction accuracies.Abstract. The recent availability of high spatial and temporal resolution satellite imagery has widened its applications in agriculture. Plant breeding and genetics programs are currently adopting unmanned aerial vehicl

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Torres-Sánchez, Jorge, Francisco Javier Mesas-Carrascosa, Luis-Gonzaga Santesteban, et al. "Grape Cluster Detection Using UAV Photogrammetric Point Clouds as a Low-Cost Tool for Yield Forecasting in Vineyards." Sensors 21, no. 9 (2021): 3083. http://dx.doi.org/10.3390/s21093083.

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Yield prediction is crucial for the management of harvest and scheduling wine production operations. Traditional yield prediction methods rely on manual sampling and are time-consuming, making it difficult to handle the intrinsic spatial variability of vineyards. There have been significant advances in automatic yield estimation in vineyards from on-ground imagery, but terrestrial platforms have some limitations since they can cause soil compaction and have problems on sloping and ploughed land. The analysis of photogrammetric point clouds generated with unmanned aerial vehicles (UAV) imagery

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Qi, Fucheng, Kunihiko Endo, Xiangmin Zheng, and Liming Zhou. "Proxy for Millennial Climate Change during the Last 50,000 Years in the Loess-paleosol Sequence at Shengshan Island in the East China Sea: Estimation by Soil Color Reflectance Indices (L*, a*, and b*)." Quaternary Research (Daiyonki-Kenkyu) 42, no. 2 (2003): 113–19. http://dx.doi.org/10.4116/jaqua.42.113.

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Astapova, M. A., and E. A. Аksamentov. "Use of Spectral Landscape Indices for Obstacle Detection in the Tasks of Mobile Robotic Platforms Navigation in Agricultural Areas." Proceedings of the Southwest State University 25, no. 1 (2021): 66–81. http://dx.doi.org/10.21869/2223-1560-2021-25-1-66-81.

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Purpose or research is to develop an algorithm for detecting obstacles on the orthophotomap based on the analysis of the spectral landscape indices in the tasks of mobile robotic equipment navigation in agricultural areas.Methods. The following landscape indices characterizing objects of various types on a map obtained by spectral aerial photography have been considered in the paper: normalized difference vegetation index (NDVI), normalized building difference index (NDBI), normalized difference water index (NDWI), and soil-adjusted vegetation index (SAVI). These indices provide an assessment

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Henrique Tondato Arantes, Bruno, George Deroco Martins, Everson Reis Carvalho, and Lorena Cristina Alves Nogueira. "IDENTIFICAÇÃO DE FERRUGEM NA SOJA POR MEIO DE IMAGENS DE ALTA RESOLUÇÃO ESPACIAL." Revista Brasileira de Geografia Física 12, no. 3 (2019): 1003. http://dx.doi.org/10.26848/rbgf.v12.3.p1003-1016.

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O cultivo da soja possui grande importância econômica para o Brasil, por ser um dos principais geradores de divisas cambiais para o país. Porém, mesmo sobre as tecnologias existentes, as lavouras ainda são constantemente acometidas por doenças foliares, tais como a ferrugem asiática (Phakopsora pachyrhizi), das quais é uma das doenças mais destrutivas para a produção de soja, que muitas vezes provoca perda de rendimento significativo e rapidamente dissemina-se de campo para campo através de uredósporos dispersos no ar. Para implementar tratamentos de fungicidas em tempo hábil a um controle efi

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Ghavidel, Marzieh, Peyman Bayat, and Mohammad Ebrahim Farashiani. "Satellite image processing of the Buxus hyrcana Pojark dieback in the Northern Forests of Iran." Journal of Forest Science 67, No. 2 (2021): 71–79. http://dx.doi.org/10.17221/56/2020-jfs.

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Pests and diseases can cause a variety of reactions in plants. In recent years, the boxwood dieback has become one of the essential concerns of practitioners and natural resources managers in Iran. To control the boxwood dieback spread, the early detection and disease distribution maps are required. The boxwood dieback causes a range of changes in colour, shape and leaf size with respect to photosynthesis and transpiration. Through remote sensing techniques, e.g. satellite image processing data, the variation of thermal and visual characteristics of the plant could be used to measure and illus

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ALLISON, M. F., J. H. FOWLER, and E. J. ALLEN. "Responses of potato (Solanum tuberosum) to potassium fertilizers." Journal of Agricultural Science 136, no. 4 (2001): 407–26. http://dx.doi.org/10.1017/s0021859601008863.

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Between 1989 and 1999, 33 experiments tested the effects of potassium (K) fertilizer on the yield and quality of potatoes. The experiments were done on a range of soil types and used varieties and management conditions common to modern commercial production. The average yield in these experiments was 48 t/ha. Nearly half of the experiments were done on soils that had exchangeable K values < 120 mg/l (MAFF Indices 0–1) but use of K fertilizer resulted in statistically significant increases in fresh weight yield in only seven experiments. Generally, soil exchangeable K was a poor predictor of

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Saputra, Hariadi, Yadi Setiadi, and Iwan Hilwan. "RESPON PERTUMBUHAN BIBIT ANGSANA (Pterocarpus indicus Willd.) TERHADAP MEDIA TUMBUH, PEMOTONGAN AKAR LATERAL DAN PEMBERIAN URIN SAPI Response of Angsana (Pterocarpus indicus Willd.) Seedling on Growing Media, Lateral Roots Cutting, and Cow’s Urine." Journal of Tropical Silviculture 8, no. 3 (2018): 154–59. http://dx.doi.org/10.29244/j-siltrop.8.3.154-159.

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Nursery is a process in producing good quality seedlings. Seedling quality is determined by physical-physiological quality including woody stem, health, height, diameter, number of leaves, leaf color and compactness of media. The quality of angsana seedlings in this study was observed using some growth media, lateral root cutting, and cow’s urine addition with various concentration and liquid organic fertilizer for 13 weeks. The study was conducted in a completely randomized design (CRD) in split plot with 3 growth mediums, 10 combinations of root-cutting and fertilizing treatment using 9 seed

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Ledderhof, David, Ralph Brown, Andrew Reynolds, and Marilyne Jollineau. "Using remote sensing to understand Pinot noir vineyard variability in Ontario." Canadian Journal of Plant Science 96, no. 1 (2016): 89–108. http://dx.doi.org/10.1139/cjps-2015-0120.

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The study objective was to determine whether multispectral high spatial resolution airborne imagery could be used to segregate zones in Pinot noir vineyards to target highest quality fruit for premium winemaking. We hypothesized that remotely sensed data would be correlated with vine size and leaf water potential (ψ), and by extension with yield and berry composition. In 2008–2009, multispectral (blue, green, red, near-infrared) airborne images were acquired from four Ontario Pinot noir vineyards (four dates, 2008; three, 2009), with the final flight date near veraison. A process was developed

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Németh, Imre, Szabina Molnár, Emese Vaszita, and Mónika Molnár. "The Biolog EcoPlate™ Technique for Assessing the Effect of Metal Oxide Nanoparticles on Freshwater Microbial Communities." Nanomaterials 11, no. 7 (2021): 1777. http://dx.doi.org/10.3390/nano11071777.

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The application of Biolog EcoPlate™ for community-level physiological profiling of soils is well documented; however, the functional diversity of aquatic bacterial communities has been hardly studied. The objective of this study was to investigate the applicability of the Biolog EcoPlate™ technique and evaluate comparatively the applied endpoints, for the characterisation of the effects of metal oxide nanoparticles (MONPs) on freshwater microbial communities. Microcosm experiments were run to assess the effect of nano ZnO and nano TiO2 in freshwater at 0.8–100 mg/L concentration range. The ave

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Levin, N., E. Ben‐Dor, and A. Singer. "A digital camera as a tool to measure colour indices and related properties of sandy soils in semi‐arid environments." International Journal of Remote Sensing 26, no. 24 (2005): 5475–92. http://dx.doi.org/10.1080/01431160500099444.

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Gérard, B., and A. Buerkert. "ESTIMATION OF SPATIAL VARIABILITY IN PEARL MILLET GROWTH WITH NON-DESTRUCTIVE METHODS." Experimental Agriculture 37, no. 3 (2001): 373–89. http://dx.doi.org/10.1017/s0014479701003088.

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Growth variability in pearl millet (Pennisetum glaucum) over short distances is a severe constraint on the interpretation of agricultural experiments in the West African Sahel. The purpose of this study, therefore, was to compare different non-destructive methods to estimate, spatially, millet growth and final yields. Aerial photography, georeferenced radiometric measurements and a chlorophyll meter were tested during three rainy seasons in a nitrogen rate×density×genotype experiment in western Niger. For the radiometric measurements, normalized difference vegetation indices (NDVI) obtained an

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Srisutham, Mallika, Ryoichi Doi, Anan Polthanee, and Masaru Mizoguchi. "Detection of Cassava Leaves in Multi-Temporally Acquired Digital Images of a Cassava Field Under Different Brightness Levels by Simultaneous Binarization of the Images Based on Indices of Redness/Greenness." Modern Applied Science 8, no. 5 (2014): 87. http://dx.doi.org/10.5539/mas.v8n5p87.

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Plant leaf area reveals various types of abnormalities which can enable appropriate plant/crop management actions. The quantification of plant leaf area is now feasible using commonly available digital photographing tools. Changes in brightness, however, make it difficult to compare leaf areas in digital photographs acquired at multiple time points. This difficulty could be overcome by employing an index of redness/greenness (R/G), which was suggested to be one of the best indices to discriminate between plant leaves and other objects such as soils. R/G and other indices were examined when dis

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Kotlarz, Anna, Agnieszka Sujak, Wacław Strobel, and Wilhelm Grzesiak. "Chemical Composition and Nutritive Value of Protein of the Pea Seeds - Effect of Harvesting Year and Variety." Vegetable Crops Research Bulletin 75, no. 1 (2011): 57–69. http://dx.doi.org/10.2478/v10032-011-0018-2.

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Chemical Composition and Nutritive Value of Protein of the Pea Seeds - Effect of Harvesting Year and VarietyWe tested nutritional usability of pea seeds (Pisum sativumL.) at full maturity. Four white-flowering and 5 colour-flowering new Polish cultivars were compared. We determined proximate composition of ground seeds collected over 4 years period as well as amino acids, minerals (Ca, P, Na, K), tannins and fiber fractions (NDF, ADF, ADL). The seeds contained between 224 and 260 g·kg-1of crude protein which was rich in Lys (6.8±0.8 g) but poor in Met+Cys (2.0±0.2 g·16 g-1N). The amount of tan

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