Relevant bibliographies by topics / Wilting point permanent

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Academic literature on the topic 'Wilting point permanent'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Wilting point permanent"

1

Obi, Chinedu Innocent, Jude C. Obi, and Emmanuel U. Onweremadu. "Modeling of Permanent Wilting from Particle Size Fractions of Coastal Plain Sands Soils in Southeastern Nigeria." ISRN Soil Science 2012 (July 31, 2012): 1–5. http://dx.doi.org/10.5402/2012/198303.

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Permanent wilting points in soils have been found to correlate significantly with particle size fractions. This study was conducted to establish functional relationship between soil particle size fractions and permanent wilting point of soils of coastal plain sands in southeastern Nigeria. A total of 102 surface samples were collected from three different dominantly Ultisols toposequences (i.e., 34 samples from each). Permanent wilting point experiment was carried out in pots with the 102 samples in the greenhouse while the particle size analysis was carried out in the laboratory. There was significant correlation among the textural separates, permanent wilting point correlated significantly with clay (, ). The general linear model showed significant differences between permanent wilting point of soils found in the upper and lower slope positions. Regression equation established that 54% of the total variation in permanent wilting point could be accounted for by the clay and coarse sand content of the soils. Prediction of permanent wilting point of Ultisols formed on coastal plain sands soils of humid tropical southeastern Nigeria will effectively depend on reliability of determination of clay and coarse sand contents of the soils.
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2

Laktionova, T., and S. Nakisko. "Particle Size Distribution as a Basic Characteristic for Pedotransfer Prediction of Permanent Wilting Point." Agricultural Science and Practice 1, no. 1 (2014): 13–19. http://dx.doi.org/10.15407/agrisp1.01.013.

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The permanent wilting point (PWP) belongs to the basic soil hydrological constants and plays the important role in an estimation of the natural or irrigating moisture availability to agricultural plants. Direct measurement of hydrological parameters demands signifi cant amount of time, efforts and equipment. Pedotransfer functions (PTF) can provide an alternative way to an estimation of these parameters indirectly, by calculation, using accessible parameters of the basic soil properties in soil databases. Aim. To work out new PTF for an estimation of permanent wilting point in the chernozem soils of Ukraine. Methods. For the purpose of PTF working out, the multivariate linear regression equations have been applied. Data from the Ukrainian Soil Database are used for calibration of models sample included 239 data sets of permanent wilting point and particle size distribution (PSD) values obtained by direct measurement in the top genetic horizon of both typical and ordinary chernozems. Independently, 59 data sets have been used for verifi cation of models. Results. The best model among several considered has been recognized that one, where the contents’ parameters of three grain size fractions (according to N. A. Kachinskyi’s classifi cation) – 0.01−0.005, 0.005−0.001 and < 0.001 mm (%) – have been identifi ed as the essential independent variables. Thus, accuracy of the forecast (R 2 = 0.64) is quite admissible. Conclusions. Forecasting of permanent wilting point by construction of the pedotransfer function including three fractions of particles is tangibly possible, considering availability of PSD data in a soil database.
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3

Dayana, Ingri, Bandi Hermawan, Yudhi Harini Bertham, and Dwi Wahyuni Ganefianti. "Effects of Arbuscular Mycorrhiza Fungi and Coffee Pulp Compost in Improving Soil Water Uptake by Chilli Around the Permanent Wilting Point Conditions." TERRA : Journal of Land Restoration 3, no. 1 (2020): 23–26. http://dx.doi.org/10.31186/terra.3.1.23-26.

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Soil water availability to the plants is a range of water content between the field capacity and the permanent wilting point (PWP) conditions. The PWP is defined as the lower limit of soil water content that the plant can extract water from the soil as indicated by the symptoms of wilting plants. This is because plant roots are unable to penetrate the soil micropores that contain the water. The study aims to analyze the effects of arbuscular mycorrhizal fungi (AMF) and compost in enhancing soil water absorption by the plant when the water content is close to the permanent wilting point. Four doses of AMF (0, 5, 10 and 15 g.plant-1) and three doses of coffee pulp-made compost (0, 5 and 10 ton.ha-1) were arranged according to a randomized complete block design with three replicates. Results showed that the application of AMF significantly enabled the plant to improve water uptake when the soil water content was about at the permanent wilting point conditions. The AMF addition of 15 g.plant-1 significantly prolonged the growing period of chili to wither and the plant showed the wilting symptoms at the soil water content of 5 to 7% lower than the no-AMF plants. Improved water uptake under water stress conditions was attributed to increases in the root colonization by AMF.
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4

Bussiéres, P., J. Hostalery, and A. Battilani. "SIMPLE DEVICE FOR ESTIMATING SOIL WATER CONTENT AT PERMANENT WILTING POINT." Acta Horticulturae, no. 613 (September 2003): 163–68. http://dx.doi.org/10.17660/actahortic.2003.613.21.

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5

Bechtold, Michel, Ullrich Dettmann, Lena Wöhl, Wolfgang Durner, Arndt Piayda, and Bärbel Tiemeyer. "Comparing Methods for Measuring Water Retention of Peat Near Permanent Wilting Point." Soil Science Society of America Journal 82, no. 3 (2018): 601–5. http://dx.doi.org/10.2136/sssaj2017.10.0372.

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6

Filgueiras, Roberto, Vinicius Mendes Rodrigues de Oliveira, Fernando França da Cunha, Everardo Chartuni Mantovani, and Epitácio Jose de Souza. "MODELOS DE CURVA DE RETENÇÃO DE ÁGUA NO SOLO." IRRIGA 1, no. 1 (2018): 115. http://dx.doi.org/10.15809/irriga.2016v1n1p115-120.

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MODELOS DE CURVA DE RETENÇÃO DE ÁGUA NO SOLO ROBERTO FILGUEIRAS¹; VINICIUS MENDES RODRIGUES DE OLIVEIRA²; FERNANDO FRANÇA DA CUNHA³; EVERARDO CHARTUNI MANTOVANI³ E EPITÁCIO JOSE DE SOUZA4 1 Doutorando em Engenharia Agrícola, Universidade Federal de Viçosa. Viçosa, MG. Email: roberto.f.filgueiras@ufv.br² Doutorando em Engenharia Agrícola, Universidade Federal de Viçosa. Viçosa, MG³ Prof. Dr. Departamento de Engenharia Agrícola, Universidade Federal de Viçosa. Viçosa, MG4 Doutorando em Agronomia (Ciência do Solo), UNESP. Ilha Solteira, SP. 1 RESUMO O objetivo deste trabalho foi comparar a umidade na capacidade de campo e ponto de murcha permanente obtida com os modelos de obtenção da curva de retenção de água no solo de van Genuchten e potencial e ainda comparar os valores de capacidade de campo obtidos com a tensão de 6 e 33 kPa. Para isto ajustaram-se os modelos van Genuchten e potencial para as tensões de 10, 30, 50, 100, 500 e 1500 kPa, através da câmara de Richards. Posteriormente, encontrou-se os valores de umidade para as tensões na capacidade de campo (6 e 33 kPa) e ponto de murcha permanente (1500 kPa). Ambos os modelos predisseram a umidade na capacidade de campo a 33 kPa e o ponto de murcha permanente com alta precisão, exatidão e concordância, quando comparado os dois métodos. Palavras-chave: van Genuchten, potencial, capacidade de campo. FILGUEIRAS R.; DE OLIVEIRA V. M. R.; CUNHA F. F. DA; MANTOVANI E. C.; E. J. DE SOUZA.WATER RETENTION CURVE MODELS IN THE SOIL 2 ABSTRACT The objective of this study was to compare the moisture at field capacity and permanent wilting point obtained by the models and potential for obtaining the soil water retention curve by van Genuchten, also comparing the field capacity values with the tension of 6 and 33 kPa. Thus, it adjusted the van Genuchten model and potential for voltages of 10, 30, 50, 100, 500 and 1500 kPa through Richards chamber, subsequently finding the moisture values for the voltages at field capacity (6 and 33 kPa) and permanent wilting point (1500 kPa). Both models predicted moisture at field capacity at 33 kPa and the permanent wilting point with high precision, accuracy and harmony, when the two methods are compared. Keywords: van Genuchten , potential, field capacity.
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7

., Bilal Cemek, Ramazan Meral ., Mehmet Apan ., and Hasan Merdun . "Pedotransfer Functions for the Estimation of the Field Capacity and Permanent Wilting Point." Pakistan Journal of Biological Sciences 7, no. 4 (2004): 535–41. http://dx.doi.org/10.3923/pjbs.2004.535.541.

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8

Chen, Chong, Hu Zhou, Jianying Shang, Kelin Hu, and Tusheng Ren. "Estimation of soil water content at permanent wilting point using hygroscopic water content." European Journal of Soil Science 71, no. 3 (2019): 392–98. http://dx.doi.org/10.1111/ejss.12887.

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9

Silva, Bruno Montoani, Érika Andressa da Silva, Geraldo César de Oliveira, Mozart Martins Ferreira, and Milson Evaldo Serafim. "Plant-available soil water capacity: estimation methods and implications." Revista Brasileira de Ciência do Solo 38, no. 2 (2014): 464–75. http://dx.doi.org/10.1590/s0100-06832014000200011.

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The plant-available water capacity of the soil is defined as the water content between field capacity and wilting point, and has wide practical application in planning the land use. In a representative profile of the Cerrado Oxisol, methods for estimating the wilting point were studied and compared, using a WP4-T psychrometer and Richards chamber for undisturbed and disturbed samples. In addition, the field capacity was estimated by the water content at 6, 10, 33 kPa and by the inflection point of the water retention curve, calculated by the van Genuchten and cubic polynomial models. We found that the field capacity moisture determined at the inflection point was higher than by the other methods, and that even at the inflection point the estimates differed, according to the model used. By the WP4-T psychrometer, the water content was significantly lower found the estimate of the permanent wilting point. We concluded that the estimation of the available water holding capacity is markedly influenced by the estimation methods, which has to be taken into consideration because of the practical importance of this parameter.
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10

Hohenegger, Cathy, and Bjorn Stevens. "The role of the permanent wilting point in controlling the spatial distribution of precipitation." Proceedings of the National Academy of Sciences 115, no. 22 (2018): 5692–97. http://dx.doi.org/10.1073/pnas.1718842115.

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Convection-permitting simulations on an idealized land planet are performed to understand whether soil moisture acts to support or impede the organization of convection. Initially, shallow circulations driven by differential radiative cooling induce a self-aggregation of the convection into a single band, as has become familiar from simulations over idealized sea surfaces. With time, however, the drying of the nonprecipitating region induces a reversal of the shallow circulation, drawing the flow at low levels from the precipitating to the nonprecipitating region. This causes the precipitating convection to move over the dry soils and reverses the polarity of the circulation. The precipitation replenishes these soils with moisture at the expense of the formerly wet soils which dry, until the process repeats itself. On longer timescales, this acts to homogenize the precipitation field. By analyzing the strength of the shallow circulations, the surface budget with its effects on the boundary layer properties, and the shape of the soil moisture resistance function, we demonstrate that the soil has to dry out significantly, for the here-tested resistance formulations below 15% of its water availability, to be able to alter the precipitation distribution. We expect such a process to broaden the distribution of precipitation over tropical land. This expectation is supported by observations which show that in drier years the monsoon rains move farther inland over Africa.
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