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Dissertations / Theses on the topic 'Agronomic measurements'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Roth, Guy W., and n/a. "Agronomic measurements to validate airborne video imagery for irrigated cotton management." University of Canberra. Resource and Environmental Sciences, 1993. http://erl.canberra.edu.au./public/adt-AUC20050801.124927.

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Water is a major factor limiting cotton production and farmers must aim to optimise crop water use through timely irrigation scheduling decisions. Airborne video imagery when calibrated with a low density of ground based observations, offers the potential for near real time monitoring of crop condition, through sequential coverages of entire cotton fields. Using commercially available video equipment mounted on a light aircraft images were acquired of field experiments that were established in commercial cotton fields to test if the imagery could monitor changes in crop condition. Ground data

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2

Arif, Mobeen. "Measurement of horticulture produce quality." Thesis, Cranfield University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273953.

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3

Aldakheel, Yousef Yacoub. "Remote sensing of crop water stress : measurements and modelling." Thesis, University of Salford, 1998. http://usir.salford.ac.uk/43021/.

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4

Parker, Steven Roy. "Studies on some factors influencing the reliability of disease measurements in winter wheat crops." Thesis, University of Bristol, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336955.

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5

Siqueira, Rafael Telles Tenorio de. "Characterizing nitrogen deficiency of maize at early growth stages using fluorescence measurements." Thesis, Colorado State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10138898.

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<p> Among all nutrients that are important for crop production, nitrogen (N) is one of the least efficiently utilized, mainly due to its high mobility in soil. The possibility of using crop sensing in real-time to detect variability in N deficiency within a field has the potential to enhance N efficiency, increase crop yield, and reduce potential environmental risks and crop production costs. Potassium (K), another important crop nutrient, can also lead to higher yield when applied in the right amount and manner. Real-time fluoro-sensing is a new technology for crop sensing and studies have sh

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6

Waine, Toby William. "Non-invasive soil property measurement for precision farming." Thesis, Cranfield University, 1999. http://dspace.lib.cranfield.ac.uk/handle/1826/11322.

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This work investigates the application of new sensors to enable agronomists and farm managers to make decisions for variable treatment strategies at key crop growth stages. This is needed to improve the efficiency of crop production in the context of precision farming. Two non-invasive sensors were selected for investigation. These were: 1) The MGD-1 ion mobility gas detector made by Environics OY, Finland. 2) The EM38 electromagnetic induction (EMI) sensor made by Geonics Inc., Canada. The gas detector was used to determine residual nitrogen and to measure carbon dioxide gas as a surrogate in

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7

Steger, Adele Johnson 1952. "Timing the initial post-plant irrigation for cotton using leaf water potential measurements." Thesis, The University of Arizona, 1995. http://hdl.handle.net/10150/278489.

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A two year study was conducted to determine the optimum timing of the initial post-plant irrigation for cotton (Gossypium hirsutum L.). A short-season Upland variety, DPL 20, was planted on 19 April 1993 and 15 April 1994 at the Marana Agricultural Center. Daily midday leaf water potential measurements were taken using the pressure chamber technique. Treatments, designated T1, T2, and T3, received the initial post-plant irrigation when the midday LWP measured -1.5, -1.9, and -2.3 MPa, respectively. Soil-water data was collected at 25 cm depth increments using neutron attentuation. Yields were

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8

Baum, Kristen A. "Air emissions measurements at cattle feedlots." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/775.

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9

Moreno-Urquiza, Magdalena 1967. "Intelligent data acquisition system for continuous measurements of soil moisture in the field." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/278271.

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A data acquisition system to collect soil moisture readings at 60 field locations was developed. The system predicted a resistance value from a measured counts per time. An error was associated with the measured counts and time, however, this error was minimized by increasing the time for resistance measurement. The effect of temperature was minimized by an automatic calibration of the system before collecting readings. The Watermark electrical resistance moisture sensor was used to sense water content. The system, including eight sensors, was tested in the field. The data collected was diffic

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10

Aldosari, Saleh 1964. "Measurement of and selection for insecticide resistance in various populations of beet armyworm Spodoptera Exigua (Hubner)." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/278716.

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A comparative study was performed to investigate the tolerance levels of beet armyworm to three insecticides, cyfluthrin, profenofos, and methomyl. The field strains were collected from Yuma and Marana, AZ whereas the susceptible laboratory strain was obtained from California. Dosage-mortality data were obtained by topical application on third instar larvae. Compared to the susceptible strain, both Yuma and Marana strains exhibited an increase in the LD50 to cyfluthrin by 15.65 and 5.45-fold, respectively. Both strains also exhibited an increase in the LD50 to profenofos and methomyl by 14.10,

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11

Arango, Argoti Miguel Andres. "Nitrous oxide emissions: measurements in corn and simulations at field and regional scale." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/16680.

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Doctor of Philosophy<br>Department of Agronomy<br>Charles W. Rice<br>Nitrogen is critical for plant growth and is a major cost of inputs in production agriculture. Too much nitrogen (N) is also an environmental concern. Agricultural soils account for 85% of anthropogenic N₂O which is a major greenhouse gas. Management strategies for N fertilization and tillage are necessary for enhancing N use efficiency and reducing negative impacts of N to the environment. The different management practices induce changes in substrate availability for microbial activity that may result in increasing or r

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12

Daggupati, Naga Prasad. "Assessment of the varitarget nozzle for variable rate application of liquid crop protection products." Thesis, Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/414.

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13

CHIAZZESE, MURJAL. "Estimation of N2O and CO2 emissions from organic and N fertilizers by coupling field measurements with modelling analysis." Doctoral thesis, Università Cattolica del Sacro Cuore, 2015. http://hdl.handle.net/10280/6529.

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L'effetto dei gas serra sul cambiamento climatico ha portato molti esperti a considerare la riduzione delle emissioni di gas serra come strategia per il riscaldamento globale. In particolare tale fenomeno è causato dall’anidride carbonica (CO2), metano (CH4) e il protossido di azoto (N2O). E 'ampiamente accettato che la principale fonte antropica di gas a effetto serra (tranne CO2) è dovuta alle attività agricole. Lo scopo di questo studio è quello di definire concetti e strumenti per facilitare il settore agricolo a ridurre le emissioni di gas serra. In particolare, abbiamo posto la nostra at

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14

Ferreira, Wanessa Resende. "Variabilidade de cinco espécies arbóreas da região de cerrado do Brasil Central para medidas de germinação e emergência." Universidade Federal de Uberlândia, 2007. https://repositorio.ufu.br/handle/123456789/12261.

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Basic studies of seed germination and seedling emergence assume an important role within scientific researches due to the devastation and fragmentation of the native vegetation of the Cerrado. Thus, in the present study the processes of seed germination and seedling emergency were evaluated using the linear correlations among the measurements calculated for five Cerrado species. The individual contribution for the variability of the studied species and the contribution of each species in relation to the studied group were also quantified. For this purpose, hierarchical lineal models were used

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15

Toledo, João Vitor. "Avaliação do estabelecimento de mudas de eucalipto sob déficit hídrico." Universidade Federal do Espírito Santo, 2012. http://repositorio.ufes.br/handle/10/6639.

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Made available in DSpace on 2016-12-23T14:37:44Z (GMT). No. of bitstreams: 1 Joao_Vitor_Toledo.pdf: 607615 bytes, checksum: dab692118bf86f9eb81d6ef843ae5306 (MD5) Previous issue date: 2012-01-24<br>O eucalipto é a espécie florestal de rápido crescimento mais utilizada no Brasil, sendo o seu cultivo um dos mais avançados, produtivos e competitivos do mundo. O estresse induz mudanças e respostas em todos os níveis funcionais do organismo vegetal. O déficit hídrico, portanto, causa alterações no comportamento e desenvolvimento vegetal, e dependendo do genótipo, este pode ser mais ou menos toler

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16

Borges, Kelly Cristiene de Freitas. "Maturação dos frutos na emergência de plântulas e no potencial frutífero de pitangueira-do-cerrado (Eugenia calycina Cambess)." Universidade Federal de Uberlândia, 2008. https://repositorio.ufu.br/handle/123456789/12102.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>CHAPTER II: Eugenia calycina is a fruit bearing species which is present in areas of the Savannah, whose fruit and seed morpho-physiological characteristics are rare. This being so, the objectives of the study were to quantify the influence of fruit coloration in the morphophysiological characters of fruit and seeds of the species; to determine pulp yield and to indicate the potential of the species for genetic improvement programs. In November 2006, fruits in green, orange, bright-red and dark-red colorations, 50 of each coloratio

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17

Revol, Philippe. "Caractérisation hydrodynamique des sols par infiltration bidimensionnelle axisymétrique et modélisation simplifiée de la micro-irrigation." Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10184.

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Les caracteristiques hydrodynamiques du sol jouent un role essentiel sur la repartition de l'eau en micro-irrigation, en particulier dans le cas d'une source ponctuelle. Il est donc important de pouvoir connaitre celles-ci facilement lorsqu'on s'interesse au dimensionnement et a la conduite des reseaux a la parcelle. La premiere partie de ce memoire presente une etude des principales methodes de caracterisation par infiltration axisymetrique qui sont actuellement en phase de developpement. Cette etude est effectuee a partir d'experimentations au champ et de la modelisation numerique et analyti

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18

Cooper, David Seth. "Genetics and agronomy of transient salinity in Triticum durum and T. aestivum." 2005. http://hdl.handle.net/2440/59204.

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Title page, table of contents and abstract only. The complete thesis in print form is available from the University of Adelaide Library.<br>Transient salinity in soils is characterised by high concentrations of salts in the subsoil. Durum wheat (Triticum turgidum L. Var. durum) is less tolerant of transient salinity than locally developed bread wheat (Triticum aestivum) varieties, and this results in reliable durum production being restricted to relatively unaffected soils. Field trials were conducted to assess the relative impact of transient salinity, boron toxicity and bicarbonate on crop

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19

Zahid, Muhammad Shafiq. "Lucerne performance on duplex soil under Mediterranean climate : field measurement and simulation modelling." 2009. http://hdl.handle.net/2440/56419.

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The experimental work reported in this thesis quantified the productivity of lucerne over a two-year period (2000-2001) for a Mediterranean climate at Roseworthy in South Australia (34°32′S, 138°45′E), and determined associated dynamics for water and nitrogen in duplex soil. Shoot growth of dryland lucerne was limited primarily by the pattern and amount of incident rainfall, but high temperature (30-35oC) also constrained summer production. These high summer temperatures induced greater production when irrigation was applied, but under the normally dry summer conditions high temperatures combi

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20

(5930540), Nicole A. Benally. "Soil aggregation and soil carbon measurements to assess cover crop improvements to soil health in Indiana." Thesis, 2019.

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<p>Cover crop use, especially in no-till systems, is an evolving practice to maintain or improve soil health. There are many possible indicators of soil health, but this study focuses on the analysis of soil aggregate stability, soil active carbon, and soil organic matter. Soil aggregate stability is related to water infiltration and potential for soil erosion, while active carbon serves as an indicator of a readily-available food source for microbial activity, and soil organic matter serves as a mediator for the soil physical, chemical, and biological processes. The sites include: three Purdu

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