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Dissertations / Theses on the topic 'Variable rate irrigation technology'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Svedin, Jeffrey David. "Characterizing the Spatial Variation of Crop Water Productivity for Variable-Rate Irrigation Management." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6878.

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Irrigated agriculture is the primary consumer of limited worldwide freshwater resources. Drought, growing world populations, and environmental demands compete with irrigation for freshwater resources"”threatening sustainable global food, fuel, and fiber production. This escalating global crisis demands that agriculture produce more food using less water. Traditional irrigation management has used technology to apply uniform irrigation rates across landscapes"”ignoring natural environmental variation. This provides inherent inefficiencies of over- or under- irrigation within individual fields.

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2

Al, Al-Baaj Aymen Ahmed Salih. "A Formal Method for Enhancing Irrigation Control of Iraqi Multi-Crops Farms." Thesis, Griffith University, 2022. http://hdl.handle.net/10072/413304.

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The specific focus of this work is conserving irrigation water in Iraq. Agriculture is the main sector that consumes fresh water globally, mostly for irrigation, and it will be the sector most affected by increasing water scarcity. Nowadays, the low-pressure sprinkler has been widely used to replace highpressure impact sprinklers in linear-move sprinkler irrigation systems due to its low operating cost and high efficiency. However, the hazard of increased surface runoff represents the biggest obstacle for low-pressure sprinkler systems. Variable-rate irrigation (VRI) techniques have been used

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3

Cugati, Sharath A. "Dynamic modeling, control, and verification for citrus variable-rate technology (VRT) fertilization." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013489.

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4

FULTON, JOHN PATRICK. "A SPATIAL MODEL FOR EVALUATING VARIABLE-RATE FERTILIZER APPLICATION ACCURACY." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_diss/248.

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The popularity of variable-rate technology (VRT) has grown. However, the limitations and errors ofthis technology are generally unknown. Therefore, a spatial data model was developed to generate "asapplied"surfaces to advance precision agricultural (PA) practices. A test methodology based on ASAEStandard S341.2 was developed to perform uniform-rate (UR) and variable-rate (VR) tests to characterizedistribution patterns testing four VRT granular applicators (two spinner spreaders and two pneumaticapplicators). Single-pass UR patterns exhibited consistent shapes for three of the applicators with

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5

Sowden, Bradley Claude. "The performance of DS-CDMA cellular systems with variable-bit-rate traffic." Thesis, University of Auckland, 2009. http://hdl.handle.net/2292/5211.

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The deployment of third generation (3G) cellular systems is resulting in a transition from cellular systems that predominantly carry constant-bit-rate (CBR) voice traffic to multi-service packet based systems that predominantly carry variable-bit-rate (VBR) traffic. With 3G DS-CDMA cellular systems there is a direct relationship between user traffic and propagation dependent performance as additional traffic causes increased system interference. This thesis investigates the impact of VBR traffic on the propagation dependent performance of DS-CDMA cellular systems that utilise frame-by-frame dy

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6

Cossette, Maximillion Kirk. "Precision Agriculture Technology Adoption and Usage in North Dakota." Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/31554.

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The world population is projected to rise, and there is a growing concern of future food availability. Precision agriculture technologies are one solution to this problem as they aim to produce more food on less land. This study examines the adoption and intensity of precision agriculture technology usage by producers in North Dakota. Data from a North Dakota State University survey was collected and analyzed using an econometric double-hurdle model. Results of the study describe which producers adopt precision agriculture technologies, which technologies complement each other, and what affect

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7

Johnstone, James Alexander. "The measurement of sporting performance using mobile physiological monitoring technology." Thesis, University of Hertfordshire, 2014. http://hdl.handle.net/2299/13527.

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Coaches are constantly seeking more ecologically valid and reliable data to improve professional sporting performance. Using unobtrusive, valid and reliable mobile physiological monitoring devices may assist in achieving this aim. For example, there is limited information regarding professional fast bowlers in cricket and understanding this role during competitive in-match scenarios rather than in simulated bowling events could enhance coaching and physical conditioning practices. The BioharnessTM is a mobile monitoring device and assesses 5 variables (Heart rate [HR], Breathing frequency [BF]

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8

Bento, Mafalda Pessoa Fragoso. "Análise da variabilidade espacial e temporal da fertilidade do solo e do estado nutricional das plantas para fertilização da vinha com apoio da Tecnologia a Taxa Variável (VRT)." Master's thesis, ISA/UL, 2018. http://hdl.handle.net/10400.5/17879.

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Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia<br>Este trabalho consiste no estudo do potencial de uso de uma tecnologia da Agricultura de Precisão – Tecnologia a Taxa Variável (VRT) - numa parcela de 1,7 ha de vinha, localizada na Tapada da Ajuda, em Lisboa. Se corretamente implementada, a VRT possibilita o aumento da eficiência do uso de recursos, do rendimento das culturas e a redução do impacto ambiental da atividade agrícola. A variabilidade espacial da parcela foi monitorizada através da recolha e análise de amostras de solo e de folhas para 80 pontos da vinha e ext

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9

Weiss, Austin M. "REMOVING VEHICLE SPEED FROM APPARENT WIND VELOCITY." UKnowledge, 2019. https://uknowledge.uky.edu/bae_etds/67.

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Variable-rate technologies for sprayer applications stand to increase efficacy by ensuring the right amount of chemical is applied at the right location. However, external environmental factors such as droplet drift caused by variable ambient condition, are not yet integrated into modern sprayer systems. Real-time wind velocity measurements can be used to control droplet spectra for reducing spray drift by actuating a variable-orifice nozzle. This work aimed to develop data processing methods needed to filter noise and remove vehicle speed from wind velocity measurements collected with an ultr

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10

Maurer, Jacob Lafe. "The development of a conceptual benchmarking tool representing big data and agricultural technology adoption on the farm." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19071.

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Master of Agribusiness<br>Department of Agricultural Economics<br>Gregory Ibendahl<br>One of the latest buzzes amongst agriculture is the storage and analysis of “Big Data.” There are a number of questions surrounding the quality, quantity, and capacity of big data to form real-world decisions based upon past information. Much like the teachings of history, the storybook that big data can reveal about a grower’s operation may hold the answers to the question of: “what is necessary to increase food production which will be required to feed an ever-growing world?” With the increase in interest i

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11

Fickenscher, Tyrell. "Precision agriculture adoption by growers in South Central Nebraska." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/13777.

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Master of Agribusiness<br>Department of Agricultural Economics<br>Kevin Dhuyvetter<br>This thesis was commissioned by Cooperative Producers, Inc. (CPI) of Hastings, Nebraska in order to better understand the preferences and uses of precision agriculture by customers within the company’s trade territory. With the rapid increase of precision agriculture (hardware, software, services, etc.) it is necessary to get a better understanding of what drives growers to adopt and implement precision agriculture practices. A paper survey was sent out in CPI’s monthly statements to patrons that also inclu

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12

Pereira, Flávio José de Sousa [UNESP]. "Sistemas de comutação de pontas na barra de pulverização para ajuste do tamanho de gotas às condiçoes climáticas e aplicação em taxas variáveis." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/101678.

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Made available in DSpace on 2014-06-11T19:31:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-12-14Bitstream added on 2014-06-13T19:20:42Z : No. of bitstreams: 1 pereira_fjs_dr_botfca.pdf: 1185742 bytes, checksum: 29392c93db0c4947a9ef1eda0e2f548e (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Universidade Estadual Paulista (UNESP)<br>A tecnologia de aplicação de produtos fitossanitários não tem sido realizada de maneira adequada por grande parte dos agricultores, causando grandes

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13

Colaço, André Freitas. "Mobile terrestrial laser scanner for site-specific management in orange crop." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-23012017-151317/.

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Sensors based on LiDAR (Light Detection and Ranging) technology have the potential to provide accurate 3D models of the trees retrieving information such as canopy volume and height. This information can be used for diagnostics and prescriptions of fertilizers and plant protection products on a site-specific basis. This research aimed to investigate the use of LiDAR sensors in orange crops. Orange is one of the most important tree crop in Brazil. So far, research have developed and tested LiDAR based systems for several tree crops. However, usually individual trees or small field plots have be

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14

Pereira, Flávio José de Sousa 1973. "Sistemas de comutação de pontas na barra de pulverização para ajuste do tamanho de gotas às condiçoes climáticas e aplicação em taxas variáveis /." Botucatu : [s.n.], 2006. http://hdl.handle.net/11449/101678.

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Orientador: Ulisses Rocha Antuniassi<br>Banca: Carlos Gilberto Raetano<br>Banca: Kléber Pereira Lanças<br>Banca: Antonio Gabriel Filho<br>Banca: Marco Antonio Gandolfo<br>Resumo: A tecnologia de aplicação de produtos fitossanitários não tem sido realizada de maneira adequada por grande parte dos agricultores, causando grandes desperdícios do produto e contaminação ambiental. O tamanho único de gotas durante a pulverização ao longo do dia, independentemente das condições climáticas, é um fator que contribui para a baixa eficiência, causando desperdícios por deriva e ineficiência na cobertura do

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15

Abuhaiba, Mohammad. "Mathematical Modeling and Analysis of a Variable Displacement Hydraulic Bent Axis Pump Linked to High Pressure and Low Pressure Accumulators." Connect to full text in OhioLINK ETD Center, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1240528916.

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Dissertation (Ph.D.)--University of Toledo, 2009.<br>Typescript. "Submitted as partial fulfillment of the requirements for the Doctor of Philosophy degree in Mechanical Engineering." Bibliography: leaves 203-209.

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16

Acosta, José Alan de Almeida. "Dinâmica do nitrogênio sob sistema plantio direto e parâmetros para o manejo da adubação nitrogenada no milho." Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/3311.

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Among the several essential nutrients in the nutrition of the maize, without a doubt, the nitrogen (N) is one of the most important. However, most of the time, the amount naturally available in the soil is insufficient to supply the demand for N, turning the complementation with nitrogen fertilization to maize essential for obtaining of expressive yields, besides to represent a significant part of the production costs. In that way, the rational use of nitrogen fertilization associated to the best use of the N released by residues cultural predecessors is an aspect of extreme importance for the

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17

Escolà, i. Agustí Alexandre. "Mètode de dosificació variable en temps real per a l'aplicació de productes fitosanitaris en fructicultura de precisió." Doctoral thesis, Universitat de Lleida, 2010. http://hdl.handle.net/10803/8158.

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L'objectiu general d'aquesta tesi és desenvolupar un mètode dinàmic de dosificació de productes fitosanitaris que permeti incrementar significativament l'eficiència d'aplicació, reduir les pèrdues i disminuir la variabilitat de les deposicions sense disminuir l'eficàcia de les aplicacions en plantacions fructícoles. El mètode proposat es basa en la caracterització electrònica de les dimensions de la capçada i en dosificar el producte fitosanitari de forma variable, contínua i en temps real. Aquest objectiu s'ha establert a partir de la formulació de tres hipòtesis de partida sustentades en la

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18

Hendriks, Joseph. "An analysis of precision agriculture in the South African summer grain producing areas / Hendriks J." Thesis, North-West University, 2011. http://hdl.handle.net/10394/7318.

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Both globally and locally, agriculture faces ever increasing challenges such as high input costs, strict environmental laws, decrease in land for cultivation and an increase in demand due to the growing global population. Profitability and sustainability requires more effective production systems. Precision agriculture is identified as such a system and is built upon a system approach that aims to restructure the total system of agriculture towards low input, high efficiency and sustainable agriculture. The aim of this study was to analyse the state of precision agriculture in the summer grain

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19

Murray, Robert Ian. "Variable rate application technology in the New Zealand aerial topdressing industry." 2007. http://hdl.handle.net/10179/1399.

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Greater use of technology to assist aerial application of fertiliser will be of benefit to the topdressing industry and farmers. Benefits arise through automating the fertiliser flow control system; reducing off target fertiliser application, and managing fertiliser inputs based on the potential outputs of the farmland; thus increasing the profitability of hill country farming systems. A case for technology assisted application is developed by investigating the field performance of conventional and enhanced flow control systems and the effect of variable rate application on hill country pastur

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20

Bennur, Praveen J. "Response time evaluation of real-time sensor based variable rate technology equipment." 2009. http://digital.library.okstate.edu/etd/Bennur_okstate_0664M_10455.pdf.

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21

Sayde, Chadi. "Improving soil water determination in spatially variable field using fiber optic technology and Bayesian decision theory." Thesis, 2012. http://hdl.handle.net/1957/28778.

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Achieving and maintaining sustainability in irrigated agriculture production in the era of rapidly increasing stress on our natural resources require, among other essential actions, optimum control and management of the applied water. Thus, a significant upgrade of the currently available soil water monitoring technologies is needed. The primary goal of this work was to reduce the uncertainties of spatially variable soil water in the field. Two approaches are suggested: 1) The Bayesian decision model that implicitly accounts for spatial variability at minimal cost based on limited field data,

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22

ABBAS, ASIF. "IMPACT OF VARIABLE RATE SPLIT FERTILIZATION ON CROP PRODUCTION AND ENVIRONMENTAL CONTAMINATION IN WILD BLUEBERRY." Thesis, 2014. http://hdl.handle.net/10222/49101.

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The heavy rainfall, gentle to severe topography with high proportion of bare spots, and weed patches emphasize the need of variable rate split (VRS) fertilization in wild blueberry. Two commercial fields were selected in central Nova Scotia to evaluate the impact of VRS fertilization on ammonia volatilization, subsurface water quality, and crop productivity. Management zones were delineated based on slope variability, and different fertilizer rates were applied using global positioning system (GPS) guided prescription map. Ammonia huts were used to quantify the ammonia volatilization losses, w

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23

Farooque, Aitazaz Jr. "Effect of Soil Variability on Wild Blueberry Fruit Yield." 2010. http://hdl.handle.net/10222/13177.

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Two wild blueberry fields were selected in central Nova Scotia, to characterize and quantify the spatial pattern of variability in soil properties, leaf nutrients and fruit yield, identification of yield influencing soil properties, and to develop management zones for site-specific fertilization. A combination of classical statistics, geostatistical analysis and mapping in Arc GIS 9.3 indicated substantial variation within field. The stepwise regression suggested that the soil EC, horizontal co-planar geometry (HCP), inorganic nitrogen and moisture content were major yield influencing factors.

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24

Penedos, Pedro Pais. "Precision Agriculture Using Unmanned Aerial Systems: Mapping Vigor’s Spatial Variability On Low Density Agricultures Using a Canopy Pixel Classification And Interpolation Model." Master's thesis, 2018. http://hdl.handle.net/10362/33277.

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Dissertation submitted in partial fulfilment of the requirements for the degree of Master of Science in Geospatial Technologies<br>It is becoming more present in agriculture’s practices the use of Unmanned Aerial Systems with sensors capable of capturing light, in the visible and in longer wavelengths of the electromagnetic spectrum once reflected on the field. These sensors have been used to perform Remote Sensing also in other knowledge fields, describing phenomenon without the risk, cost and the time consuming processes associated with in site samples collection and analysis by a technician

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