Analysis of Center Pivot Irrigation Systems Operating in a Humid-Area Environment

Johnson, Gregory C.; Rochester, Eugene W.; Hatch, L. Upton; Curtis, Larry M.; Yoo, K.

doi:10.13031/2013.30628

Cited by 10 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Martin et al (1985) evaluated several irrigation strategies for corn in humid regions using the CERES-Maize crop model. Johnson et al (1987) analyzed the economics of center pivot irrigation systems in southeastern U.S. peanut fields. Although these older studies showed limited economic return for irrigation in humid areas, recent technological progress in precision agriculture may allow irrigation in Iowa and other humid areas to be economically feasible.…”

mentioning

confidence: 99%

Simulating the effects of spatially variable irrigation on corn yields, costs, and revenue in Iowa

DeJonge

Kaleita

Thorp

2007

Agricultural Water Management

View full text Add to dashboard Cite

mentioning

confidence: 99%

Simulating the effects of spatially variable irrigation on corn yields, costs, and revenue in Iowa

DeJonge

Kaleita

Thorp

2007

Agricultural Water Management

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Simulation of Spatially Variable Precision Irrigation and Its Effects On Corn Growth Using CERES-Maize

DeJonge¹,

Kaleita²

2006

2006 Portland, Oregon, July 9-12, 2006

View full text Add to dashboard Cite

Few studies have been done considering the possibility of irrigation systems in Iowa or other humid regions. Recent technological progress in precision agriculture may allow irrigation in these areas to become more economically feasible. Crop models have emerged as a method to evaluate different crop management practices such as irrigation without costly and time-consuming onsite experiments. In this study, the CERES-Maize crop model was used in conjunction with APOLLO, a shell program developed at Iowa State University, to evaluate potential improved yield in a central Iowa cornfield on a spatially and temporally variable basis. Five years of historical yield and weather data were used to calibrate the model over 100 spatially variable grids for nonirrigated conditions in the 20.25 ha field. This calibrated model then used 28 years of historical weather data to simulate three irrigation scenarios: no irrigation, scheduled uniform irrigation, and precision irrigation. 30 mm irrigations were applied when the percent of available soil water fell below 50 percent. Irrigation improved yield by at least 1000 kg ha-1 in half of the years simulated, and also showed to have less variability both spatially and temporally. Precision irrigation showed slightly higher yields than scheduled uniform irrigation. Spatial variability of yield was most influence by topography, with the largest improvements occurring on steep sideslopes and hilltops. Assuming use of a center pivot irrigation system, irrigation showed economic returns in only three of the 28 years included in the study. High capital costs were the leading restrictor of economic feasibility.

show abstract

“…Essas interpolações possibilitam simular, em computador, variações na distribuição de água dos aspersores em função de alterações nas condições climáticas, do desgaste dos bocais ou de alterações na pressão de serviço dos aspersores, induzidas por perda de carga e por variações topográficas do terreno. Desta forma, a partir de um limitado número de ensaios de aspersores, podemos gerar os dados de entrada requeridos por aplicativos computacionais, que simulam a distribuição de água tanto de sistemas de irrigação por aspersão convencional (ALLEN, 1992, OLIPHANT, 1993, como autopropelido (ROCHESTER, 1983e COLOMBO, 1991 e pivô central (JOHNSON et al, 1987e OMARY & SUMNER, 2001. Louie & Selker (2000) referem-se a um procedimento de interpolação do perfil radial de aplicação de água, no qual os pares de valores de distância ao aspersor e intensidade de precipitação são multiplicados pela razão entre a vazão do aspersor na condição a ser interpolada e a vazão na condição na qual o perfil foi determinado.…”

Section: Introductionunclassified

Caracterização Técnica Do Aspersor Plona-Rl300

Prado¹,

Colombo²

2005

R_I

View full text Add to dashboard Cite

CARACTERIZAÇÃO TÉCNICA DO ASPERSOR PLONA-RL300 Giuliani do Prado; Alberto ColomboDepartamento do Engenharia, Universidade Federal de Lavras, Caixa Postal 37, CEP 37200-000, Lavras – MG, a6gp@cav.udesc.br 1 RESUMO O trabalho teve como objetivo apresentar as características operacionais do aspersor, do tipo canhão hidráulico com mecanismo setorial de reversão lenta, da marca PLONA, modelo RL300, que foram determinadas no Setor de Hidráulica da Universidade Federal de Lavras, em Lavras - MG. Foram realizadas quarenta e cinco determinações de vazão, raio de alcance e perfil radial de distribuição de água, abrangendo nove diferentes diâmetros do bocal principal (22, 24, 26, 28, 30, 32, 34, 36 e 38 mm) e cinco valores de pressões de serviço, variando deste 294 até 686 kPa, em intervalos de 98 kPa. Os valores de vazão (Q em m3 h-1) e raio de alcance (R em m) observados nos ensaios foram relacionados ao diâmetro do bocal principal (b em mm) e à pressão de serviço (P em kPa) através das equações: Q = 0,00145 b2,189 P0,504 (r2 = 0,9963) e R = 0,553 b0,533 P0,436 (r2 = 0,9611). Os perfis radiais de aplicação de água foram adimensionalizados e submetidos à análise de agrupamento (método “K-Means”) que indicou a ocorrência de perfis radiais com três formatos geométricos distintos e também caracterizou as condições operacionais do aspersor (bocal versus pressão), que determinam a ocorrência de cada umas das três formas geométricas distintas do perfil radial de aplicação de água. UNITERMOS: aspersores, perfil radial de aplicação, teste de uniformidade. PRADO, G.; COLOMBO, A.TECHINAL CHARACTERIZATION OF THE SPRINKLER PLONA-RL300 2 ABSTRACT This work aimed to present performance characteristics of the PLONA-RL300 slow reversion gun-type sprinkler that were evaluated at the Hydraulics Section of the Universidade Federal de Lavras, in Lavras - MG, Brazil. Sprinkler flow rate, reach radius and water distribution curve were evaluated at forty-five different combinations of sprinkler nozzle diameter (22, 24, 26,28, 30, 32, 34, 36, and 38 mm) and operating pressure (from 294 kPa up to 686 kPa at regular 98 kPa intervals). Values of sprinkler flow rate (Q in m3 h-1) and sprinkler reach radius (R in m), observed at different combinations of nozzle size (b in mm) and operating pressure (P in kPa), were used to fit the following equations: Q = 0.00145 b2.189 P0.504 (r2 = 0.9963) and R = 0.553 b0.533 P0.436 (r2 = 0.9611). Water distribution curves were normalized and submitted to clustering analysis (K-Means algorithm). Based on the clustering analysis results, we were able to identify the occurrence of normalized distribution curves with three different geometric shapes and also to identify sprinkler operational conditions associated to each one of the three normalized distribution curve geometric shapes. KEYWORDS: rotating sprinkler, water distribution curve, uniformity test

show abstract

Analysis of Center Pivot Irrigation Systems Operating in a Humid-Area Environment

Cited by 10 publications

References 0 publications

Simulating the effects of spatially variable irrigation on corn yields, costs, and revenue in Iowa

Simulating the effects of spatially variable irrigation on corn yields, costs, and revenue in Iowa

Simulation of Spatially Variable Precision Irrigation and Its Effects On Corn Growth Using CERES-Maize

Caracterização Técnica Do Aspersor Plona-Rl300

Contact Info

Product

Resources

About