Modeling crop yield as affected by uniformity of sprinkler irrigation system |
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| Institution: | 1. Interuniversity Department of Regional and Urban Studies and Planning (DIST), Politecnico di Torino and Università di Torino, Castello del Valentino, viale Mattioli, 39, 10125 Torino, Italy;2. ISAC-CNR, Istituto di Scienze dell’Atmosfera e del Clima, Corso Fiume 4, 10133 Torino, Italy;1. Soil and Water Management and Conservation Graduate Program, Eliseu Maciel Agronomy College, Federal University of Pelotas (UFPel), Campus Universitário, Capão do Leão, RS, Brazil;2. Water Resources Graduate Program, Technological Development Center, Federal University of Pelotas (UFPel), Gomes Carneiro St., 01, Pelotas, RS, Brazil;3. Technological Development Center, Federal University of Pelotas (UFPel), Gomes Carneiro St., 01, Pelotas, RS, Brazil;4. Regional Centre of Water Research (CREA), University of Castilla-La Mancha, Campus Universitario, 02071 Albacete, Spain;5. Engineering Department, Federal University of Lavras (UFLA), Campus Universitário, Lavras, MG, Brazil;6. Irrigation and Drainage, Low-lands Experimental Station/Center of Temperate Climate Agricultural Research, Brazilian Agricultural Research Corporation, Capão do Leão, RS, Brazil;1. Departamento de Suelo y Agua, Estación Experimental de Aula Dei (CSIC), Avda. Montañana 1005, 50059 Zaragoza, Spain;2. Unidad de Suelos y Riegos (Unidad Asociada EEAD-CSIC), Centro de Investigación y Tecnología Agroalimentaria (CITA-DGA), Avda. Montañana 930, 50059 Zaragoza, Spain;1. Department of Civil and Environmental Engineering, University of Toledo, Mail Stop 307, 2801 W. Bancroft St., Toledo, OH 43606, United States;2. Sostenipra Research Group (SGR 01412), Institute of Environmental Sciences and Technology (MDM-2015-0552), Z Building, Universitat Autònoma de Barcelona, Campus UAB, 08193 Bellaterra, Barcelona, Spain;3. Department of Chemical, Biological and Environmental Engineering, Universitat Autònoma de Barcelona, Campus UAB, 08193 Bellaterra, Barcelona, Spain |
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| Abstract: | The effect of sprinkler irrigation uniformity on crop yield is an important consideration for the design of sprinkler irrigation system. A model that relates yield response to evapotranspiration deficits at special growth stages to evaluate the impacts of uniformity on crop yield was developed from a crop water production function. The simulation results of the model showed that crop yield increased with increasing uniformity. Optimum irrigation amount and uniformity for the maximum net return were determined with the model. The optimum irrigation amount depends on irrigation uniformity and on economic factors, decreasing with the uniformity but increasing with the ratio of product price to water cost. The optimum uniformity increased with an increase of irrigation amount expressed by a ratio between gross and required irrigation amount, but approximated 90% when the ratio exceeded 0.85. Field experiments conducted to study the relationship between spatial distribution of soil moisture and sprinkler application uniformity demonstrated that the water in the soil was more uniformly distributed than that measured for the application at the soil surface. |
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