Comparison of Optimized Some Water Use Efficiency in Paddy Fields of Rasht

آب و خاک

Article 22, Volume 26, Issue 5, November 2012, Pages 1277-1288   

Document Type: Research Article

DOI: 10.22067/jsw.v1391i0.17070

Authors

M. Aghajani^* ; Maryam Navabian

Abstract

Water for rice cultivation is one of the main inputs. The new administration of irrigated rice is increase water efficiency and water conservation in the paddy fields. In this research, for optimization of intermittent irrigation management in proportion to water requirement of different stages of rice growth was present an optimization- simulation model to maximize irrigation water, transpiration and evapotranspiration productivity Indexes. Irrigation water depth in stages of tiller, vegetative, maturity, harvest and irrigation intervals were selected as decided values in optimization model. Simulation of plant growth stages, using the hydrological model SWAP and genetic algorithm was used to solve the optimization model to maximize agricultural productivity. Finally, the optimum amount of irrigation water productivity, transpiration and evaporation - transpiration were obtained 1.60, 2.90 and 1.33(kg/m3) respectively. Results showed, irrigation water productivity index has more harmonize with Sefidroud irrigation network. Also the index is user-friendly in applying and calculating. So according to maximizing of water productivity index irrigation depth was recommended 51, 29, 39 and 11 mm respectively in stages of tiller, vegetative, maturity, harvest and and 8 days period of irrigation intervals to improve water productivity index in Hashemi variety in Rasht. Optimization results showed optimal intermittent irrigation is successive compared with flood irrigation in rice.

Keywords

Genetic algorithm; Rice; Optimization model; SWAP model; Intermittent irrigation management