科研之友
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摘要
Surface irrigation, including border, basin and furrow irrigation is used more than pressurized irrigation due to the low cost and energy requirement. However, more precise selection of design parameters for efficient design of surface irrigation is required for higher irrigation efficiency, and the accurate prediction of the infiltration rate is of prime importance. Field data sets for irrigation events during sugar beet growing season were collected for characterizing infiltration properties in alternate, fixed and conventional furrow irrigation (AFI, FFI and CFI, respectively), carried out on a clay loam soil in Karaj, Iran. The treatment was applied in two consecutive years (2013 and 2014) as randomized complete block design with three replications. Therefore, this research was conducted to determine the parameters of Lewis-Kostiakov infiltration model based on the data obtained in advancing stage and two-pointed method. Less runoff losses and large infiltration rate observed in AFI as compared to CFI due to increased lateral water movement to non-irrigation furrow. Having different infiltration characteristics in AFI, design will be different from CFI in the same field. Results indicated that the final soil infiltration was 1.6*10(-4) m(3)/m/min at the beginning of the growing season and decreased in CFI, FFI and AFI management system by 44, 38 and 30% respectively, at the end of growing season. The amount of 'a' coefficient variations in Kostiakov-Lewis model, showed a decreasing trend during the growing season, but the 'k' coefficient had an incremental trend in CFI, FFI and AFI irrigation management system. AFI had greater infiltration rate than FFI, the steady infiltration rate in AFI and FFI was higher than CFI. Consequently, alternate furrow irrigation management with reduced drainage achieved maximum water use efficiency (WUE).
- 出版日期2018
