Irrigation amounts and timing of irrigation termination affecting mungbean on a silty clay loam soil
1997
Wanchai Thanomsub | Kanokporn Maolanont | Somchai Boonpradub (Department of Agriculture, Bangkok (Thailand). Chai Nat Field Crops Research Centre)
Responses of a mungbean cultivar, Chai Nat 36, to irrigation level and timing of irrigation termination were examined on a silty clay loam soil at Chai Nat Field Crop Research Centre in 1995 and 1996. The number of irrigation applications were 2-5 and 2-4 for the 1995 and 1996 experiments respectively, and total amounts of water were 12-216 and 12-192 mm, depending upon irrigation rates and timing of last irrigation. There were no interactions between irrigation amounts and timing of irrigation termination in both seasons. Leaf area index (LAI), leaf area duration (LAD) and crop growth rate (CGR) increased with increasing irrigation rates up to the highest rate, IW/E (ratio of irrigation water to evaporation) 0.8. Irrigation applied through R5 gave the greatest LAI, LAD and CGR, whereas irrigation terminated at V4 showed the lowest. Seed yields increased up to 53 percent with increasing irrigation rates from IW/E 0.1 to 0.8. Irrigation terminated at V4 reduced seed yields 18 and 44 percent as compared to irrigation terminated at R1 and R5, respectively. Reduction in the number of pods/plant and seeds/pod was the major factor causing a smaller yield of lower irrigation rated and irrigation terminated at early growth stages.
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