The effects of irrigation management practice on growth period and irrigation water use efficiency in paddy rice

The purpose of this research is to is to discover the relationship between the productivity of paddy rice and water efficiency of the irrigation water under different cultivation time, crop growth stage, and irrigation interval by field experiments at irrigation center in Chia-Nan Irrigation Association, the effect on paddy rice yield as the result of different saving irrigation on drought period paddy rice in different cultivation times and water management practice such as the conventional practice (CP) or the system of rice intensification (SRI). The second purpose is to analyze, with the prerequisite of paddy rice yield uninfluenced, the degree of drought tolerance, the minimum water requirement and the irrigation interval of paddy rice for reference to irrigation water management during drought period. The result of this research shows that, with the variety cultivation intervals, the water shortage during the first-season paddy rice, the growth interval, evapotranspiration and field irrigation requirement were reduced (from January 16th 2015 to February 16th 2015). When the water saving and water resource productivity for irrigation are considered at the same time, it is recommended to adjust the cultivation time for the drought in spring; planting on February 16th with the system of rice intensification (SRI) is recommended for paddy rice, through which the amounts of water can be saved for about 38.3%, and the amounts of water resource productivity is about 0.78 kg/m³. The results can be applied to irrigation water management during drought period in spring and adaptive to climate change.