湘中中稻水肥控灌模式及试验研究OA

This study aimed to optimize the irrigation mode of mid-season rice in central Hunan and improve the efficiency of water and fertilizer utilization.The long-term rainfall series in central Hunan was analyzed using the frequency method.Utilizing the Penman-Monteith method,single crop coefficient method and water balance method as the theoretical foundation,the net irrigation water requirement was determined incorporating seasonal rainfall during the growth period of mid-season rice.A questionnaire on water management for fertilizer and pesticide application in the field was collected,and the water requirements for physiological and ecological processes and efficient utilization of fertilizer and pesticide during the cultivation of mid-season rice were statistically summarized.Five irrigation modes,namely flooding,wetting,deep water storage,water control and semi-dry,were optimized,and field experiments on water-fertilizer controlled irrigation were conducted.The field experiment results showed that water control irrigation was the best mode for mid-season rice in central Hunan,with a net irrigation amount of about 284 mm,a fertilizer application level of 142 kg/hm²,a water productivity of 1.50 kg/m³ and a partial factor productivity of fertilizer of 55.6 kg/kg.