Effects of irrigation model and nitrogen fertilization on rice evapotranspiration and yield

The effects of irrigation model and nitrogen(N)fertilization on rice evapotranspiration and yield were studied in an experiment of pool culture within rain-proof shelter.Results showed that irrigation model and nitrogen fertilization significantly influenced on rice stage water consumption,water requirement intensity and water use efficiency,yield and yield components.Compared with the conventional irrigation,rice water consumption,water requirement intensity and valid panicle number decreased,and while water use efficiency,grain number per spike and seed setting rate increased under control irrigation.With the increment of N application rates,rice water consumption,water requirement intensity,effect panicle number and grain number per spike increased,while setting-seed rate and 1 000-grain weight decreased.However,yield and water use efficiency were highest at 180 kg·hm-2 of N applied.We concluded that control irrigation model combined with suitable N application rate(180 kg·hm-2)could benefit for rice production by reducing cost and gaining high yield.