The invention belongs to the technical field of rice planting, and relates to a method for improving the
nitrogen absorption and
utilization rate of first-season-regeneration-season rice, which comprises the following steps: deeply ploughing soil, applying a specific
soil conditioner, optimizing the
nitrogen fertilizer ratio and the fertilization
time sequence, and matching with precise
intermittent irrigation water management to form a systematic cultivation
system. The method effectively solves the problems of low
utilization rate, soil hardening, environmental
pollution and the like caused by
nitrogen volatilization, leaching and
denitrification in the traditional double
cropping rice cultivation, can obviously enhance the nitrogen conservation and fixation capability of the soil, ensures that nitrogen supply is accurately matched with the requirements of the rice in each growth
critical period, and improves the yield of the rice. Meanwhile, nitrogen loss is inhibited through a dry-wet alternate
irrigation mode, the
nitrogen absorption and utilization efficiency of the rice is greatly improved on the premise that the
nitrogen fertilizer consumption is not increased, balanced growth and yield increase of rice in the first season and the regeneration season are promoted, the
ecological environment of soil is improved, and cost saving, efficiency increasing and
sustainable development of rice production are achieved.