Effect of Different Nitrogen Fertilizer Base Dressing and Topdressing Ratio on Yield of Soil Moisture Preservation and Dry Direct Seeding Rice

An experiment on the effect of different nitrogen fertilizer base dressing and topdressing ratio on yield of soil moisture preservation and dry direct seeding rice was conducted.The result shows that under the condition of nitrogen fertilizer(pure N) application amount of 240 kg/hm2,the optimal base dressing and topdressing ratio for soil moisture preservation and dry direct seeding rice is 43.6:56.4,the theoretical yield of rice is 10 012.2 kg/hm2 and nitrogen fertilizer utilization rate is 44.5%.