Effects of different application rates of side deep fertilization on yield and fertilizer use efficiency of rice in cold region

In order to ensure the effect of rice side deep fertilization in the process of rice cultivation in cold area，and the best effect of section saving and fertilizer saving，the experiment was carried out with Longjing 31 rice varieties as experimental materials，effects of fertilizer dosages on yield and fertilizer use efficiency of rice in cold region were studied. The results showed that the yield of rice was increased by the method of side depth fertilization， and the yield per panicle was higher than that of the spike number per panicle，seed setting rate and grain weight were higher，so the yield was 9.97 t·hm2. Fertilizer utilization rate showed that the nitrogen production efficiency，nitrogen dry matter production effiiency and nitrogen fertilizer partial productivity were improved after reducing the yield， and the nitrogen use efficiency was the highest after 5% reduction，ndicating that the reduction of 5% -10% not only reduced the input of fertilizer，increased the yield of rice，but also improved the efficiency of fertilizer use，to achieve the best level of fertilization.