Nitrogen Management Technology of Rice

In this test,with optimized nutrient management of rice as the basis,all high yield culture techniques were used synthetically to make its yield attain above 10 t/hm2.The nutritive absorption rule,dry matter accumulation and their relationship of high-yield and good-quality rice during the growth period were studied to reveal the influence mechanism of control in the earlier and later growing stage on growth and yield of rice,and build the mode chart of precise and quantitative cultivation of high yield in the cold region.The results showed that with the increase of nitrogen rate,tiller number,plant height,dry matter accumulation amount,leaf area,chlorophyll content,ultimate yield and incidence of rice were increasing,but nitrogen utilization ratio decreased.Under the same nitrogen amount,there were some difference in biological character and yield of rice,and changed slightly,nitrogen fertilization method had an impact on biological character and yield of rice,and the effect of nitrogen rate of 4:3:1:2 was better than that of 4.5:2:1.5:2.