Effects Of Nitrogen Fertilizer Density On High Yield And Good Quality Of Japonica Rice In North China

In order to meet people’s need for continuous growth of rice,the yield level of rice in China,especially in the north,has been continuously improved,but the development of quality improvement is slow.In order to find the balance between yield and quality,to ensure a higher yield level and improve quality.This study four stable quality of japonica rice varieties in north japonica 3,liao 939 and 401,salt japonica japonica Shen Nong 15256 as material,with different cultivation patterns(nitrogen and density)for processing,to the rice yield,yield components and quality traits were determined,and analyzes the different cultivation mode between the stem tillers dynamics,SPAD value,leaf area index and other differences,aims to reveal the different cultivation patterns on japonica rice yield and quality traits.The research results are as follows:1.Under different cultivation modes,liao jing 401 is in N2D1M1(pure nitrogen 225kg;30 cm * 20 cm;Under the fertilization mode of 5-2-3),the yield reached the maximum,and the increase was mainly reflected in the number of grains per panicle.The yield of shen nong 15256 was N1D1M1(pure nitrogen 135kg/hm2;30 cm * 20 cm;The fertilization mode was 5-2-3),and the yield increase was mainly due to the synergistic effect of grain number per panicle and seed setting rate.2.Under different cultivation modes,liao jing 401 and shen nong 15256 moved N1D1M2(pure nitrogen 135kg/hm2;30 cm * 20 cm;When the fertilization mode is 4-1-2-3),the quality is the best,in which the eating taste value and the whole rice rate are higher,and the chalky grain rate and chalky degree are lower.3.By analyzing the dynamic change of tiller,it is found that shen nong 15256 has more tiller Numbers and its tiller capacity is larger than that of liao jing 401,but the latter reaches the tiller peak at first.Under the high-density and low-density cultivation mode,the tiller number of shennong increased significantly after tiller fertilizer was applied.Under the condition of low density per ear fertilizer,tiller number under high and low fertilizer treatment decreased significantly after 60 days of transplanting,that is,after applying per ear grain fertilizer.SPAD values were analyzed,and it was found that under the N1D1M2 treatment with low nitrogen and low density panicle fertilizer,the SPAD values of liao jing 401 were significantly higher than those of other treatments at the sterility stage.It was found that the leaf area index of shen nong 15256 decreased significantly in the grouting stage,while the leaf area index of shen nong 15256 was relatively high in the heading stage.Therefore,according to their yield and quality,under the condition of low nitrogen and low density panicle fertilizer moving forward to N1D1M2,the quality of liao jing 401 is high,and the yield reaches the highest under the condition of high nitrogen and low density panicle fertilizer N2D1M1.Shen nong 15256 had the highest yield under the condition of N1D1M1 and the best quality under the condition of N1D1M2.In general,the effect of transplanting density on yield and quality was not significant,and the effect of nitrogen application and operation mode on yield and quality was significant.Under the condition of high nitrogen and low density ear fertilizer(N2D1M1),the quality of ear fertilizer reached the best under the condition of high nitrogen and low density ear fertilizer(N1D1M2).In order to provide some basis for high yield and high quality cultivation technology in liaoning.