Study On The Effect Of Different Nitrogen Application Rates On The Yield,Quality And Population Quality Of Super Hybrid Rice In Southern Henan

Xinyang is the main area of rice production in Southern Henan.The Super Hybrid Rice Liangyou peijiu,Y Liangyou 1,Y Liangyou 2,Y Liangyou 900,Chaoyou 1000 were used as materials,and the quantitative cultivation techniques were adopted to study the effect on the yield and population quality of mechanical transplanting Super Hybrid Ric in Southern Henan.To reveal the physiological basis of mechanical transplanting Super Hybrid Rice,this study investigated the source-sink relationship under five kinds of nitrogen application(0,10,14,20,26 and 30 kg/667m2)manners with different target yields(700,800,900,1000 and 1067 kg/667m2).This study would provide scientific basis on high yield cultivation in the Southern Henan.The main results are as follows:1.The effects of different nitrogen application rates on the photosynthetic capacity and nitrogen content of Super Hybrid Rice.With the increase of nitrogen,the nitrogen content of rice increased,LAI and SPAD value presented an increasing trend firstly and then decrease slowly.The leaf area index was highest under the N26 treatment,the SPAD was highest under the N20 treatment,nitrogen content and SPAD of Chaoyou 1000 and Y Liangyou 900 were higher than Liangyou peijiu,Y Liangyou 1,Y Liangyou 2.The suitable N adaption was different in different varieties,the suitable N adaption of Chaoyou1000 and Y liangyou900 were higher than Liangyou peijiu,Y Liangyou 1,Y Liangyou 2.LAI,SPAD value and nitrogen content affected the intensity of photosynthesis and the assimilating suppliment of "source" directly,and provided material basis for the rice yield.2.The effects of different nitrogen application rates on the dry matter accumulation of Super Hybrid Rice.With the increase of nitrogen application,the change in the amount of dry matter presented the trend as an downward opening parabola,under The treatment among N14-N20 the dry matter accumulation is highest,The dry matter of five Super Hybrid Rice was different significintly.The suitable N application of Chaoyou 1000 and Y Liangyou 900 were higher than Liangyou peijiu,Y Liangyou 1,Y Liangyou 2.The amount of dry matter and nitrogen content had significant positive correlation.3.The effects of different nitrogen application rates on yield and yield's contents of Super Hybrid Rice.With the increase of N appliciation,the yield of five super hybrid rice presented the trend as an opening downward quadratic,Y Liangyou 900 was overall highest,under N14 treatment its yield could reach 843.25 kg / 667m2.When the nitrogenapplication wass low,with the increase of nitrogen application level,panicles number and spikelets per panicle increased gradually,the economic coefficient,seed setting percentange and 1000-grain weight decreased in various degrees.when nitrogen appliciation rate continued to increase,panicles number,spikelets per panicle tended to decrease,the increase of yield were not significant The economic coefficient and the theoretical yield of Y Liangyou 900 and Chaoyou 1000 were higher than other varieties significantly.The dry matter in heading stage had a very significant positive correlation with yield,it is possible to increase production by regulating the biomass in heading stage.4.The effects of different nitrogen application rates on the quality of Super Hybrid Rice.Nitrogen application had no significant effect on the quality of rice.Under the treatment of N26,N14 and N30,the chalky rice rate,half-baked rice rate,and yellow-colored rice rate were lower,The milled rice yield and head rice yield were higher.The impact of nitrogen application on chalkiness were different in varieties.For Y liangyou900,Small broken rice rate was lower,half-baked rice rate was higher,the chalky rice rate and milled rice rate are higher,the comprehensive quality was higher than other varieties.5.The effects of different nitrogen application rates on the lodging resistance of Super Hybrid Rice.With the increase of nitrogen appliciation rate,lodging index showed a gradual upward trend.Lodging index were higher under the treatment among N20~N30.The lodging capacity between varieties was significint different.The lodging index of Y liangyou 900 and Chaoyou 1000 was lower than other varities,therefore,they had a better lodging resistance.