Study On Leaf Quality And Nitrogen Regulation Of Super Hybrid Rice In Continuous Yield

Super Hybrid Rice has the advantages of high yield,multiple resistance and wide adaptability,with the gradual success of super hybrid rice breeding and the popularization of some super high-yielding rice varieties,Super hybrid rice has been paid more and more attention for its "big storehouse","strong source" and "fluent".since 2000,the super hybrid rice Liangyoupeijiu reached the first target of 700kg/667m2,and to2013,the average grain yield of Y Liangyou 900 has reached 988.1kg/667m2,and high yield combinations signs Xiang liangyou 900 reach 1067.34kg/667m2 in 2015.,super hybrid rice production potential continued to increase.But the mechanism of continuous yield increase of super hybrid rice is not clear.Therefore,this study selected five representative varieties of super hybrid rice with different yield potentials,and six nitrogen application levels(without applying nitrogen as a control).The split-zone test was used to study the quality of leaf resources for the continuous yield increase of super hybrid rice.And its nitrogen response characteristics.provide a theoretical basis for the breeding and cultivation of super hybrid rice.The research results show that:1.With the increase of yield potential,the number of effective panicles in the five-stage super hybrid rice continued to decrease,while spikelets per panicle and harvest yield continued to increase,and the 1000-grain weight and seed setting rate increased first and then decreased.This indicates that super hybrid rice yield potential of increasing mainly depends on the increase of the number of grains per panicle and the setting rate is the main reason to limit the high yield of Xiang Liangyou900.With the increase of N application,spikelets per panicle and harvest yield and the1000-grain weight continued to increase,panicle and seed setting rate change trend,on the other hand,the former is characterized by rising trend.2.there was a significant or even significant relationship between basal leaves and yield,especially CAT activity and POD activity at heading stage and mature stage.3.With different yield potential of super hybrid rice,leaf area index,dry matter accumulation,leaf area ratio,and photosynthetic potential,is early Liang youpei9 and Y Liang you1 higher than that of other three varieties,but later it compared to theother three varieties of small,at the same time,from jointing to heading during the period of population growth is less than the other three varieties,The late three Super hybrid Rice has strong "source" supply ability in the later stage of reproduction,which is also one of the reasons that the yield potential of super hybrid rice is increasing continuously,and its harvest yield increases with the increase of yield potential.4.With different yield potential of super hybrid rice,Liang youpei jiu and Y liangyou1,compared to the other three varieties,has compact plant type,so in the late period of the mean leaf angle is too large,resulting in the occurrence of light leakage.At the same time,in middle and late growth stage,The TCRP of Liang youpei jiu,Y liangyou 1 and Xiang Liangyou900 are too large to cause that by the increase of yield potential of the five super hybrid rice,the harvest yield do not increase.Besides,the influence of population extinction coefficient on the population structure of the five stage super hybrid rice is mainly affected by the grain filling stage and the upper part of the population.The better the value is,the higher the yield is.5.The air-base temperature difference of super hybrid rice with different yield potential mainly has a significant positive correlation with the actual yield in the early stage of grouting,and the temperature difference between day and night is mainly in7 D and 35 D after Anthesis,which has a significant negative correlation.