Study On Growth Dynamics And Yield Traits Of Late Season Direct Seeding Some Hybrid Rice Varieties Suitable For Planting In Sichuan Basin

In this experiment,50 hybrid rice varieties suitable for planting in Sichuan basin were used for delayed seeding after wheat.The characters such as growth dynamics,yield,effective ear number,grain number per ear,grain number per ear,seed setting rate,1000 grain weight,harvest index and ear rate were investigated.The results of correlation analysis,path analysis and correlation analysis were obtained as follows:1.Under the condition of after wheat delayed direct seeding,all varieties could complete the normal growth process and the whole growth period was 129-142d.The highest tiller number and effective accumulated temperature at different growth stages are different.2.According to the yield of the tested varieties,50 varieties were divided into high yield group(yield higher than 650kg/667m~2,20 varieties),middle yield group(yield below 650kg/667m~2,higher than 600kg/667m~2,17 varieties),low yield group(yield below 600kg/667m~2,13 varieties)three types.3.The average yield of high yield group is 677kg/667m~2,the average yield of middle yield group is 623.95kg/667m~2,and the average yield of low yield class is573.67kg/667m~2.The difference between the three types of production reached a very significant level.4.Different types of varieties,yield and yield traits are different,yield traits have different effects on yield,and the correlation degree of some agronomic traits and yield is different,and the correlation degree of agronomic traits is different.5.Among the tested varieties,20 hybrid rice varieties with high yield after wheat delayed direct seeding were initially screened out.In order to increase yield,we should take cultivation measures to increase the number of grains per spike and the number of grains per panicle.At the same time,the interrelationship between yield traits was well coordinated.