Response Of Growth And Yield Of Hybrid Rice To Periodic Deficit Irrigation And Study On The Differences Among Varieties

To explore hills was seasonal water shortage of oil crop in northeast sichuan live hybrid rice growth and yield and the influence of different rice varieties on the moisture content of the differences between the conditioned response,with 32 hybrid rice varieties as materials for oil crop live field experiment,a normal irrigation(T1),tillering to jointing stage deficit irrigation(T2)and booting to anthesis deficit irrigation(T3),three different irrigation treatment,the test measurement testing varieties under three processing stem tillers dynamics,yield traits and yield,and the economic characters of correlation analysis,path analysis,factor analysis and the analysis of the drought resistance.The main results are as follows:1.Irrigation treatment had obvious effects on the number of tillers and the rate of rice.All the tested cultivars entered the fast tillering stage about 35 days after sowing,and the dynamic change of tiller was basically the same,which increased to the maximum and then decreased to the stable.However,the mean value of the highest tiller number of rice varieties under different treatments was T2>,T1>,T3.Compared with T1,T2 and T3 decreased by12.9% and 10.2% respectively,and the differences between treatments reached an extremely significant level.The average spike rate of rice varieties under different treatments was T3>T2>T1.Compared with T1,T2 increased by 4.7 percentage points,the difference did not reach a significant level,and T3 increased by 9.1 percentage points,the difference reached a significant level.The response of the highest number of tiller and the rate of rice to irrigation treatment varied in different degree.2.The effects of irrigation treatment on rice yield traits were as follows: compared with T1,the average effective panicle value of the tested rice varieties under T2 treatment decreased by 4.29%,the seed number increased by 3.79%,the seed number increased by3.69%,the seed setting rate decreased by 0.03%,and the 1000-grain weight increased by0.58%.Under T3 treatment,the average effective panicle value of the tested rice varieties increased by 1.55%,the number of grains was decreased by 2.27%,the number of grains was decreased by 10.83%,the seed setting rate was decreased by 8.43 percentage points,and the 1000-grain weight was decreased by 0.44%.The yield characters of different rice varieties also showed great differences in response to irrigation treatment.3.The measured results of rice yield under different irrigation treatment showed that the average yield of the rice varieties under T1 treatment was 645.9kg/667m2.The average yield of T2 treatment was 639.2kg/667m2,which was 1.03% lower than that of T1 treatment.Among all the tested varieties,14 showed increased yield,with an increase of 0.44%--24.29%.In 18 cases,the reduction was 0.04%-21.13%.The average yield of T3 treatmentwas 579.3kg/667m2,which was 10.31% lower than that of T1 treatment.All the tested varieties showed reduced yield,with a decrease of 0.24%-21.48%.4.The correlation analysis results of rice yield traits under different irrigation treatments showed that under T1 and T2 treatment,the yield was positively correlated with the effective panicle,seed number,seed number,seed setting rate and 1000-grain weight,while under T3 treatment,the yield was negatively correlated with seed setting rate and positively correlated with the effective panicle,seed number,1000-grain weight and grain number.Under the treatment of T1 and T2,the direct effect from large to small was the number of solid grains >,the effective grain weight >,the setting rate of >,and the direct effect from large to small was the effective grain weight >,the effective grain weight >,the effective grain weight >,the effective grain weight >,and the direct effect was positive.Through factor analysis of the rate of change of T2 and T3 relative to T1,it can be seen that the basic change law is the same,but the contribution rate is different.5.According to the comprehensive evaluation of the tested varieties according to the yield and yield traits under different treatments,13 varieties with strong drought tolerance during tiller-jointing period were selected,including fyou 498,nei5 you 39,chuanyou 6203,chuanyou 8377,huaxiang 7,neixiang 6you 9,nei5 you H25 and dexiang 4103.The drought-tolerant varieties in the booting period were yixiangyou 1108,longyou 8,huaxiang you 1,y2 you900,ne2 you111,ne6 you538 and rongyou 1808.The drought-tolerant varieties in both periods were longyou 8 and huaxiang you 1.The results of this study provide a scientific basis for water management and variety selection of live hybrid rice with oil stubble(or wheat stubble)in hilly arid areas.