Comprehensive Evaluation Of Yield And Yield Components Of Lower Limit Of The Second Accumulated Temperature Zone In Heilongjiang Province

Yield traits of rice are the most important objective of new varieties breeding,but their stability can not be ignored,and their yield stability is greatly affected by the environment.Stability and adaptability directly determine whether a new rice variety can achieve high yield under different environmental conditions.Although pursuing high yield of new rice varieties is not the only goal,it will directly affect the promotion and application of new varieties.In this study,Longjing 21 was used as a control variety,and analysis methods such as analysis of variance,correlation analysis and parameter estimation were used to analyze Kendao 17112,Kendao 1725,Kendao 17414,Kendao 1767,Kendao 92,Kenjing 1704,Longken 2203,Longken 263,Longken 269,Longken 290,Longken 291,Longken 292,Longken 293,Zhongken 8 and mutual interaction between varieties and locations Effect.At the same time,the effects of four yield traits,such as effective panicle number,solid grain number,1000-grain weight and plot yield,on yield were explored,in order to clarify the adaptability and stability of each test material in different planting areas.The test results can provide reference for breeding new rice varieties.The specific research results are as follows:(1)The effective spikes,solid grains and 1000-grain weight of rice varieties have a direct impact on the yield components,which are affected by the environment,thus affecting the yield of the varieties.There was a significant positive correlation between effective panicle and grain number and yield,but 1000-grain weight had little effect on yield.That is to say,in the case that a variety does not change much in 1000-grain weight,the effective number of spikes and the number of real grains are the main driving forces for increasing yield.(2)Longken 263 and Longken 2203,which have larger panicle type,more solid grains,moderate effective panicles,stable 1000-grain weight and good grain plumpness,are stable-yield varieties with less environmental impact,strong environmental adaptability and good yield stability.(3)Through the research results,it can be found that Longken 291 has the characteristics of stable yield and high yield in 8 test points.The yield performance of the 8 trials is consistent,which is higher than that of the control variety Longjing 21,and the stability is good.The increase rate is 10.2%,which has a significant increase in production and is a stable and high-yield variety.