Study On The Correlation Between Yield And Agronomic Traits In Different Varieties(Lines) Of Wheat

In order to ascertain the contribution of agronomic traits to the yield of existing wheat varieties(lines)and their correlation with yield,this study combined the wheat regional trials and variety selection tests undertaken in Henan Province to yields of 85 wheat varieties(lines).And its composition was investigated,and the agronomic traits and physiological indicators of some varieties were analyzed in combination with the type of cultivar.The results are as follows: 1.Differences in wheat yield and composition between different typesBased on the yield and compositional factors,the 85 new wheat varieties(lines)were divided into high-yield types(including 40 new lines,with an average yield of 7659 kg/hm2)and middle-type types(29 new lines,average The yield was 6871 kg/hm2)and the lower yield type(16 new lines,the average yield was 6204 kg/hm2).There was a significant difference among the three types of yield.Comparing the yield components,it was found that there was a significant difference between the 1000-grain weight and panicle number and the lower-yield type in the high-yield and middleyielding types.Among them,high and medium grain production had a relatively lower number of spikes per plant,an increase of 78.68(104/hm2)and 64.79(104/hm2),and a thousand grain weights of 2.52 g and 2.73 g,respectively.2.Different types of wheat yield and composition factors related to differentThe correlation analysis of wheat yield and its constituents of different yield types showed that the yield was positively correlated with the 1000-grain weight in high-yield types,and there was no significant positive correlation with panicle number and grain number per ear,indicating that grain yield was increased under high-yield conditions.Stress is the key to further high production.In the middle type,there was a very significant positive correlation between yield and panicle number,and a positive correlation with grain number per panicle and 1000-grain weight was not significant,indicating that the number of panicles should be the main increase,and grain number and grain weight should be taken into account;Among medium and low-yielding types,panicle number was significantly positively correlated with yield,and there was no significant positive correlation between panicle number and yield,while 1000-grain weight was negatively correlated with yield,indicating that increasing panicles was the key to increasing yield.3.Some agronomic traits differ among different types of wheat cultivarsThe results showed that the dynamics of stems and pods of different types of cultivars(lines)were basically the same,but there were significant differences in the number of effective panicles at the ripening stage: The number of high-yielding types of wheat before jointing stage was sufficient,and the number of effective panicles at the ripening stage was the highest,indicating its ability to produce tillers and ears.Stronger;the highest tiller at the jointing stage is significantly higher than the other types of middle tillers,but its ability to form ear is limited.The number of effective panicles at maturity is slightly lower than that of the high yield type,and the lower yield types have weak ability to tiller and make ear,resulting in its effective The ear number is significantly lower.Studying the plant height and leaf area,we found that the plant heights of different wheat cultivars differed little(75-85cm),and the leaf area index showed high yield types ? medium production types ? lower yield types.4.Dry matter accumulation between different types of cultivars and their contribution to yieldThe results showed that the dry matter and nitrogen accumulation of wheat plants showed an increasing trend with the advancement of the growth period,and the increase was largest from the jointing stage to the flowering stage.High-yielding,mediumyielding dry matter and nitrogen accumulation were significantly higher than lowyielding types.The biomass and nitrogen transport performance of various types of cultivars showed that the contribution of pre-flower vegetative organ storage materials to grains was higher than that after flowering.Increase in output and increase.