密度对不同玉米品种性状与产量的影响OA

To screen the best planting density and densite-tolerant varieties in the southwestern region of Guizhou,solving the problem of the lack of local density-tolerant varieties and the low planting density.this study used Zhenyu No.8,Haoyu No.4 and Jinyu 579 as materials,four planting densities were set up,namely 3 527 plants·(667 m2)-1(A1),3 889 plants·(667 m2)-1(A2),4 234 plants·(667 m2)-1(A3),and 5 015 plants·(667 m2)-1(A4).The effect of density on agronomic traits,yield and yield constituent factors of maize was explored by using the split-plot design.The results show that with the increase in planting density,the yield,effective panicles,plant height,panicle position height,inversion rate and hollow stalk rate all increase.The length of the spike,the thickness of the stem,the number of rows on the spike,the number of grains per spike,and the weight per hundred grains all decreased.There was no obvious change during the growth period.Correlation analysis revealed that density was extremely significantly positively correlated with effective panicles,inversion rate,and empty stem rate(P≤0.01),significantly positively correlated with panicle height(P≤0.05),and extremely significantly negatively correlated with panicle length and stem diameter.The yield was significantly positively correlated with the effective panicles and extremely significantly negatively correlated with the weight per 100 grains.The average yield of A4 density treatment was the highest[806.39 kg·(667 m2)-1],which was 7.41％,5.48％and 3.47％higher than that of A1,A2 and A3 respectively.Comparison among varieties,the yield of Zhenyu No.8 was significantly better than that of Jinyu 579.It performed the best overall at A4 density,with a yield of 844.39 kg·(667 m2)-1,and the increase in yield was 8.15％,with a prominent advantage in density tolerance.Research conclusion:Zhenyu No.8 can achieve high yields when planted at a density of 5 015 plants·(667 m2)-1.It is recommended to be the main density-tolerant variety promoted in the southwestern region of Guizhou.By combining this density with measures such as optimized fertilization and precise control in production,the risks of lodging and hollow stalks caused by high density can be avoided,and the yield of corn can be steadily increased.