Effects of Different Planting Densities on Corn Dry Matter Accumulation and Yield
To explore the impact of planting density on yield in Tacheng area,the local main cultivar Huamei No.1 was selected,and three planting densities were set up as low density(Number of plants per 667 m2:7 300-7 600),medium density(Number of plants per 667 m2:8 300-8 600)and high den-sity(Number of plants per 667 m2:9 300-9 600)to explore the effects of different planting densities on corn dry matter accumulation,ear traits and yield in the area.The results showed that at the seed-ling stage,the low-density treatment had the highest plant height.The physiological plant height was 1.33 and 1.59 cm higher than the medium-density and high-density treatments respectively.The high-density treatment had the highest plant height after jointing.During the flowering stage,the physio-logical plant height of the high-density treatment was as high as 230.66 cm,and the leaf pillow plant height was 230.66 cm.As high as 197.17 cm,the average density was significantly higher than that of the medium-density and low-density treatments.Before the jointing stage,the dry matter accumula-tion of stems+leaf sheaths and leaves decreased with the increase of planting density.From the joint-ing stage to the flowering stage,the dry matter accumulation of stems+leaf sheaths,leaves.The dry matter accumulation of bract leaves had a tendency to increase with the increase of planting density;the ear height,stem+leaf sheath+tassel dry matter accumulation,number of grains per ear,and 100-grain weight at maturity all increase with the increase of density,such as,the low-density,me-dium-density and high-density panicle heights at maturity are 89.87,92.87 and 94.76 cm respectively,while the stem+leaf sheath,blade and bract dry matter transfer amount and transfer efficiency,the stem+leaf sheath and bract dry matter effect on the grain.The contribution rate,grain number per panicle,100-grain weight,and grain dry matter weight per panicle decreased with the increase in den-sity.Among them,the contribution rate of low-density stems+leaf sheaths to grains was 8.337%,that of medium-density dropped to 6.616%,and that of high-density dropped to 6.470%.The number of grains per panicle in the low-density,medium-density and high-density treatments were 517.07,497.53 and 447.30 grains/pan respectively,with extremely significant differences.Under this test con-dition,the yield per unit of medium-density was 1 230.47 kg.
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