Effects of planting density and DPC dosage on plant structure and yield of cotton under 76 cm equidistant cultivation
During 2021 to 2022,under 76 cm equidistant cultivation,a split-zone design was used to set planting density as the main factor,which was 150 000(M1),202 500(M2),and 255 000 plants·hm-2(M3)respectively,and the dosage of DPC(Mepiquat chloride)as the sub-factor,which was 195(D1),390(D2),and 585 g·hm-2(D3).The effects of different planting densities and DPC dosage on cotton plant structure,seed cotton yield and its components were investigated,in order to screen suitable combinations of planting density and DPC dosage for improving cotton yield under 76 cm spacing planting pattern.The results showed that,when the same amount of DPC was used,reducing planting density increased the height of cotton plants by 7.09％～21.66％,stems thickness by 4.36％～13.02％,plants width by 5.76％～18.69％,increased the height of the first node of the fruit branches,the length between the main stem internodes,the number of fruit branches,and the length of fruit branches.The planting density has no significant effect on the length of the first node of the fruit branches and the angle between the fruit branches.When planting density was the same,reducing the dosage of DPC increased cotton plant height by 7.01％～21.83％,plant width by 4.61％～9.01％,the number of fruiting branches by 1～2,and effectively increased the height of fruiting branch initiation,fruiting branch initiation node,the length of the main stem internode,the length of fruiting branches and the angle of the fruiting branches,but it reduced the cot-ton stem thickness by 3.39％～8.30％.Seed cotton yield with the increase in density and the amount of DPC showed a trend of increasing and then decreasing.M2D2 treatment seed cotton yield was the highest,two years were 6 614.09 kg·hm-2 and 7 339.48 kg·hm-2,compared with the lowest yield in the same year the treatment M1D1,increased by 19.63％and 22.67％,respectively.In conclusion,the combination of cotton planting density of 202 500 plants ·hm-2 with spraying of 390 g·hm-2 of DPC was the best in 76 cm equidistant cultivation,which was favorable to growth and development of cotton and yield improvement.
cotton76 cm equidistant cultivationplanting densityDPCplant structureyield
万方数据
维普
