Effects of different planting densities on agronomic traits and yield of Zhongmian 113
[Objective]To study the effects of different planting densities on the agronomic traits,yield and fiber quality of CCM 113 and determine the suitable planting density of CCM 113 under machine harves-ting mode.[Methods]In this experiment,6 density treatments were set up with China Cotton 113 as the test variety:9×104 plants/hm2(D1),12×104 plants/hm2(D2),15×104 plants/hm2(D3),18×104 plants/hm2(D4),21×104 plants/hm2(D5)and 24×104 plants/hm2(D6)to study the effects of different planting densi-ties on their growth and development,boll spatial distribution,dry matter accumulation and yield under the traditional machine harvesting mode.[Results]Zhongmian113 plant height and stem thickness decreased with increasing planting density;leaf area index reached its peak around 88 days after seedling(around August 1),with the highest in D5 treatment at 4.1;with increasing planting density,the height of fruiting branches shed by cotton boll gradually approached from the 2nd and 3rd fruiting nodes to the 1st fruiting node,while the two shedding HF areas in the upper and lower parts of the cotton plant approached to the middle fruiting bran-ches.The cotton boll tended to be borne in the inner part of the cotton plant,and the spitting boll was mainly borne in the lower part of the cotton plant.The dry matter accumulation of nutritional organs of cotton tended to increase and then decrease with the increase of density,while the dry matter accumulation of reproductive or-gans increased with the increase of density.The seed cotton yield was the highest in D5 treatment with 5217.83 kg/hm2,which was not significantly different from D4 treatment and significantly different from D1,D2,D3 and D6 treatments.[Conclusion]Reasonably dense planting is conducive to the cotton plant to make full use of natural resources and promote growth and development.In a film six-row(66 cm+10 cm)machine pick-ing mode,planting density at 21×104 plants/hm2(D5)is conducive to medium cotton 113 to obtain a higher machine-picked cotton yield.
国家科技期刊平台
NSTL
万方数据
