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| Boll spatial distribution of cotton cultivar Baimian1 with different planting densities under remaining monopodial branches |
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| Abstract: |
| Field study was conducted to investigate changes of unginned cotton yield，fiber quality and spacial
distribution of cotton bolls with planting density under remaining monopodial branches with cotton cultivar Baimian1 as
material. The results showed that unginned cotton yield per area significantly increased first and decreased later with no
significant change during 4 502.5-4 732.7 kg/hm2 under the planting density of 30 000-60 000 plants/hm2，and fiber
quality had no significant change among different planting densities. Cotton bolls，boll weight and unginned cotton weight
of main stem and monopodial branches，respectively，significantly decreased with planting density increasing，and the
decreasing value was higher for monopodial branches than for main stem. The ratios of bolls and unginned cotton yield
of main stem to those of the whole plant increased with density increasing，and contrary trends happened for monopodial
branches. Spatial distribution of bolls and unginned cotton yield of monopodial branches were similar to those of main
stem，with middle and lower layer（1-10 fruiting branches）and inner circle（1-2 fruiting positions）as main body，e.g. the
ratios of unginned cotton yield of middle and lower layer and inner circle of monopodial branches to that of all monopodial
branches per plant accounted for 90.9%-95.3% and 88.0%-95.9%，and the ratios of unginned cotton yield of middle and
lower layer and inner circle of main stem to that of the whole main stem were 81.9%-92.9% and 75.7%-96.3%. |
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