Effects of planting density on yield and fiber quality of direct-seeded cotton after barley
To determine the appropriate planting density for direct-seeded cotton after barley,field experiments were conducted,and the effects of planting densities on cotton yield and fiber quality of cotton CCRI50 (Gossypium hirsutum L.)were evaluated in the Lower Reaches of Yangtze River in Nanjing and Xinghua,Jiangsu province of China in 2012.The results showed that,fruiting positions and bolls of cottons per unit ground area stayed stable,however,bollbearing dynamics varied.Bolls were formed earlier and fruiting positions were more concentrated under higher planting density (7.50×104 plant per hectare and 8.25 ×104 plant per hectare in Xinghua and Nanjing,respectively) than those of under other planting densities.Boll spatial distribution of cotton plant was influenced by planting density as well.The percentages of peripheral boll and leafy-monopodia branche boll were higher under lower planting density (5.10×l04 plant per hectare and 5.25×104 plant per hectare in Xinghua and Nanjing,respectively) than those under higher planting density,which in turn affected the concentrate boll-opening.Under higher planting density,the percentage of bolls on lower fruit branches was increased while decreased for peripheral and leafy-branch bolls,which led to the higher percentages of summer and pre-autumn bolls and eventually better fiber quality.The practical yields achieved the highest under the densities of 5.70×104 plant per hectare to 7.50×104 plant per hectare and 6.75×104 plant per hectare to 8.25×104 plant per hectare in Xinghua and Nanjing respectively.To sum up,the early maturing direct-seeded cotton after barley could achieve high yield and good fiber quality when the planting density was at 7.50×104 plant per hectare and 8.25×104 plant per hectare in Xinghua and Nanjing,respectively.
direct-seeded cotton after barleyplanting densityyieldfiber quality
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万方数据
维普
