棉花学报 Cotton Science 2006，18(1)：47～52
Study on Superiority of Yields and Fiber Quality of Double-stem Cotton and Boll-setting Mechanism Abstract：To achieve high yield，quality cotton and better benefit with amass boll-setting in Jianghuai valley cotton district，China，study on yields and fiber quality of double-stem cotton and boll-setting mechanism were implemented in Nanjing，regarding double-stem cotton as treatment and single-stem cotton as check. The experiment results of two years indicated：the farm-growing period was reduced about 40 days，the seed cotton yield of double-stem cotton was 12.72% higher than CK in 2002，and was 17.04%，20.99% higher than CKⅠ，CKⅡ in 2004，both on remarkable lever. The percentage of high-quality boll of double-stem cotton in 2004 was 21.46、2.75 higher than CKⅠ、CKⅡ. Grey correlative degree analysis to the fiber quality of double-stem cotton and CKⅠ、CKⅡ，the result manifested that the overall fibre quality of double-stem cotton is superior to the other two treatments. The double-stem cotton has remarkable superiority on cotton yield and fiber quality to the single-stem cotton，it was prominently showed on the amass boll-setting effect in the best solar radiation and heat season and the boll-setting spatiotemporal effect. During the amass boll-setting in step with the best solar-heat season，the intensity of boll-setting of cotton amount to 3.65×104 per hecter per day，it was over1.0×104 per hecter per day than CK. The quanty of the boll in summer and early-autumn was 25.63×104～36.00×104 per hecter much than CK，and the quanty of the boll near the main stem in middle-bottom place was 17.0×104 much than CK.
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