品种对3∶1式直播棉棉铃发育的影响

Effect of Cotton Varieties on the Boll Development of Field Seeding with 3∶1 Cotton wheat Double Cropping Model

研究结果表明：品种对铃重影响作用表现为中早熟品种大于中熟品种，中早熟品种棉纤维发育早于中熟品种。３∶１式直播中熟品种极不利于棉纤维发育。品种对棉籽（仁）脂肪累积影响表现为中早熟品种优于中熟品种，晚播对中熟品种棉籽（仁）脂肪累积影响大于中早熟品种。棉仁脂肪酸和氨基酸含量在品种间的差异因播期而异。３∶１式直播棉棉铃发育受播期影响大，生产上以中早熟品种为好。

The results showed that the earlier middle maturity cotton boll weight was heavier than the middle maturitys. Fiber development difference among varieties showed that ealier middle maturity varieties were much earlier than the middles ,it's very unfavourable for fiber development that sowing the middle maturity varieties late with field seeding methods. As to the effect of varieties on fat accumulation in cotton seed (kernel), the earlier middle maturity varieties were more sentisive than the middles, but the accumulation of protein was just contrary, effects of late sowing on the middle maturity varieties fat accumulation were much more than the earlier middles. The difference reason of cotton kernel fat acid contents and kernel amino acid contents among varieties was sowing date. The earlier middle varieties were much better to the field seeding with 3∶1 model than others, the sowing date had great effect upon it.