棉铃着生位置对棉花主要经济性状的影响

选用新品系８９５作试材进行了棉铃着生位置对其经济性状的影响研究。结果表明，棉铃在植株上的着生部位不同，其相应的产量构成因素以及纤维物理性能指标也存在同株差异，如铃重、衣分、子指和绒长、强力、细度等，并表现出一定的规律性。各果枝的第１节结铃性最强，铃重最大，随着果枝从下到上，相同节位棉铃重和衣分呈现出抛物曲线变化趋势，同一果枝上的棉铃，随着节位的外延，铃重和衣分分别表现出降低和增高的直线变化趋势，纤

The Influences of Boll Position on Main Economic Traits in Upland Cotton

The differences of cotton boll position in the same plant result in differences in yield components such as boil weight, seed index and lint percentage and in fiber physical characteristics such as fiber length, strength and fineness.These differences show some read.larities. The first boil position of each fruiting branch on the same plant has the highest boll-forming ability and can produce the largest bolts. Boil weight and lint percentage change in parabolical curves with rise of fruiting branch nodes. Boll weight and lint percentage sharply rise and fall espectively with extension of boil position on the same finiting branch: fiber physical characteristics change as follows: Fiber fineness change gradually from fineness to coarseness and then from coarseness to fineness,fiber strength, gradually from strongness to weakness, but fracture length does not change with rise of fruiting branch node on the same plant.Fiber fineness and length increased and fiber strength decreased with extension of boil position on the same fruiting branch.