棉花高产品种的株型特征研究

以泗棉3号作为近期育成的棉花高产品种的典型代表，与苏棉5号进行比较，研究高产品种的株型形成特点。其主要结果为，高产品种在株型结构上表现为植株有适当的高度，主茎及果枝节间长度分布均匀，第一果节间较长，横向生长势弱。果枝与主茎夹角由下向上呈逐渐变小趋势，植袜为塔型。叶片较小，且与水平面夹角大，叶层分布均匀，株型疏朗，消光系数小，这样有利于改善植株内部的光照条件，提高光合效能。

Study on the Plant Type Characteristics of High-yielding Cotton Varieties

In this paper, high yielding cotton variety Simian 3 was used, as a typical representative and to be compared with Sumian 5. The plant-type formation were studied so as to offer several internal and external reference indications for breeding new varieties.The main results obtained were as follows high yielding varieties were characterized on plant type structure by such characteristics as moderate plant height,uniform distribution of inter-node length on the main stem and fruiting branches,relatively longer than that of the length of first inter-node,and week growth vigor on the horizontal direction; the angles between main stem and fruiting branches with a tendency of becoming small gradually, plant of pyramid type; leaves relatively small and with a large angle between leaf and the horizontal surface, uniform distribution of leaf layers, plant type not too compact, lower extinction coefficient.All these characteristics are beneficial to improving the photo conditions in the internal part of the plant and raising photosynthetic efficiency.