同一棉株上不同部位棉铃,以及同一棉瓤内不同子位的子棉,主要经济性状有差异,并且这种差异可以影响到种子后代,已为许多研究工作所证明。这些研究工作所得结果基本相同,但某些方面仍有出入。例如吴泽雍(1937)认为,测量纤维长度取样时,无须考虑取样棉铃在棉株上的部位;但据陈布圣(1958)研究结果,愈是下部的 Cotton bolls from different parts of the same cotton plant, as well as cotton seed from different sub-loci within the same cotton plant, have different economic traits and may affect seed progeny and have been proved by many researches. The results of these research work are basically the same, but some aspects are still different. For example, Wu Ze-Yong (1937) argues that there is no need to consider sampling boll bolls on cotton plants when measuring the length of the fiber. However, according to Chen’s study (1958), the lower