为了棉子发芽整齐、幼苗健壮,以保证适当密植和获得高额产量,在棉花管理过程中选种是有决定性的关键问题。在方法上,株选与粒选的效果,早在广大农民的生产实践中得到证实,因而成为棉花生产工作中的主要措施。但由于选种技术、品种和年前棉花生育情况等条件不同,选种的效果也受到一定限制。在棉花生育后期降雨较多、成熟期延迟或棉子不够充实的情况下,严格进行选种更属必要。一般的选种法是在田间选定留种的棉株,株上选 In order to germinate cotton seedlings, seedlings robust, in order to ensure proper close planting and access to high yields, selection of cotton in the management process is a decisive key issue. In terms of methods, the effects of strain selection and grain selection have been confirmed as early as the peasant’s production practice and have therefore become the major measures in cotton production. However, due to the selection of technology, varieties and years before cotton breeding conditions such as different conditions, the effect of selection is also subject to certain restrictions. In the latter part of cotton growth more rainfall, delayed maturity or insufficient enrichment of cotton under the circumstances, the strict selection is even more necessary. The general selection method is selected in the field of cotton seed, plant on the election