弱苗晚发是麦棉套种棉花的一个主要问题。研究解决这个问题,对于提高棉花产量和品质,具有重要的现实意义。我们通过试验和大面积调查,初步研究了麦棉共生期间棉花弱苗晚发的成因,探索了克服的措施。一、套种棉田主要生态因子对棉苗生育的影响(一)光照条件的影响:套种棉苗和小麦共生,受小麦遮荫的影响,其光照条件比单作棉田较差。据1978年5月11日、13日、25日在闻喜县涑阳大队套种棉田太阳辐射强度的测定,麦行两侧的棉苗一天内的光照强度,除11—13时外,均低于单作棉田(表1)。套种棉田共生期内全日的太阳 Weak late rice is a major problem cotton interwoven cotton. To study and solve this problem has important practical significance for improving cotton yield and quality. Through experiments and large-area surveys, we initially studied the causes of late-season cotton weeds during wheat-cotton symbiosis and explored ways to overcome them. First, intercropping cotton main ecological factors on cotton seedling growth (A) the impact of light conditions: Intercropping cotton seedlings and wheat symbiosis, affected by wheat shading, the lighting conditions than single cotton worse. According to the May 11, 13, and May 25, 1978, the intensity of solar radiation in the interplanting cotton fields of the Baifeng project of Xingyang County was measured. The light intensity of the cotton seedlings on both sides of the wheat bank in one day was lower In a single cotton field (Table 1). Interplanting cotton symbiosis throughout the day the sun