实行棉田间套复种应注意的问题河北省部分产棉区种棉经济效益不高有多方面的原因，但其中长期沿用传统的单一种植也是一个重要因素。据调查：当前河北省棉田７５％为单作，复种指数仅为１２５％。借鉴省内外先进经验，发展棉田间套复种技术，可以提高上地和光热资源利用率... Implementation of cotton seed sets should pay attention to the issue of cotton production in some cotton areas in Hebei Province, economic benefits are not high in many ways, but the long-term use of traditional single plantation is also an important factor. According to the survey: At present, 75% of cotton fields in Hebei Province are single-cropping and the multiple cropping index is only 125%. Draw on the advanced experience both inside and outside the province to develop multi-cropping techniques for cotton fields, which can improve the utilization rate of land and light and heat resources ...