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我国南方棉区的棉麦两熟地区,原有的麦行套种棉花的方法,在进一步提高棉麦两熟产量的要求下,因为麦类要缩小行距、增加密度,而棉花要适期早播,两者产生矛盾。近年实践证明,在劳力较充足的条件下采用棉花育苗移栽可以克服这个矛盾,使棉麦两增产。但对棉花育苗移栽能增产的原因,却有种种说法。有的认为是由于多一块营养缽的肥料;有的认为是由于移栽时使棉苗主根折断形成鸡爪根,易于吸收土壤耕作层的养分;但也有的认为育苗移栽对第一次侧根数影响不大;有的则认为营养缽育苗由于能及时早播,这时光照短有利于通过阶段发育,因而早熟增产;也有的认为麦行套种的棉花所受的光照较弱,有利于棉苗发育。增产的原因究属何在?我们根据几年的试验有以下几点看法。
Cotton and wheat in southern cotton area of our country two areas, the original method of cotton interplanting wheat, cotton and wheat in two further improve the yield requirements, because the wheat to narrow the row spacing, increase the density, and the cotton to be suitable for early sowing There is a contradiction between the two. In recent years, it has been proved in practice that using cotton seedling transplanting under over-sufficient labor conditions can overcome this contradiction and increase cotton-wheat yield. However, cotton seedling transplanting can increase the production of reasons, there are a variety of claims. Some think it is due to more than a bowl of fertilizer fertilizer; Some think that is due to transplanting so that the main root of cotton seedlings broken off the formation of chicken claw roots, easy to absorb nutrients in soil cultivation layer; but some believe that transplanted nursery on the first lateral root Number of little effect; while others believe that the nutrition Bowl nursery because of timely and early sowing, then the light is conducive to the development stage through the stage, so early maturity; some also believe that wheat line intercropping cotton suffered light is weak, is conducive to cotton Seedling development. What is the reason for the increase? According to several years of experiments we have the following observations.