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棉花的经济产量主要是通过绿色的叶面积进行光合作用制造的有机物质积累起来的。为了夺取棉花高产,在苗期应迅速提高叶面积系数,使棉花早发稳长,充分利用光能。开花结铃期又要稳定合理的叶面积,使它们合成更多的光合产物—干物质,为棉铃提供丰富的物质基础。在一定的范围内,随着叶面积的增加,光合产物也不断增加,产量也不断提高。但是叶面积也不是越大越好,如群体过大,势必造成棉田荫蔽,单位面积上积累的总干物质并不增加,干物质分配也不合理,产量反而会降低。在一般合理
The economic yield of cotton is mainly built up by the organic matter produced by photosynthesis in the green leaf area. In order to seize the high yield of cotton, the leaf area coefficient should be rapidly increased at the seedling stage so that the cotton will grow steadily and make full use of the light energy. At the flowering and boll stage, the leaf area should be stable and reasonable so that they can synthesize more photosynthetic products - dry matter and provide rich material foundation for cotton bolls. Within a certain range, with the increase of leaf area, photosynthetic products are also increasing, yield is also rising. However, the bigger the leaf area is, the bigger is the better. If the population is too large, it will inevitably cause the cotton fields to be shaded. The total dry matter accumulated per unit area will not increase, the dry matter will be distributed unreasonably, and the output will be reduced. In general reasonable