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植物体的干物质中90～95%是通过光合作用得来的,所以如何充分合理地利用太阳光能是农业生产的关健。 1.提高复种指数。复种指数就是全年内农作物的收获面积对耕地面积之比。提高复种指数就是增加收获面积,延长单位土地面积上农作物的光合时间。提高复种指数的措施就是通过轮、间套种,在一年内巧妙地搭配各种作物,从时间上和空间上更好地利用光能,缩短田地空闲时间,减少漏光率。
90-95% of dry matter in plant body is obtained through photosynthesis, so how to make full and reasonable use of solar energy is the key to agricultural production. 1. Increase the multiple crop index. The multiple cropping index is the ratio of harvested area to cultivated area over the year. Raising the multiple cropping index is to increase the harvested area and extend the photosynthetic period of crops on unit area of land. The measure to increase the multiple cropping index is to skillfully match various crops within one year through intercalary and intercropping to make better use of light energy in time and space to shorten the free time in the field and reduce the light leakage rate.