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植物的地上部分的营养主要不是来自于土中,其中干物质的百分之九十以上是通过叶片的光合作用,从空气中吸收GO_2,转化为碳水化合物,构成细胞结构和形成产量。玉米的最大光合速率(即平均每平方分米叶片在1小时内光照下吸收CO_2的量为60毫克,水稻为30～40毫克。最低的植物只有1～4毫
Aboveground parts of the plant nutrition is not mainly from the soil, of which more than ninety percent of the dry matter through the photosynthesis of leaves, from the air absorption GO_2, into carbohydrates, constitute the cell structure and the formation of yield. The maximum photosynthetic rate of corn (ie, the average amount of CO 2 absorbed by the leaves per day per decimeter leaf under light irradiation is 60 mg and that of rice is 30-40 mg. The lowest plant has only 1 to 4 milligrams