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世界上的磷肥资源有限,而磷肥的利用系数一般不超过20—40%。苏联农业工作者对磷肥在冬小麦、甜菜和玉米等作物中的利用系数进行了研究。结果表明,在这些作物中,利用系数随着施肥量的增加而下降。以施肥量为0.67公斤/亩时,利用系数为最高,可这50%。当施肥量为6—8公斤/亩时,在甜菜和冬小麦中的利用系数分别为18.8%和5.3—9.8%。在施磷肥的同时,再施以氮肥,可以提高磷肥的利用系数,例如在冬小麦和甜菜中,分别施加4—6公斤/亩和8公斤/亩的氮肥,则磷肥利用系数可分别提高到24
The world’s phosphate fertilizer resources are limited, and phosphate fertilizer utilization factor generally not more than 20-40%. Soviet agricultural workers have studied the coefficient of utilization of phosphate fertilizer in crops such as winter wheat, sugar beet and corn. The results showed that in these crops, the utilization coefficient decreased with the increase of fertilization amount. When the amount of fertilizer is 0.67 kg / mu, the utilization factor is the highest, which can be 50%. The coefficient of utilization for beet and winter wheat was 18.8% and 5.3-9.8%, respectively, at 6-8 kg / acre. When phosphorus fertilizer is applied, nitrogen fertilizer can increase the coefficient of utilization of phosphate fertilizer. For example, applying 4-6 kg / mu and 8 kg / mu nitrogen fertilizer to winter wheat and sugar beet, the coefficient of utilization of phosphate fertilizer can be increased to 24