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我县通过土壤普查表明,全县土壤中含碱解氮120ppm以上的占全县水稻面积66.6％;速效磷10ppm以上的占9.6％;含速效钾100ppm以上的占9.04％。由此可见,土壤中氮磷钾的比例严重失调,但在生产中往往偏重氮肥,每亩施用量日趋增多,而磷钾的施用量很少。表1明显表示全县土壤中的磷钾严重亏损,极大地影响着产量的进一步提高,因此,控制用氮,提倡氮磷配合施用,积极推广增施磷钾肥,是挖掘我县粮食增产潜力的一条重要措施。
County through the soil census shows that the county soil with alkali-nitrogen 120ppm or more accounted for 66.6% of the county’s rice area; available phosphorus more than 10ppm accounted for 9.6%; containing more than 100ppm potassium more than 9.04%. Thus, the proportion of N, P and K in soil is seriously imbalanced, but nitrogen fertilizer is often biased in production, and the application rate per acre is increasing day by day while the application amount of P and K is few. Table 1 clearly shows that the entire county soil phosphorus and potassium serious losses greatly affect the further increase of production, therefore, control of nitrogen, to promote the application of nitrogen and phosphorus, and actively promote the application of phosphorus and potassium fertilizer is to tap the potential of food production in our county An important measure.