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以通州区石灰性灰潮土为供试土壤,研究了不同施磷水平对土壤速效磷含量及水稻产量的影响,测定了水稻不同施磷水平下磷肥的利用率。结果表明,在中等含磷的土壤上,石灰性灰潮土的磷肥系数为1.72,磷肥临界值为6.0 mg/kg;水稻合理施用磷肥能显著增产,但产量只在一定的施磷水平下随着施磷量的增加而增加,其667 m2最经济施磷量为3.8 kg,最高产量施磷量为9.4 kg。磷肥利用率则随施磷量的增加而逐渐下降,平均利用率为8.5%。
Taking calcareous gray soil in Tongzhou district as tested soil, the effects of different phosphorus application levels on soil available phosphorus and rice yield were studied, and the utilization rate of phosphate fertilizer under different phosphorus application levels was measured. The results showed that the phosphate fertilizer coefficient of calcareous gray soil was 1.72 and the critical value of phosphate fertilizer was 6.0 mg / kg on moderately phosphorus-containing soil. The reasonable application of phosphate fertilizer could significantly increase the yield of rice, but the yield was only increased with the application of phosphorus With the increase of phosphorus application, the most economical phosphorus application amount was 66 kg m2 and the highest phosphorus output was 9.4 kg. Phosphate fertilizer utilization rate decreased with the increase of phosphorus application, with an average utilization rate of 8.5%.