容城农田土壤的速效磷养分状况及供磷能力

A Study on the Readily Available Phosphorus of Soil Nutrient Status and the Soil Ability to Supply Phosphorus

为给冬小麦高产提供合理施用磷肥的科学依据,采用田间试验法,以容城轻壤质潮土为研究对象,对农田土壤速效磷的养分状况及冬小麦田间试验进行分析,探讨了土壤的供肥能力。结果表明,容城土壤含磷水平较高,高、中水平占60%之多,但差异性较大,冬小麦土壤磷素贡献率高、中、低产田分别达到82.37%9、0.36%和84.82%,土壤的供磷能力分别为67.646、3.75和57.11kg/hm2,推算出了高、中、低产田冬小麦经济最佳施肥量分别为1191、11和109kg/hm2。

To provide a scientific basis for reasonable application of phosphate fertilizer to give high yield of winter wheat,the authors has studied the light and nature cultivated fluviogenic soil of Rongcheng in the field,analyzed the available phosphorus nutrient status in the soil and the result of winter wheat field experiments and discussed the soil ability to supply phosphorus.The results has shown that the soil of RongCheng contains rich indigenous phosphorus and more than 60% is at the high and medium levels.But the difference is great：The ratios of the phosphorus contribution to winter wheat yield are respectively 82.37%,90.36% and 84.82% in high,medium and low-yielding fields; the soil ability to supply phosphorus are 67.64,63.75 and 57.11 kg/hm2;the economic optimum phosphorus fertilization to winter wheat are 119,111 and 109 kg/hm2.