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采用氮、磷肥单施或配比施肥等10个不同的肥料处理,在沿太湖地区对紫云英产量、养分积累以及紫云英耕翻回田后土壤养分的变化进行了研究。结果表明,氮肥对紫云英地上部分和总产量的提高效应显著大于磷肥,而磷肥的施用特别是氮磷肥配施对紫云英地下部分增产效应显著高于氮肥。氮肥和磷肥对植株氮含量提高的效率较接近,而单独施用磷肥和氮磷肥配合施用能显著提高植株磷含量和磷积累量。紫云英还田可以提高土壤有机质和全氮含量,在氮肥(N)施用量为103.5 kg/hm2、磷肥(P2O5)为72 kg/hm2时,紫云英还田量最高达34 606 kg/hm2,土壤有机质和全氮含量达到28.16 g/kg和1.540 g/kg,比空白分别提高36.3%和35.7%。
Ten different fertilizers, such as nitrogen and phosphate fertilizer alone or compound fertilization, were used to study the changes of soil nutrients in the areas along the Taihu Lake after the production of milkvetch, the accumulation of nutrients and the transplanting of purple-leaved and tilipy soil. The results showed that the increasing effect of nitrogen fertilizer on the aboveground part and total yield of Astragalus sinicus was significantly greater than that of phosphate fertilizer. However, the application of phosphate fertilizer, especially the application of nitrogen and phosphorus fertilizers, was significantly higher than that of nitrogen fertilizer on the underground part of Astragalus sinicus. Nitrogen and phosphorus fertilizers are more effective to increase the nitrogen content of plants, and the application of phosphate fertilizer and nitrogen and phosphorus fertilizer alone can significantly increase the plant phosphorus content and phosphorus accumulation. The return of the soil to the soil increased the soil organic matter and total nitrogen, and reached the highest level of 34 606 kg / hm2 when the N application rate was 103.5 kg / hm2 and P2O5 was 72 kg / hm2. hm2. The contents of soil organic matter and total nitrogen reached 28.16 g / kg and 1.540 g / kg, respectively, up 36.3% and 35.7% respectively compared with the blank.