有机与无机氮肥配施对设施栽培菜田土壤肥力及产量的影响

长期单独施用无机氮肥降低土壤有机质含量,而有机肥与无机氮肥配施提高了土壤中有机质的含量.长期施用氮肥对土壤中氮的增长并没有很明显的改善,而有机肥与无机氮肥配施显著提高了土壤有效氮的含量.长期施用无机氮肥降低了土壤中速效磷和速效钾的含量,而配施有机肥提高了土壤速效钾的含量,而速效磷含量变化不显著.长期偏施氮肥容易导致土壤pH值下降,土壤酸化.有机肥与无机氮肥配施缓解了土壤pH值的下降,改善了土壤的理化性质,维持了土壤较高的孔隙度.该试验条件下,有机肥和较高水平氮肥处理辣椒产量最高,达到37.23 kg·小区-1.

Effects of Long-term Application of Manure and Nitrogen on Soil Fertility and Sweet Pepper Yield

Less and more content of soil organic matter were found in long-term application of Nitrogen and combined application of nitrogen together with manure respectively.Available Nitrogen content increased in treatment with manure and Nitrogen,while almost no obvious improvement was found in treatment with inorganic nitrogen along.Available P and K were found decreased when treated with Nitrogen.Application of manure increased available K,but had no significant effects on Available P.Long-term Nitrogen fertilization led to low pH resulting in soil acidification.Application of organic manure resulted in better chemical and physical soil properties such as pH and porosity.The highest yield hit 37.23 kg.plot-1in treatment of organic manure and high level of Nitrogen.