长期灌溉施肥对半干旱区褐土氮、磷和钾库的影响

采用二次回归通用旋转组合设计 ,在辽西半干旱区进行了长期田间试验 ,研究灌水、施氮、施磷和施秸秆对土壤氮素含量的影响。结果表明 ,灌水在促进作物生长和提高产量的同时 ,使得土壤中的全氮和水解氮含量有所降低 ,施氮肥能够提高土壤中的氮素含量 ,土壤氮素含量随着磷肥施用量的增加先降低后增加 ,施秸秆能显著提高土壤氮素含量特别是水解氮含量。因此 ,秸秆施用是保持和提高土壤氮素营养的有效措施。

Effect of long-term irrigation and fertilization on nitrogen,phosphorous,and potassium pools of cinnamon soil in semi-arid area I.Effect on nitrogen pool of cinnamon soil farmland

With quadratic regression general rotation design,a long-term field trial was carried out in the semi-arid area of western Liaoning,to study the effects of irrigation and fertilization on soil nitrogen pool.The results showed that the contents of soil total nitrogen and hydrolyzable nitrogen can be reduced by irrigation.Soil nitrogen content was increased by the application of N fertilizer.Soil nitrogen content declined at first and then increased with the increasing application of phosphorous fertilizer.Soil nitrogen,especially hydrolyzable nitrogen,was remarkably improved with straw mulching application.Therefore,straw mulching is an efficient measure to maintain and improve the regime of soil nitrogen nutrition.