旱地长期定位施肥土壤水氮资源利用的研究

Utilization of soil water and nitrogen resources in dry land under a long-term fertilizer experiment

摘要: 黄土高原旱地长期定位施肥N素利用率及作物对土壤深层储水利用试验研究结果表明，旱地长期施用N肥利用效率较高，平均为47．9％，0～100cm土层土壤NO₃^--N含量对作物生长有效，高N 肥投入可提高作物产量和利用更多的土壤储水。该区土壤对水分有很大调节作用，土壤水库具有很大的抗旱增产潜力。

Abstract: Utilization rate of nitrogenous fertilizer and use of deep storage water are studied on the base of a long-term located fertilizer test in this paper．The results show that utilization rate of N is higher in dry land．Lots of N may increase the production and reduce the storage of water．Soil moisture is adjusted by soil reservoir greatly，which is important in drought region．