褐土土壤养分变化及施肥效果探讨

摘要

以褐土土类为研究对象,探讨长期定点不施肥对土壤养分含量及作物产量的影响。结果表明,长期不施肥对土壤有机质、全氮、碱解氮、有效磷、速效钾都有明显的降低,且随年份的推后,降低幅度越大;长期不施肥可使小麦、玉米大幅度减产,但到达一定年份后无肥区产量趋于稳定。%The effects of no fertilization on soil nutrients and crop yield in brown soil in Tangyin County were studied.The result of long-term location test showed that without fertilization the content of soil nutrients declined obviously such as organic matter,total N,alkalytic N,available P and available K,and as time went on,it declined at more degree.The yield of wheat and corn was reduced greatly,production of no fertilization was steady when reaching certain year.