摘要
坡耕地１２年长期施肥结果表明：产量对长期施肥反映明显，施氮肥效果不显著，施磷肥效果较好，ＮＰ配合效果更佳，有机肥与Ｎ或ＮＰ配施，可大幅度提高产量。在长期施肥水平较低情况下，随着施肥时间的延长，轮作周期内产量、作物吸Ｎ、Ｐ量均呈递减趋势，可用ｙ＝α＋ｂｌｏｇｔ方程拟合，其参数ｂ均为负值，ｂ值的大小，反映出不同肥料对土壤肥力衰减程度。施Ｎ处理作物吸Ｎ量与吸Ｐ量相当，说明土壤中缺Ｐ素，严重限制了作物对磷的吸收。表明在Ｐ素极缺的黄绵土上，增施磷肥的重要性．
The results of 12 years long-term applying fertilizer in slope farmland show the longterm applying fertilizer effect on yield is very obvious,effect of applying N is not obvious,effects of applying P is better,and organic matter mixed N or NP may enhance crop yield obviously. As applying fertilizer's time goes on,crOP yield and absorbing N. P are reduced step by step as lower applying-fertilizer level in a rotation period of crops, this reducing tendency may be fitted by y=α+blogt, these paramere b values become negative number, b values affect soil nutrient declining situation as different fertilizer as well. That absorbing N level is corresponded to absorbing P of crop as applying N, show soil lacked P prevents crop absorbing P from soil, as proved P fertilizer should be increased in loess soil.
出处
《水土保持研究》
CSCD
1996年第2期13-17,共5页
Research of Soil and Water Conservation
