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在京郊平原机械化规模经营条件下，对不同施肥方法与产量的相关关系研究表明，磷肥集中施于冬小麦比分施于两作物有显著的增产作用。夏玉米拔节期一次追肥比在拔节和大喇叭口期两次追肥的产量要低。Ｎ、Ｐ、Ｋ化肥中任何两种化肥配施的基础上，增施剩余一种化肥的增产量、增产率、单位肥料增产量均表现为：冬小麦是Ｐ合＞Ｐ分＞Ｎ＞Ｋ；夏玉米是Ｎ＞Ｐ合＞Ｋ，而Ｐ分却是负增长；两茬作物是Ｐ合＞Ｎ＞Ｋ＞Ｐ分。
Under the condition of mechanized scale operation in the suburbs of Beijing, the research on the relationship between different fertilization methods and yield shows that the concentration of phosphate fertilizer applied to winter wheat significantly increased the yield of two crops. Summer corn jointing period of a top dressing than in the jointing and big bell mouth twice the top dressing yield is lower. N, P, K fertilizers on the basis of any two kinds of chemical fertilizers, increase the remaining one kind of chemical fertilizer yield, yield, fertilizer yield per unit showed: winter wheat P P> P> N> K; Summer corn is N> P co> K, while P is negative growth; crop two crops is P co> N> K> P points.