黄土母质生土地不同施肥对作物产量的影响

Effects of Diffrent Fertilizers Applied to The Crop Yields in Loess Parent Material Immature Soil

研究表明不论深层生土或浅层生土，当年施用足够量的氮磷钾配合肥，特别是与一定量有机肥配合都可较对照生土不施肥成倍地提高产量，生土地上单独施用不同肥料效果甚低，其对产量影响的排序为：有机肥＞Ｐ＞Ｋ或Ｎ，Ｎ与Ｋ差异不大，生土地施用黑矾无明增产效果。

Results of study shows that the application of sufficient amount of mixtures of nitrogen, phospherous and potassium fertilizers especially together with organic fertilizers to wheat and red pea, in either deeper or shallow soil layers of loess paent material immature soil giue significant increased of yield than the checks, yield decreased signicantly whenever the fertilizers applied separatily in the order:organic fertilizer>P>K>N>CK, and there is no effect by applying Feso 4.