对黄土地区黄化和非黄化的果园不同深度土壤性状进行分析,结果表明:在对黄化有显著影响的因素中,不同土壤性状对黄化的影响的主要深度不同,但大多数土壤性状在两类果园土壤间都在40～60cm差异显著性达到0.01水平。果园土壤施肥量增大,导致氮磷钾等养分与铁比例失调是近年来黄土地区果树黄化加重的重要原因。 The results showed that among the factors that significantly affected the yellowing, the main depth of influence of different soil characters on the yellowing was different, but most of the soil characters In the two types of orchard soil between 40 ~ 60cm significant difference reached 0.01 level. Orchard soil fertilization increases, resulting in nitrogen and phosphorus and other nutrients and iron imbalance in the loess area in recent years, an important reason for the yellowing of the aggravated.