前几年、我区有相当部分果园长期偏施氮肥,出现树势衰弱,叶片黄化,产量不高,品质变劣。1988—1990年我们在柑桔上开展了试用复混肥的试验和示范,不仅可使柑桔树势增强,防止黄化花叶,而且可使产量增加30—80％,座果率提高0.5-9.01％,成本相应降低20％以上,投资收益比为1:12.5;果实颜色普遍变好,含糖量增加,倍 A few years ago, a considerable part of our region has long been partially nitrogenous fertilizers orchards, the emergence of frailty, yellow leaves, yield is not high, the quality of the worse. From 1988 to 1990, we experimented and experimented on the application of compound fertilizers on citrus fruits, which not only enhanced citrus tree vigor and yellowing mosaic flowers, but also increased the yield by 30-80% and the fruit set rate by 0.5-9.01 %, The corresponding cost reduction of more than 20%, investment income ratio of 1: 12.5; fruit color generally better, increased sugar content, times