前言日本柑桔产区的降雨频繁加之重施化肥,土壤酸性强。在这种强酸性土壤上.温州蜜柑的生长受到抑制,成为日本柑桔业的严重问题。因此,在不降低柑桔园土壤PH值的前提下如何适当施肥已成为现今讨论的重要问题。减少施肥量(尤其是减少氮素肥料用量)可能不会降低土壤PH值,但产量下降;多施氮肥可能增加产量,但使土壤PH值下降,果品质量差。 Preface The citrus growing areas in Japan coupled with frequent heavy rainfall fertilization, soil acidity. In this strongly acidic soil, the growth of Satsuma mandarin is inhibited, becoming a serious problem for Japanese citrus industry. Therefore, how to properly fertilize without reducing the pH value of citrus orchard soil has become an important issue for discussion. Reduce the amount of fertilizer (especially the amount of nitrogen fertilizer) may not reduce the soil PH value, but the yield decreased; more nitrogen fertilizer may increase the yield, but the soil PH value decreased, the poor quality of the fruit.