近年来,我们在已经衰老了的柑桔园,挖掉柑株,改种大豆或其他豆科作物。发现凡是种在原柑桔穴位的豆科作物,生长甚差,植株矮小,叶缘黄化焦枯,叶肉斑疤坏死;根群发育差,根呈黑褐色,没有根瘤或根瘤很少。我们认为这可能与土壤酸化有关,土壤酸化可能是导致柑桔早衰的原因之一。为此,1978年开始探讨这一问题。 促使果园土壤酸化的因素很多。如降雨量大,造成盐基的大量流失。施用过多酸性肥料或未腐熟 In recent years, we have dredged citrus trees, re-planted soybeans or other leguminous crops in an already aging citrus orchards. Found that all kinds of legumes grown in the original citrus points, very poor growth, short plants, leaf marginal yellow scorch, leaf scar necrosis; root group development is poor, dark brown root, no nodules or few nodules. We think this may be related to soil acidification, soil acidification may be one of the reasons leading to premature aging of citrus. To this end, 1978 began to explore this issue. Promote the orchard soil acidification of many factors. Such as heavy rainfall, resulting in a large loss of base. Apply too much acidic fertilizer or not decomposed