三、 Soil acid- alkali and redox with nutrient organisms effectively () Influence of soil acid-alkali to nutrient effectively D五 Ca &z Mg e,Mn, zn. Cu, Co MO B 图95植物营养元素的有效性 与pH的关系二、 Soil acid-alkali and redox with nutrient organisms effectively （一) Influence of soil acid-alkali to nutrient effectively