【摘要】 将 1 mmol/L草酸 (p H=6 .0 )加入到 4种难溶性含磷化合物 (Fe PO4 、Ca HPO4 、Al PO4和磷矿粉 )的水溶液中 ,其溶出磷的含量均显著提高 ,溶磷量随着反应时间的延长首先增大 ,然后有所下降。水培条件下大豆利用磷矿粉中磷的能力很差 ,加入 1 mmol/L草酸 (p H=6 .0 )能促进大豆对磷矿粉中磷的吸收利用 ,表明草酸可能通过螯溶磷矿粉中的磷而提高了其有效磷的含量。 2 0 0μmol/L铝离子能显著抑制大豆根的生长 ,而 6 0 0μmol/L草酸能基本解除其抑制作用更多还原

【Abstract】 When oxalate (1 mmol/L,pH=6.0) was added to the solution containing insoluble phosphates (FePO 4,CaHPO 4,AlPO 4) and phosphate rock,the amount of soluble P was significantly increased,indicating that oxalate promoted the release of P from insoluble phosphates and phosphate rock.Soybean plants may not efficiently utilize the P from phosphate rock.When oxalate was supplied together with phosphate rock in the culture solution,the P uptake and the growth of plants were significantly increased. Application of 200 μmol/L Al 3+ to the culture solution caused significant reduction in root elongation.Oxalate (600 μmol/L) was very effective to detoxify the aluminum toxicity to soybean plants.更多还原