The content of exchangeable Al increased with the amount of applied nitrogen as urea.
2
红壤长期施用单一化学肥料，土壤明显酸化，土壤交换性氢铝显著增加，作物生长变差，产量降低。
The soil became acid obviously, the exchangeable al in soil increased significantly, crop grew poorly and the yield decreased after applying sole chemical fertilizer for long term.
3
研究结果表明，氢离子输入土壤后可以转化为表面正电荷、可溶性铝和可交换性酸。
The results showed that the input of hydrogen ions into soils could transform into positive charges, soluble Al and exchangeable acidity.
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