【摘要】 本文以长期定位试验为基本材料，研究了１２年连续施用有机肥及化肥对土壤中Ｚｎ、Ｍｎ、Ｆｅ、Ｃｕ丰缺的影响。结果表明，有机肥是Ｚｎ、Ｆｅ、Ｃｕ的良好肥源，长期施用，使有效量比全量，上层比下层增加显著，上层有效Ｚｎ由０．２提高到１．６ｍｇ／ｋｇ，提高８倍；有效Ｆｅ由５．３２提高到８．７２ｍｇ／ｋｇ，增加了６３．９％；有效Ｃｕ由１．１４提高到１．３４ｍｇ／ｋｇ，增加１７．５％。增施有机肥及化肥，促进作物对Ｚｎ、Ｍｎ、Ｆｅ、Ｃｕ的吸收，提高了作物产量；同时，由于有机肥及根茬腐解，降低了土壤ｐＨ值，促进土壤全Ｚｎ、Ｆｅ、Ｍｎ的分解与矿化，使其转化为有效成分。更多还原

【Abstract】 Effects of long- term application of organic manure and chemical fertilizer onthe contents of Zn, Mn, Fe and Cu in soil were studied.The results show that theorganic manure is a good resource of Zn,Fe and Cu. After long-term applicationof organic manure,the available Zn increased 8 times from 0.2 to 1.6mg/kg,avai-lable Fe increased bv 63.9% from 5.32 to 8.72 mg/kg; and available Cu increasedby 17.5% from 1.14 to 1.34 mg/kg. Part of increased nutrients came from organicmanure,and part from the decomposition and mineralization of soil Zn,Fe andMn because the soil pH was decreased due to the decay of organic manure androots. Correlation coefficients of pH decrease and available Zn and Fe increase were -0.907 and -0.98 1 respectively,while correlation coefficients of pHdecrease and total soil Fe and Mn decrease were 0.864 and 0.791 respectively,showing a close correlation between the availability of Zn,Fe and Mn and the pHof Soil.更多还原