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采用８年肥料定位试验，研究有机肥对植株和土壤中Ｚｎ、Ｍｎ、Ｃｕ平衡状况的影响．结果表明，随有机肥用量增加，小麦、玉米籽粒和秸秆中Ｚｎ、Ｍｎ、Ｃｕ的含量降低．每年施用 ３２． ７５ ｋｇ／ｈｍ２ Ｐ和 ３７．５ ｔ／ｈｍ２有机肥，其中的有效 Ｚｎ和 Ｃｕ不能补偿一年两熟的作物携出，有效Ｍｎ有余．土壤对Ｚｎ、Ｍｎ、Ｃｕ的供应有相当的自动调节能力．土壤中３种元素的理论盈亏量和实际消长量之间有显著的相关性．
8-year fertilizer experiment was conducted to study the effects of organic manure on the balance of Zn, Mn and Cu in plants and soil. The results showed that the content of Zn, Mn and Cu in wheat, corn grain and straw decreased with the increase of organic manure. Apply 32 per year. 75 kg / hm2 P and 37.5 t / hm2 organic fertilizers, of which the effective Zn and Cu can not compensate for the crop two crops a year, effective Mn more than. The supply of soil Zn, Mn, Cu has a considerable ability to automatically adjust. There was a significant correlation between the theoretical profit and loss and the actual growth of three elements in soils.