锰是植物正常生长不可缺少的微量元素之一,它在植物光合作用、氮的代谢和氧化还原过程中起重要作用。作物所需的锰主要由土壤供给。我县土壤多属黄泛冲积土,石灰含量较高,偏碱性。据中国科学院南京土壤研究所在我县张集孟庄等地测定,土壤耕层中有效态锰的含量远远低于植物正常生长所需数量。张集公社三年来所进行的田间试 Manganese is one of the trace elements essential for the normal growth of plants. It plays an important role in plant photosynthesis, nitrogen metabolism and redox processes. The manganese needed for the crop is mainly supplied from the soil. Most of my county soil yellow alluvial soil, lime content is high, alkaline. According to the Nanjing Institute of Soil Science, Chinese Academy of Sciences in Zhang County, Zhang County and other villages measured, soil available plow level of manganese is far below the normal growth of plants required number. Zhangji commune three years in the field trial