以下为句子列表：
英文: Chapter 15 Micronutrients and micronutrient fertilizers. Boron, copper, Mo, Mn and their physiological roles and deficiency symptoms. their forms and their availability in soil. Common iron fertilizers and effective usage.
中文: 第十五章微量元素肥料主要讲授微量元素硼、铜、钼和锰等的生理功能和营养作用，缺素症状；土壤中4种微量营养元素的形态、转化及其有效性；微肥的合理施用。
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