以下为句子列表：
英文: Because of alkaline calcareous nature of soils, availability of micronutrient is a problem, particularly Zn in rice soils, Cu and Zn in citrus and Fe in apples.
中文: 因碱性石灰性土壤的特性，微量养分有效性不高，特别是水稻土中缺锌，柑桔园中缺铜缺锌和苹果园中缺铁。
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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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英文: Copper is a micronutrient that serves as an essential factor to all organisms.
中文: 摘要铜是各种生物都必需的一种微量元素。
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英文: Deficiency disease A disease caused by deficiency of a particular essential nutrient (such as a MICRONUTRIENT or trace element), usually with a characteristic set of symptoms.
中文: 营养缺乏病：由于缺乏一种特殊的必要营养物质（微量营养素或微量元素）而导致的疾病，通常表现出具有特征性的一系列症状。
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英文: Iron A MICRONUTRIENT essential for plant growth.
中文: 铁：是植物生长所必须的微量元素。
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