... 单一肥料straightfertilizer 主要养分macro-nutrient;primarynutrient 次要养分secondarynutrient[element] ...
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macro-nutrient salts 大量营养元素
N any substance, such as carbon, hydrogen, or oxygen, that is required in large amounts for healthy growth and development 大量营养素; 碳、氢或氧等为健康成长和发展所大量需求的物质
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