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secondary nutrients and micronutrients fertilizers
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secondary nutrients and micronutrients fertilizers
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中微量元素肥料
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secondary nutrients and micronutrients fertilizers
中微量元素肥料
中量元素肥料和微量元素肥料的统称。与大量元素氮、磷、钾的含量相比较而言,在作物干物质组分中,钙、镁、硫的含量一般在百分之一到万分之一,称为中量元素。对于作物来说,含量介于0.2~200毫克/千克(按干物重计)的必需营养元素称为“微量元素”。
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