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经济施肥 economic fertilization
时间：2022-01-10 18:31
关键词：
土壤学
农学
大学试题
答案解析
<p> 以取得最大利润额和利润率为目的的施肥措施。前者根据肥料效应函数，当边际利用等于零时算出；后者则按边际利润率等于零时算出。</p>
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