For criteria having negative impact, use reciprocal value to determine score.
对于每个有负面影响的标准，使用倒数确定其分值。
There is the reward decrement relationship between K amounts from organic and inorganic fertilizer and yield of virus-free potato, and the reciprocal effect presents a negative value.
在满足氮、磷营养元素需求的前提下，有机肥与无机肥所含的钾，对脱毒马铃薯产量均呈报酬递减率关系，交互效应呈负值。
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