《Table 5 Statistical characteristics of marginal net income data under different chemical fertilizer

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《Benefit Analysis of Chemical Fertilizer Input for Staple Grain Production Based on Threshold Panel Data Model》

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Similarly，we tested the relationship between chemical fertilizer productivity and marginal net income.We first analyzed the covariance coefficient of the two，the value is 0.76，indicating that there is a strong positive relationship between them.As shown in Table 4，from the statistical characteristics of mean，minimum，maximum values，etc.，when the chemical fertilizer productivity of wheat is increased，the marginal net income of grain is also greatly increased.