《Table 4 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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Through testing the relationship between chemical fertilizer productivity and marginal net income，the covariance of the two is0.88，indicating a strong positive relationship between the two.For comparison purposes，we listed the statistical characteristics of the marginal net income data for different thresholds，as shown in Table 4.From the statistical characteristics of mean，minimum，maximum values，etc.，when the chemical fertilizer productivity is lifted to a new stage，the marginal net income per unit of chemical fertilizer has been significantly improved.