Extended Data Table 5 Coefficients of agricultural management practice to nitrogen harvest and nitrogen use efficiency of cropland for cash crops in 2007 and 2017

From: Agricultural management practices in China enhance nitrogen sustainability and benefit human health

  1. Each column represents a separate regression model. Explanatory variables include Fertilizer2, Fertilizer, Deep-placement2, Deep-placement, Manure2, Manure, Straw return; explained variables are NUEc and Nharvest. Fertilizer is nitrogen in fertilizer; Deep-placement is nitrogen in fertilizer and manure that is deep-placement divided by total; Manure is nitrogen in manure divided by summation of fertilizer and manure; Straw incorporation is nitrogen in straw recycle to cropland. The 2-corner mark represents their quadratic. Nharvest (kg N/ha) is nitrogen in harvest crops, NUEc (%) is nitrogen in harvest crops divided by nitrogen input in fertilizer. Asterisk letters indicate the statistical significance level based on P values: ***P < 0.01; **P < 0.05; *P < 0.1, which is assessed using a two-sided t-test. No adjustments were made for multiple comparisons. PAC on behalf of administrative district have been controlled in all regression equations. More details about the analysis can be found in the Methods.
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