Fig 1.
Influence mechanism of the OSCF policy on chemical fertilizer use.
Table 1.
Descriptive statistics of main variables.
Table 2.
Benchmark regression results.
Table 3.
The results of the robustness test.
Table 4.
Results after excluding the effect of other policies on chemical fertilizer use.
Table 5.
The results of the falsification test.
Fig 2.
Parallel trend test.
Table 6.
Heterogeneity analysis results.
Table 7.
Mechanism test results.
Fig 3.
Feature importance.