. 2021 Dec 23;19(1):111. doi: 10.3390/ijerph19010111

Table 1.

Evaluation index system of the CLUE.

Variable Type	Variable	Index Meaning
Input index	Cultivated land input	Actual sown area of crops/1000 hm²
	Labor input	Number of employees in the primary industry × (agricultural output value/total output value of agriculture, forestry, animal husbandry, and fishery)/10,000
	Pesticide and fertilizer input	Net amount of pesticide and chemical fertilizer application/t
Expected output index	Agricultural output value	Output value of the planting industry/10,000 yuan
Expected output index	Grain yield	Total grain output/t
Unexpected output index	Net carbon emissions	Difference between the total carbon emissions of mechanical operation and chemical fertilizer and pesticide application and the total carbon absorption of cultivated land/t