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. 2021 Jul 26;16(7):e0254078. doi: 10.1371/journal.pone.0254078

Table 2. Agricultural ecological efficiency input-output index system.

Index type Sub index Variables and descriptions Computational method
Input index Labour force X1 Number of employees on farm (×104 people) Agricultural practitioners = first industry practitioners × total agricultural output value/total output value of agriculture, forestry, animal husbandry, and fishery.
Land X2 Planting area of crops (khm2) Statistical Yearbook queries
Chemical fertilizer X3 Fertilizers consumption1) (×104 t) Statistical Yearbook queries
Pesticide X4 Pesticide usage (t) Statistical Yearbook queries
Agricultural machinery power X5 Total power of agricultural machinery (×104 kW) Statistical Yearbook queries
Irrigation X6 Effective irrigation area (khm2) Statistical Yearbook queries
Output index Total output value of farm Y Total output value of farm (×108¥) Statistical Yearbook queries
Bad output index Carbon emissions U1 Total carbon emissions from fertilizers, pesticides, agricultural membranes, agricultural diesel, agricultural irrigation, and agricultural sowing (×104 t) Total carbon emissions = chemical fertilizer application × 0.90 + pesticide use × 4.93 + agricultural film use × 5.18 + agricultural diesel use × 0.59 + effective irrigation area × 20.48 + total crop area sown × 312.60
Pollution emissions U2 Quantity of chemical fertilizer, pesticide, total residues of agricultural membrane (×104 t) Total pollution emissions = chemical fertilizer application × 0.65 + pesticide use × 0.50 + agricultural film use × 0.10