Table 5.
Mean annual revenues, costs, and net profits from potassium treatments (2018 and 2019).
| Treatment | Total revenue | Fertilizer costs | Labor cost | Other costs | Net profit | Change vs. Control (%) | |||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | 2019 | ($ ha−1 year−1) | 2018 | 2019 | 2018 | 2019 | |||
| Control | 5,340 | 4,863 | 190 | 3,000 | 721 | 1,429 | 953 | – | – |
| CRK × FA90 | 6,580 | 6,207 | 368 | 3,300 | 721 | 2,191 | 1818 | 53 | 91 |
| CRK × FA180 | 6,994 | 6,844 | 387 | 3,300 | 721 | 2,586 | 2,436 | 81 | 156 |
| CRK × FA270 | 6,712 | 6,560 | 407 | 3,300 | 721 | 2,284 | 2,133 | 60 | 124 |
| KS × FA90 | 6,204 | 5,851 | 403 | 3,300 | 721 | 1780 | 1,427 | 25 | 50 |
| KS × FA180 | 6,590 | 6,154 | 423 | 3,300 | 721 | 2,147 | 1711 | 50 | 80 |
| KS × FA270 | 6,198 | 5,850 | 442 | 3,300 | 721 | 1736 | 1,387 | 21 | 46 |
Mean prices of fertilizers and other non-labor expenses in China (United States dollars per metric ton): polymer-coated potassium chloride $485.6, potassium sulfate $540.1, calcium superphosphate $149.3, urea $238.8, and cotton $1347.2. Other costs included machinery, plastic film, irrigation, pesticides, insecticides, seeds, and other materials and services. Mean cost of labor in China: $12.80 for one employee/day/ha. Control, no potassium fertilizer; CRK, polymer-coated potassium chloride; and KS, sulfate potassium.