Table 5. Economic analysis under the different nitrogen fertilizer management strategies.
| Treatment | Seedling raising (yuan ha−1) |
Chemicals (yuan ha−1) |
Fertilizer (yuan ha−1) |
Machine (yuan ha−1) |
Irrigation (yuan ha−1) |
Labor (yuan ha−1) |
Drying (yuan ha−1) |
Cost of cultivation (Yuan ha−1) |
‡Net return (Yuan ha−1) |
‡Benefit to cost ratio |
|---|---|---|---|---|---|---|---|---|---|---|
| Control | 1,432.5 | 975 | 0 | 3,300 | 450 | 4,500 | 1,500 | 1,2157.5 | 2,537.02 e | 0.21 c |
| N100 | 1,432.5 | 975 | 2,370 | 3,300 | 450 | 6,000 | 2,025 | 1,6552.5 | 5,059.04 b | 0.31 a |
| N75+OICF25 | 1,432.5 | 975 | 2,496.8 | 3,300 | 450 | 6,000 | 2,010 | 1,6664.3 | 4,966.82 b | 0.30 ab |
| N50+OICF50 | 1,432.5 | 975 | 2,623.2 | 3,300 | 450 | 6,000 | 1,995 | 1,6775.7 | 4,332.05 c | 0.26 b |
| OICF100 | 1,432.5 | 975 | 3,519.6 | 3,300 | 450 | 4,950 | 2,055 | 1,6682.1 | 3,233.76 d | 0.19 c |
| SRCF+U | 1,432.5 | 975 | 2,958 | 3,300 | 450 | 6,000 | 2,295 | 1,7410.5 | 5,845.03 a | 0.34 a |
| CF+SCU | 1,432.5 | 975 | 3,726 | 3,300 | 450 | 5,250 | 2,085 | 1,7218.5 | 5,213.97 b | 0.30 ab |
Notes:
‡
Indicates that the value in the column is the average of 2-year experimental data.
N100, 100% conventional nitrogen (N) fertilizer (conventional compound fertilizer and urea); N75+OICF25, 75% conventional N fertilizer with 25% organic–inorganic compound fertilizer; N50+OICF50, 50% conventional N fertilizer with 50% organic–inorganic compound fertilizer; OICF100, 100% organic–inorganic compound fertilizer; SRCF+U, slow-release compound fertilizer with urea; CF+SCU, compound fertilizer with sulfur-coated urea.