Table 2.
Baseline and control group nutrient application rates, nutrient use efficiency, maize yield and GHG emissions, and recommended nutrient rates from extension treatment interventions.
| Panel A: 2016–2017 |
Panel B: 2016–2018 |
|||||||
|---|---|---|---|---|---|---|---|---|
| C |
T1 |
T2 |
C |
T1 |
T2 |
|||
| 2016 | 2017 | 2016 | 2016 | 2018 | 2016 | |||
| Fertilizer management practices | 0.300 | 0.268 | 0.302 | 0.269 | 0.285 | 0.267 | 0.267 | 0.291 |
| (0.031) | (0.03) | (0.030) | (0.029) | (0.030) | (0.03) | (0.030) | (0.031) | |
| N rate (kg/ha) | 62.19 | 74.88*** | 57.77 | 58.77 | 62.13 | 68.05* | 59.58 | 60.03 |
| (3.22) | (3.18) | (3.10) | (3.09) | (3.19) | (2.45) | (3.33) | (3.33) | |
| Nutrient rate (kg/ha) | 102.9 | 121.6*** | 92.58 | 96.4 | 102.08 | 115.8** | 94.73 | 99.04 |
| (4.40) | (5.40) | (4.21) | (4.43) | (4.40) | (3.97) | (4.47) | (5.06) | |
| NUE (kg output/kg N) | 66.48 | 41.91*** | 63.59 | 68.82 | 65.73 | 39.55*** | 60.66 | 69.09 |
| (4.92) | (2.10) | (4.52) | (4.63) | (4.83) | (66.08) | (4.58) | (4.79) | |
| NuUE (kg output/kg nutrient) | 34.02 | 25.55*** | 34.80 | 35.18 | 34.01 | 23.38*** | 32.56 | 35.61 |
| (2.13) | (1.217) | (2.21) | (2.13) | (2.31) | (0.898) | (2.16) | (2.20) | |
| Yield (kg maize/ha) | 2,118 | 2,202 | 2,010 | 2,085 | 2,127 | 2,243** | 1,961 | 2,108 |
| (64.07) | (58.10) | (59.09) | (62.93) | (61.07) | (51.61) | (60.08) | (64.10) | |
| Net revenue (NGN / ha) | 147,342 | 127,257** | 139,906 | 145,494 | 148,247 | 115,888*** | 132,653 | 146,525 |
| (7,398) | (5,555) | (6,886) | (6,937) | (7,082) | (5,231) | (6,949) | (7,261) | |
| GHG emission (kg CO2 eq./ha) | 828.3 | 1,012*** | 790.5 | 811.9 | 824.4 | 935.1*** | 797.7 | 819.9 |
| (34.69) | (43.03) | (33.56) | (37.04) | (34.74) | (32.63) | (35.45) | (38.26) | |
| GHG emission intensity (kg CO2 eq./ton maize) | 502.5 | 507.4 | 516.7 | 488.2 | 473.0 | 437.9 | 525.6 | 478.4 |
| (32.70) | (24.96) | (34.67) | (35.56) | (27.52) | (14.27) | (35.15) | (31.34) | |
| Recommended N application (kg/ha) | 120 | 129.0*** | 128.6*** | 120 | 132.0*** | 134.9*** | ||
| – | (1.50) | (1.29) | – | (1.48) | (1.64) | |||
| Recommended nutrient application (kg/ha) | 240 | 241.6 | 234.8 | 240 | 250.9*** | 247.1** | ||
| – | (4.66) | (4.01) | – | (3.76) | (4.23) | |||
| Sub-sample size after attrition | 220 | 220 | 240 | 230 | 221 | 221 | 225 | 220 |
Standard errors reported between parentheses. Significant mean differences between C 2016 - C 2017, C 2016 - C 2018, C-T1 and C-T2 indicated as 1% ***, 5% ** and 10% * significance levels.