Outcome comparisons between smallholders from STB and non-STB villages
| All sampled householdsa | Households from the pilot countyb | Households from all non-STB villages | Mean differences | |||
|---|---|---|---|---|---|---|
| STB villages | Non-STB villages | Mean differencesc | ||||
| (1) | (2) | (3) | (4) = (2)–(3) | (5) | (6) = (2)–(5) | |
| Household wheat production | ||||||
| # of wheat farmers | 1955 | 194 | 208 | 402 | 1761 | 1955 |
| # of wheat farmers with NUE data | 1,054 | 115 | 111 | 226 | 939 | 1,054 |
| 1. Yield, kg−1 ha | 7,161 [937] | 7,412 (73) | 6,912 (119) | 500*** (137) | 7,133 (37) | 279*** (79) |
| 3. Nitrates use efficiency (NUE), kg−1 kg | 27.95 [13.61] | 31.41 (1.07) | 31.53 (1.83) | −0.13 (2.08) | 27.52 (0.63) | 3.88*** (1.21) |
| 5. Phosphorus use efficiency (PUE), kg−1 kg | 52.71 [18.42] | 56.33 (2.81) | 49.97 (1.88) | 6.36* (3.32) | 52.27 (0.82) | 4.06 (2.84) |
| 7. Potassium use efficiency (KUE), kg−1 kg | 53.24 [19.74] | 57.76 (3.06) | 49.95 (1.84) | 7.82** (3.50) | 52.69 (0.86) | 5.08 (3.07) |
| Household maize production | ||||||
| # of maize farmers | 1950 | 194 | 205 | 399 | 1756 | 1950 |
| # of maize farmers with NUE data | 1,053 | 116 | 110 | 224 | 937 | 1,053 |
| 9. Yield, kg−1 ha | 8,036 [1,379] | 8,127 (102) | 7,617 (113) | 510*** (150) | 8,026 (47) | 101 (109) |
| 11. Nitrates use efficiency (NUE), kg−1 kg | 55.04 [27.95] | 58.35 (3.93) | 53.70 (3.17) | 4.65 (4.96) | 54.63 (1.18) | 3.71 (3.97) |
| 13. Phosphorus use efficiency (PUE), kg−1 kg | 69.18 [20.66] | 74.37 (2.13) | 66.49 (2.69) | 7.88** (3.38) | 68.55 (0.88) | 5.82** (2.24) |
| 15. Potassium use efficiency (KUE), kg−1 kg | 69.67 [21.32] | 75.90 (2.33) | 67.17 (2.71) | 8.73** (3.51) | 68.92 (0.89) | 6.98*** (2.41) |
| All sampled householdsa | Households from the pilot countyb | Households from all non-STB villages | Mean differences | |||
|---|---|---|---|---|---|---|
| STB villages | Non-STB villages | Mean differencesc | ||||
| (1) | (2) | (3) | (4) = (2)–(3) | (5) | (6) = (2)–(5) | |
| 1. Yield, kg−1 ha | 7,161 [937] | 7,412 (73) | 6,912 (119) | 500*** (137) | 7,133 (37) | 279*** (79) |
| 3. Nitrates use efficiency (NUE), kg−1 kg | 27.95 [13.61] | 31.41 (1.07) | 31.53 (1.83) | −0.13 (2.08) | 27.52 (0.63) | 3.88*** (1.21) |
| 5. Phosphorus use efficiency (PUE), kg−1 kg | 52.71 [18.42] | 56.33 (2.81) | 49.97 (1.88) | 6.36* (3.32) | 52.27 (0.82) | 4.06 (2.84) |
| 7. Potassium use efficiency (KUE), kg−1 kg | 53.24 [19.74] | 57.76 (3.06) | 49.95 (1.84) | 7.82** (3.50) | 52.69 (0.86) | 5.08 (3.07) |
| 9. Yield, kg−1 ha | 8,036 [1,379] | 8,127 (102) | 7,617 (113) | 510*** (150) | 8,026 (47) | 101 (109) |
| 11. Nitrates use efficiency (NUE), kg−1 kg | 55.04 [27.95] | 58.35 (3.93) | 53.70 (3.17) | 4.65 (4.96) | 54.63 (1.18) | 3.71 (3.97) |
| 13. Phosphorus use efficiency (PUE), kg−1 kg | 69.18 [20.66] | 74.37 (2.13) | 66.49 (2.69) | 7.88** (3.38) | 68.55 (0.88) | 5.82** (2.24) |
| 15. Potassium use efficiency (KUE), kg−1 kg | 69.67 [21.32] | 75.90 (2.33) | 67.17 (2.71) | 8.73** (3.51) | 68.92 (0.89) | 6.98*** (2.41) |
Note(s): aIn column 1 we report the mean of each outcome variable and its standard deviation in brackets. In columns 2, 3 and 5 we report the mean value of each outcome variable and its estimated village-clustered standard errors; bGiven that all STB villages were located in one pilot county, we first conduct a descriptive comparison over each outcome within the pilot country between STB villages and non-STB villages. However, given the limited number of sampled villages within the pilot county, the remaining regression analysis will only be conducted with all sampled villages (column 5); cMean differences were calculated by running a series of t-tests, and the standard errors were calculated using a village-clustered robust standard errors for inference, ***p < 0.01, **p < 0.05, *p < 0.1
Source(s): Authors' survey in 2018
Sharing content requires targeting cookies to be enabled. Please update your cookie preferences to use this feature.