Research Article
The Effect of Minjingu Phosphate Rock and Triple Superphosphate on Soil Phosphorus Fractions and Maize Yield in Western Kenya
Table 7
Effect of treatments on maize grain yield (t ha−1) at Nyabeda and Khwisero.
| Treatment
| Nyabeda | Khwisero | Season | 1 | 2 | 1 | 2 |
| (1) Control | 0.95 | 0.43 | 1.13 | 0.10 | (2) Tithonia | 2.21 | 0.76 | 2.87 | 0.57 | (3) TSP + urea (50 kg P ha−1) | 3.47 | 1.58 | 3.81 | 0.94 | (4) TSP + tithonia (50 kg P ha−1) | 3.69 | 1.35 | 4.34 | 1.59 | (5) MPR + urea (50 kg P ha−1) | 3.22 | 1.63 | 3.74 | 1.11 | (6) MPR + tithonia (50 kg P ha−1) | 3.12 | 1.47 | 3.19 | 1.46 | (7) TSP + urea (250 kg P ha−1) | 6.49 | 2.95 | 5.00 | 1.71 | (8) TSP + tithonia (250 kg P ha−1) | 5.05 | 2.50 | 4.34 | 1.59 | (9) MPR + urea (250 kg P ha−1) | 4.03 | 2.28 | 5.34 | 2.02 | (10) MPR + tithonia (250 kg P ha−1) | 4.07 | 2.00 | 4.97 | 2.66 | s.e.d. | 0.50 | 0.37 | 0.61 | 0.25 | CV | 15 | 18 | 12 | 17 |
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TSP: triple superphosphate; MPR: Minjingu phosphate rock; s.e.d.: standard error of difference between means; CV: coefficient of variance.
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