Research Article
Growth and Nutrient Use Efficiencies of Yams (Dioscorea spp.) Grown in Two Contrasting Soils of West Africa
Table 3
Impact of soil type and fertilizers on tuber yields and harvest index (HI) of Dioscorea spp.
| Soil type | Species | Fertilizer | Yield (t fresh matter/ha) | Harvest indices |
| Forest | D. alata | None | 28 | 0.96 | Full rate | 35 (25%)** | 0.93 | D. rotundata | None | 13 | 0.99 | Full rate | 15 (15%)** | 0.96 | | | P values | Species | | < 0.0001 | 0.0399 | Fertilizer | | 0.1764 | 0.0263 | Species × fertilizer | | 0.4376 | 0.8682 |
| Savanna | D. alata | None | 17 | 0.88 | Full rate | 29 (71%)** | 0.90 | D. rotundata | None | 8 | 0.93 | Full rate | 11 (38%)** | 0.97 | | | P values | Species | | 0.0037 | 0.0135 | Fertilizer | | 0.0981 | 0.1598 | Species × fertilizer | | 0.2458 | 0.6461 | SE mean () | | | 3.5 | 0.17 |
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**Numbers in parenthesis indicate the increase/reduction in tuber yield in relation to the nonfertilized plots.
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