The effects of soil amendment on wheat yield in the Zaire-Nile Crest Highlands
Barasebwa, L. | Rutunga, V. | Kayonga, J.B. | Nkusi, J.B. (Institut des Sciences Agronomiques du Rwuanda (ISAR), Butare (Rwanda))
A soil amendment study was conducted in Gakuta region of Rwanda during the 1990B and 1992A seasons to investigate the effects of soil amendment, and to determine optimum rates. Soil amendments included were lime (at 1.5, 3 and 4.5 t/ha) and NPK 17-17-17 (at 25, 50 and 75 kg/ha). Manure was applied at 10 t/ha as a blanket treatment. The results indicated a positive response to lime. Furthermore, there was no sign of nutrient deficiency on the treatments receiving lime. On the other hand, in the control plots, the few plants that germinated exhibited a yellowish appearance. Increasing rates of NPK at low rates of lime resulted in moderate yield increases. However, yield increased by 127 to 200 per cent with NPK applied in combination with lime at 4.5 t/ha. Further studies are needed to determine whether varietal interaction is an important factor in response to soil amendments: variety adaptation trials in the same region demonstrated that some varieties had a yield potential of 2 to 3 t/ha compared to 1.3 t/ha for the variety K6661-19 used in this study
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