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Articles by G.B. Ashiono
Total Records ( 2 ) for G.B. Ashiono
  G.B. Ashiono , S. Gatuiku , P. Mwangi and T.E. Akuja
  This study was conducted using a dual-purpose cold tolerant sorghum E1291 to determine the effect of varying rates on nitrogen (N) and phosphorus (P) on its growth and yield at KARI, Beef Research Centre, Nakuru for two seasons. The experiment was laid out in a 5x5 factorial in a Randomized Complete Block Design (RCBD). Phosphorous (P2O5) (0, 20, 30, 40 and 50 kg ha-1) was applied at sowing and N (0, 20, 30, 40 and 50 kg ha-1) applied when the seedlings were 50 cm in height. Treatment effects were determined using plant height, 1000-seed weight, Crude Protein (CP) and grain yield. Nitrogen and Phosphorous levels beyond 40 and 30 kg ha-1, respectively did not increase plant height, seed weight, crude protein and grain yield. Crude protein content in grain increased from 9.38 to 11.56%, while grain yield increased from 7 to 9 tons ha-1. The optimum sorghum grain yield was attained at 40 kg ha-1 N and 20 kg ha-1 P2O5, respectively. For crude protein the optimum was obtained at 20 N and 30 P kg ha-1, respectively. Overall, this study showed that fertilizers could enhance the production of grain sorghum (Sorghum bicolor (L) Moench) in the dry highlands of Kenya. However, the conventionally recommended rates of 88 kg ha-1 of nitrogen (N) and 94 kg ha-1 of phosphorous (P2O5) proved wasteful and excessive.
  G.B. Ashiono , W. Wasike , J.P. Ouma , S.W. Gatwiku and P.N. Gachuki
  An experiment was conducted over three years to determine the residual effects of different rates of farmyard manure on growth and yield of cold tolerant sorghum variety E1291. The trial was conducted on a sandy loam soil at the KARI-Lanet Research Centre. The manure levels were: 0, 5, 10, 15, 20, 30, 40 Mg ha-1 and inorganic fertilizer at the rate of 60 kg N and 30 kg P2O5 ha-1 applied in the first year. Grain yield increased up to 20 Mg ha-1 farmyard manure beyond which a decline was observed whereas, stover yield increased up to 30 Mg ha-1. Residual farmyard manure consistently produced better yields than inorganic fertilizer. Grain yield increases over inorganic fertilizer ranged from 7.2 to 12.6% and those for stover were 2.3 to 8.4%. Plant population increased by 0.8 to 11.3% and harvestable heads increased from 2.6 to 20%. These results have demonstrated that high and consistent yields may be produced from residual farmyard manure for three consecutive seasons after the initial application.
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