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Articles by E. Arkorful
Total Records ( 2 ) for E. Arkorful
  B. Karikari , E. Arkorful and S. Addy
  Phosphorus is a major limiting nutrient in soils in Ghana. Selection of cowpea varieties that produce good seed yield under low soil phosphorus or those with high phosphorus response efficiency can be a low input approach in solving this problem in Ghana. Two seasons experiments were conducted to evaluate influence of phosphorus (P) fertilizer on growth, nodulation and yield in cowpea. The experiment comprised 12 treatment combinations of 3 cowpea varieties and 4 levels of triple super phosphate (46% P2O5) laid out as a factorial in RCBD with four replications. The cowpea varieties were Asetenapa (IT81D-1951), Asomdwee (IT94K-410-2) and IT89KD-347-57 and levels of P were 0, 20, 40 and 60 kg ha–1 P2O5. In the present study, Asomdwee and IT89KD-347-57 recorded the highest and lowest crop growth of 7.88 and 2.02 g m–2 day–1 at 45 and 60 days after planting, respectively. Growth rate was not consistent with P application; however, application rate of 60 kg ha–1 P2O5 yielded the least growth rate in the entire study period except for 60 days after planting in the minor season. Statistically, Asetenapa and Asomdwee recorded similar number, effectiveness and dry weight of nodules and were significantly different from that of IT89KD-347-57 in both seasons. Number, effectiveness and dry weight of nodules in all varieties were directly proportional to rates of P fertilizer application in both seasons. Asomdwee produced the highest seed yield of 1557.00 and 1415.00 kg ha–1 for major and minor seasons, respectively. The rate of P fertilizer application was directly proportional to the seed yield in all three cowpea varieties. The highest seed yield of 1682.00 and 1476.00 kg ha–1 for major and minor seasons, respectively was produced at 60 kg ha–1 P2O5 application. Farmers are, therefore, encouraged to use P fertilizer in cowpea production in Ghana.
  B. Karikari and E. Arkorful
  Dry matter production and its partition are the best measure and index of the total performance and response of a crop to growth conditions. Two-season experiment was conducted in soil with low available phosphorus (P) to study dry matter production and partitioning among the cowpea plant as influenced by either variety or phosphorus application using triple super phosphate (46% P2O5). In the present study IT89KD-347-57 consistently produced the highest number of leaves. The number of leaves per plant did not differ significantly (p>0.05) with phosphorus application; however, 60 kg ha–1 rate consistently yielded the greatest number of leaves. Asomdwee and Asetenapa recorded the highest and lowest leaf area of 1731.22 and 769.27 cm2, respectively. Leaf area also increased consistently with P application, with 20 kg ha–1 been the optimal rate for greater leaf area. However, leaf area did not differ significantly (p>0.05) with P application. Net assimilation rate was not significantly influenced by P and therefore, 0 kg ha–1 rate yielded the highest NAR. Dry matter production increased with age of plant regardless of the levels of P applied, with 60 kg ha–1 yielding the mean highest value. Dry matter accumulation in the stem was consistently higher than the remaining plant parts regardless of the levels of P applied. However, dry matter production and partitioning among above ground parts were significantly (p<0.05) affected by cowpea variety but not P application. The results in this study indicate that dry matter production among cowpea is totally dependent on varietal differences but not phosphorus application.
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