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Agyei, B. , Bayor, H.. "Effect of Poultry Manure and Nitrogen, Phosphorus, and Potassium (15:15:15) Soil Amendment on Growth and Yield of Carrot (Daucus carota)". World Academy of Science, Engineering and Technology, Open Science Index 122, International Journal of Agricultural and Biosystems Engineering, (2017), 11(2), 124 - 129.