keywords: Chemical properties, major nutrients, vines, yam tubers
Two field experiments were conducted at the Teaching and Research Farm of Agricultural Science Department, Adeyemi College of Education, Ondo Southwestern Nigeria in 2014 and 2015 to compare the effect of organic, organomineral and mineral fertilizers on soil properties, growth and yield of yam. The treatments used were 10 t/ha each of Wood Ash (WA) Cattle Dung (CD), Poultry Manure (PM), Manufactured Organic Fertilizer (OG) and Organomineral fertilizer (OMF); 400 kg/h each of NPK 15:15:15, Single Super Phosphate (S.S.P), Urea and Muriate of Potash (MOP). The treatments were laid out in randomized complete Block Design and replicated three times. Compared with control, OG, OMF and NPK at all rates significantly increased (P<0.05) leaf area, biomass and yield of yam. Compared with control, all the treatments significantly increased soil and plant nutrients at different rates. Organomineral fertilizer significantly (P<0.05) increased the soil moisture content while PM and WA significantly decreased (<0.05) the bulk density. Organomineral fertilizer and organic manure increased yam production with better residual effects on soil chemical properties compared with mineral fertilizer.
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