Effect of Industrial Manufactured Organic and Organomineral Fertilizers on Soil pH, Major Nutrients and Their Interactions at 90 Days of Incubation
Okubena Dipeolu Esther Adeyinka
Department of Agriculture, School of Agriculture, Lagos State University, Epe, Lagos, Nigeria
Ayeni Leye Samuel *
Department of Agricultural Science, Adeyemi College of Education, Ondo, Ondo State, Nigeria
K. J. Oyebamiji
Department of Crop Science, Joseph Ayo Babalola University, Ikeji Arakeji, Osun State, Nigeria
*Author to whom correspondence should be addressed.
Abstract
Objective: Incubation study was carried out to determine the effect of organic fertilizer (OG) and organomineral fertilizer (OMF) on soil major nutrients in Ondo, South Western Nigeria.
Design: Organic and organomineral fertilizers were separately applied to 100 g soil at the rate of 0.25 and 0.5 g. The treatments were arranged on completely randomized design with six replications in the laboratory and incubated for 90 days.
Analysis: Data collected were subjected to analysis of variance and the means were separated with the use of Duncan Multiple Range Test (DMRT).
Results: Compared with control, OG applied at 0.25 and 0.5 g/100 g soil increased soil pH by 5 and 8% respectively. Organic fertilizer (OG) and organomineral fertilizer (OMF) at all rates significantly increased OC, between 12 and 23%, total N between 39 and 108%, available P (35-84%) and exchangeable K (5-17%). Application of 0.25 g OG, 0.5 g OG and 0.25 g OMF increased exchangeable Ca by 6, 30, and 0.02% respectively while Mg was increased by 52, 17 and 9.1% respectively. Application of 0.25 g and 0.5 g OMF increased exchange acidity by 17 and 33% respectively. Application of OG and OMF increased soil major nutrients beyond the critical level recommended for optimum crop production in south-western Nigeria.
Keywords: pH, nitrogen, phosphorus, potassium and calcium