Nutrient Release Pattern from Leptic Cambisols as Influenced by Vermicompost and Inorganic Fertilizer Applications
Keywords:
Nutrient availability, growth stages, mineralization, nutrient declineAbstract
An experiment was conducted to determine the effects of vermicompost, inorganic fertilizers and their combinations on release of soil nutrients, at different growth stages of wheat. A factorial combination of four levels of inorganic fertilizers (33.33 %, 66.66%, and 100 % of the recommended NPK fertilizers) and vermicompost (0, 2, 4 and 6 t ha-1) 0, were laid out in Complete Randomized Design (CRD) with three replications. Soil was collected before planting and after planting (at tillering, flowering and maturity stages of wheat) from each pot in order to determine dynamics of selected nutrients [Nitrogen (N), Phosphorus (P) and Potassium (K)]. The interaction between vermicompost and chemical fertilizers were not significant for NPK contents of the soil at all growth stages except phosphorus at heading stage. In all cases, highly significant increases in total N, available P and K in the soil were observed due to the increasing rates of main effect vermicompost or inorganic fertilizers during all growing periods. The highest available as well as total contents of NPK in the soil were found at tillering stage. This initial increment at tillering stage for both factors showed a declining trend later at heading and maturity stages. However, the observed decline was in exception for vermicompost applied at 6 t ha-1, which maintained highest level of available P and K and 4 t ha-1 which continued mineralization of K up to heading stage. In general, application of 6 tone vermicompost per hectare was found proportional with the full dose of the recommended fertilizers in supplying NPK for wheat crop. Therefore, building up the total as well as available NPK to higher levels up to heading stage can bring maximum nutrient uptake and yields of wheat.
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