Periodic release of micronutrients and other ions from different organic amendments
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Date
2018-05
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A laboratory incubation study was conducted both in quartz sand and soil at Department of Soil Science, G.B.P.U.A.&T., Pantnagar to study the periodic release pattern of micronutrients and other ions from different organic amendments. Treatments consisted of Farmyard manure (FYM), Mushroom compost, Poultry manure, Vermicompost, Biogas slurry and Biochar each applied @ 15 t/ha along with control, in a two factorial completely randomized design with two replications. The experiment was carried out at room temp for 120 days. The present investigation revealed that application of organic amendments in soil did not show any significant effect on pH over control after the incubation period except vermicompost, which slightly increased soil pH. Irrespective of the type, all organic amendments increased electrical conductivity due to release of nutrient ions during their mineralization. Organic C level of soil improved due to addition of organic amendments. More or less periodic release of all the micronutrients and other ions in quartz sand was initially low till one month but increased afterwards. The release pattern from organic amendments mainly depended on their initial reaction and also on the ease of their decomposition. The release of all ions except- Ca, Mg and Cu mainly depended on their total content in organic amendments. The per cent release of nutrients from different organic amendments applied to quartz sand revealed that biochar could be a good source of Zn, Fe and Mn while, the poultry manure would be a good source of Cu, B, Mg and S. For P and K, FYM might serve as a promising source. For soil application, poultry manure was proved as a good source of Zn, Cu, Mn, B, P and K nutrients while, mushroom compost released more Ca and Mg. The farmyard manure and vermicompost were a plentiful source of S and Fe, respectively but in case of Fe none of the amendments in soil registered higher release over control.
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