Long term effect of integrated nutrient management on soil organic carbon and physico-chemical properties of soil in Maize-Mustard crop rotation under rainfed agriculture
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Date
2022-01
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The present investigation entitled “Long term effect of integrated nutrient management on soil organic carbon and physico-chemical properties of soil in Maize-Mustard crop rotation under rainfed agriculture” was carried out at Dry Land Research Sub-station RakhDhiansar, (SKUAST-J) Jammu. The experiment was laid out in randomized block design with ten treatments replicated thrice. The treatments comprised of Control, 100% RDF of N,P,K through chemicals, 50% RDF of N,P,K through chemicals, 50% RD of N through crop residue, 50% RD of N through FYM, 50% RDF of N,P,K through chemicals + 50% RDF of N through crop residues, 50% RDF of N,P,K through chemicals + 50% RD of N through FYM, FYM @ 10 ton/ha, 100% RDF of N,P,K through chemicals + Zinc Sulphate @ 20kg/ha and Farmer practice (FYM @ 4 ton/ha + 40kg urea /ha).
Application of organic manures(FYM/crop residues) only or in combination with inorganic fertilizers improved the physical properties like bulk density, porosity, aggregate stability and infiltration rate over control. In the sub-surface soil, the physical properties also showed positive response to INM treatments. However, in the sub-surface soil, there was less improvement in physico-chemical properties as compared to the surface layer of the soil. The availability of macro(N,P,K) and micro(Fe, Zn, Cu, Mn) nutrients increased with the substitution of 50% RDF of NPK through chemicals along with 50% N through organic amendments. The maximum increase in available zinc found with the application of zinc sulphate @20kg/ha along with 100% NPK in the soil. Organic carbon, MBC and permanganate oxidizable carbon showed higher values with the conjoint application of both organic and inorganic fertilizers and also with use of FYM alone @10ton/ha. The INM practices proved very beneficial for the growth and production of both maize and mustard crops. INM treatments by increase the nutrient supply and promoting better root growth resulted in higher yield of both maize and mustard crops in rainfed areas.
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