Author(s):

Sanjay-Swami and Chingak PW Konyak

Abstract: To investigate the influence of integrated nutrient management on soil dehydrogenase enzyme activity and microbial biomass carbon in acid Inceptisol, a field experiment was conducted at School of Natural Resource Management, College of Post Graduate Studies in Agricultural Sciences, Umiam, Meghalaya during rabi 2017-18. Cabbage (Brassica oleracea L. var. capitata) cv. Wonder Ball was raised as test crop with eight different combinations of doses of Farm Yard Manure (FYM), Vermicompost (VC) and recommended doses of NPK fertilizers (RDF). The treatment combination consists of control (T₁), 100% RDF (T₂), 100% N through FYM (T₃), 100% N through VC (T₄), 50% RDF + 50% N through FYM (T₅), 75% RDF + 25% N through FYM (T₆), 50% RDF + 50% N through VC (T₇) and 75% RDF + 25% N through VC (T₈). The experiment was laid out in RBD and replicated thrice. The experimental soil was having pH 4.87, SOC 1.24%, Alkaline KMnO₄- N 160 kg/ha, available P₂O₅ 18.60 kg/ha and available K₂O 238.4 kg/ha. The experimental results revealed that treatment T₇ with 50% RDF + 50% N through VC produced highest cabbage yield (60.44 t/ha) which was statistically comparable with T₅ of 50% RDF + 50% N through FYM (54.33 t/ha). Significantly higher soil dehydrogenase enzyme activity (DHA) and soil microbial biomass carbon (SMBC) was observed under all organic manures treatments over the control and sole inorganic treatments. Among the organic treatments, T₃ (100% N through FYM) recorded highest DHA and SMBC. In both combined treatments, farm yard manure treated soils (T₅ and T₆) showed higher DHA and SMBC over vermicompost treated soils (T₇ and T₈) indicating superiority of FYM over VC in maintaining soil biological health after harvest of cabbage.

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