Nutrient status of soil as influenced by micronutrients fortified humic substance

Abstract

A Field experiment was conducted during Kharif 2017 at College of Agriculture, Vishweshwaraiah Canal Farm, Mandya. The experiment was laid out following RCBD with 10 treatments replicated thrice.The humic substance was extracted from FYM incubated with and without micronutrients and designated as enriched humic substance (EHS) and humic substance (HS), respectively. EHS and HS was tested at two levels i.e., 2.5 and 5 litres ha-1 using maize as test crop. The results revealed that no significant differences were observed on pH, electrical conductivity and organic carbon content of soil after the harvest of maize. But, T10 treatment (T2 + Enriched HS @ 5 L ha-1 30 DAS) recorded significantly higher available N, P2O5 K2O and micronutrients (Fe, Mn, Zn and Cu) content (279.19, 116.57, 187.80 kg ha-1, 9.30, 5.81, 1.20 and 0.94 mg kg-1, respectively) and also higher exchangeable Ca and Mg (7.87 and 3.87 (c mol (p+) kg-1, respectively). Significantly higher available sulphur (35.53 mg kg-1) content was recorded for T10 treatment over control. Whereas all the nutrients were observed to be lower for the treatment with RDF alone (T1).