Status of some extractable macro and micro-nutrients in soils of Tehri Garhwal district of Uttarakhand
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Date
2020-09
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
An investigation was carried out to analyze the general soil properties and extractable macro- (N, P, K, Ca, Mg, S) and micro-nutrients (Zn, Cu, Fe, Mn, B, Mo) in the soils of Tehri Garhwal district and to study the relationships between general soil properties and soil extractable nutrients. Surface (0-15 cm) soil samples (n= 300) were taken from the nine developmental blocks of Tehri Garhwal. In the soils of Tehri Garhwal district, the soil texture was ranging from sandy loam to silty clay loam, soil pH (1:2 soil- water suspension) varied from 4.55-8.17, electrical conductivity (EC) ranged from 0.099-0.931 dSm-1 and soil organic carbon content varied from 3.09-10.68 g kg-1 soil. Alkaline KMnO4 extractable N varied from 123.2-226.8 mg kg-1soil, Olsen’s and Bray’s extractable P content ranged from 9.6-92.1 mg kg-1 soil. 1 N Neutral ammonium acetate extractable K, Ca and Mg varied from 44.5-296.7 mg kg-1 soil, 50 - 3550 mg kg-1 soil and 30 - 1560 mg kg-1 soil, respectively. Calcium chloride (0.15%) extractable S varied from 6.8-58.1 mg kg-1 soil. The DTPA extractable Zn, Cu, Fe, Mn varied from 0.20-16.30 mg kg-1 soil, 0.25-11.03 mg kg-1 soil, 0.39-78.0 mg kg-1 soil and 0.29-61.37 mg kg-1 soil, respectively. Hot water soluble B ranged from 0.30-3.60 mg kg-1 soil and ammonium oxalate (pH 3.3) extractable Mo varied from 0.07-0.52 mg kg-1 soil. The correlation study between soil properties and nutrient content revealed that soil pH had a significant and positive correlation with K, Ca, S, Zn, Cu and B. Soil EC had shown a significant and positive correlation with P, K, S, Zn, Cu and B. Soil organic carbon had a significant and positive correlation with N and P. According to the calculated nutrient indices (N.I.), the soils of Tehri Garhwal district were medium in extractable N, but high in rest of the nutrients (P, K, Ca, Mg, S, Zn, Cu, Fe, Mn, B and Mo).