Status of some extractable macro- and micro-nutrients in soils of Chamoli district of Uttarakhand
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Date
2019-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A GPS based soil survey was conducted in the Chamoli district of Uttarakhand to analyze general soil properties, status of extractable macro-nutrients (P, K Ca, Mg, S), micro-nutrients (Zn, Cu, Fe, Mn, B, Mo) in the soils of that district and to study the relationship between general soil properties and soil extractable nutrients. A total of 300 surface soil (0-15 cm) samples were collected from the all nine blocks of Chamoli
district. In the soils of Chamoli district, soil texture ranged from sandy loam to clay loam, soil pH (1:2 soil water suspension) varied from 4.8 -8.29, electrical conductivity varied from 0.170 - 5.431 dSm-1 and Soil organic carbon content varied from 3.14 – 30.72 g kg-1 soil. Among the macro-nutrients, Olsen’s and Bray’s extractable P varied from 1.41 – 47.20 mg kg-1 soil, neutral normal ammonium acetate extractable K content varied from 24.82 – 269.11 mg kg-1 soil, Soil exchangeable Ca and Mg content varied from 20 – 1620 mg kg-1 and 12 – 288 mg kg-1 soil, respectively. The 0.15% CaCl2 extractable S content varied from 1.23 – 26.64 mg kg-1 soil. The DTPA extractable Zn, Cu, Fe, Mn content varied from 0.09 – 15.41 mg kg-1, 0.08 – 9.03 mg kg-1, 3.13 – 84.22 mg kg-1 and 1.93 – 54.96 mg kg-1 soil, respectively. Hot water soluble B content varied from 0.23 – 2.61 mg kg-1 soil and ammonium oxalate (pH 3.3) extractable Mo content varied from 0.18 – 1.36 mg kg-1 soil. The simple correlation studies show that soil pH had a significant and positive correlation with soil extractable P, Ca, S, B and Mo but a negative correlation with extractable Cu, Fe and Mn. Soil EC had a significant and positive correlation with extractable P, K, Mg, S, Fe, B and Mo. Soil organic carbon had a significant and positive correlation with extractable K. On the basis of calculated nutrient indices (N.I.), the soils of Chamoli district were acidic to slightly alkaline in reaction, low in soil extractable S, medium in extractable K and Zn, High in organic carbon content, extractable P, Ca, Mg, Cu, Fe, Mn, B and Mo with sporadic cases of Zn, Cu and B deficiency.