Formerly International Journal of Basic and Applied Agricultural Research

Status of some extractable macro- and micro-nutrients in soils of Tehri Garhwal district of Uttarakhand.

Pantnagar Journal of Research, Volume - 19, Issue - 2 ( May-August, 2021)

Published: 2021-09-01

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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 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. The ranges for general properties were: sandy loam to silty clay loam texture, 4.55 to 8.17 soil pH and 0.099-0.931 dSm-1 electrical conductivity (EC) (1:2 soil-water suspension) and 3.09-10.68 g kg-1 soil organic carbon content. The amount of alkaline KMnO4 extractable N in these soils ranged from 123.2-226.8 mg kg-1 soil while Olsen's or Bray's extractable P content ranged from 9.6-92.1 mg kg-1 soil. Neutral normal 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 per cent) extractable S ranged from 6.8 to 58.1 mg kg-1 soil. The contents of DTPA extractable Zn, Cu, Fe, and Mn were 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 soil pH had a significant and positive correlation with K, Ca, S, Zn, Cu, and B. Soil extractable P, K, S, Zn, Cu, and B had a significant and positive correlation with soil EC. Organic carbon in the soil had a significant and positive correlation with nitrogen and phosphorus. Overall for the whole district, the extent of macro-nutrient deficiencies was 4.0, 2.3 and 8.0 per cent for K, Ca and S, respectively while these values were 8.3, 12.0, 7.3 and 9.7 per cent for Zn, Fe, Mn and Mo, respectively

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