Nutrient status of different soil samples of Dehradun district of Uttarakhand and their correlation with soil properties
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Date
2020-12
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
An experiment was conducted to analyze the general soil properties, status of available macronutrients (N, P and K) and to study the relationship between soil properties and macronutrients. Soil samples (0-15cm depth) were collected from 20 different location of Dehradun district Uttarakhand. Different methods of analysis of soil were employed to know the availability of N, P, and K. Available Nitrogen was analyzed by alkaline KMnO4 method, available phosphorus by Olsen’s method, AB-DTPA method, Mehlich-3 method and Morgan method, while available Potassium was analysed by Ammonium acetate, AB-DTPA, Mehlich-3 and Morgan methods. The soil texture ranged from medium texture to fine texture. Soil was found to be acidic to alkaline with pH ranging from 4.3-7.3 while, electrical conductivity was found to be medium ranging from 0.261dSm-1-0.602 dSm-1. The soils were found medium to high in organic carbon content and ranging from 0.60-1.8%. Extractable nitrogen by Alkaline KMnO4 method of study area ranged from 163- 301 kg N ha-1. Phosphorus extracted by Olsen’s, AB-DTPA, Mehlich-3 and Morgan methods ranged from 24.5-100.84 kg ha-1, 4.33-458.6 kg ha-1, 10.71-157.79 and 10.13- 107.69 kg ha-1, respectively. Available potassium extracted by ammonium acetate, ABDTPA, Mehlich-3 and Morgan methods ranged from 100.8-566.94 kg ha-1, 73.92-601.8 kg ha-1, 59.5-563.92 kg ha-1 and 22.0-441 kg ha-1, respectively. The soil pH showed negative and significant correlation with available nitrogen and potassium. The OC also showed significant but positive correlation with available N and EC for the entire area of study. On the basis of calculated nutrient indices, the soils under study were found to be low in extractable nitrogen and medium in extractable phosphorus and potassium.