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  • 2015-2019  (1)
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    Publication Date: 2016-12-01
    Description: Agricultural land degradation due to nutrient deficiencies is a threat to agricultural sustainability. As nutrients availability is influenced by soil heterogeneity, climatic conditions and anthropogenic activities, hence, delineation of nutrient management zones (MZs) based on spatial variability could be an effective management option at regional scale. Thus, the present study was carried out to delineate MZs in Shiwalik Himalayan region (SHR) of India by capturing spatial variability of soil properties and secondary and micronutrients status because of the emerging nutrient deficiencies. For the study, a total of 2575 geo-referenced representative surface (0-15 cm depth) soil samples were collected from the study region covering an area of 53483 km 2 . The soils were analyzed for pH, electrical conductivity (EC), soil organic carbon (SOC), available sulfur (S) and micronutrients (zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), boron (B) and molybdenum (Mo)) concentrations. There was wide variation in soil properties with coefficient of variation (CV) values of 14 (for pH) to 86% for available Mo. Geostatistical analysis revealed spherical, Gaussian, exponential, stable, circular and K-Bessel best-fit models for soil properties. Most of the soil properties were having moderate spatial dependency except soil pH and S (strong spatial dependency) and Zn (weak spatial dependency). About 49, 10, 2, 13, 11, 12 and 8% area of the study region were found to be deficient (including acute and marginal deficiency) in S, Zn, Fe, Cu, Mn, B and Mo, respectively. The principal component (PC) analysis and fuzzy-c- mean clustering was performed to develop the MZs. Four PCs with eigen values greater than 1 and accounting 65.4% of total variance were retained for further analysis. On the basis of fuzzy performance index (FPI) and normalized classification entropy (NCE), four potential MZs were identified. Analysis of variance confirmed the heterogeneity in most of the studied soil properties among the MZs. The study indicated that the methodology of delineating MZs can be effectively used in site-specific S and micronutrients management in SHR of India.
    Print ISSN: 1085-3278
    Electronic ISSN: 1099-145X
    Topics: Geography , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley-Blackwell
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