The Status of Chemical Forms of Iron and Manganese in Various Orders of Calcareous Soils and Their Relationship with Some Physicochemical and Mineralogical Properties

The Pedospheric Variation of DTPA-Extractable Zn, Fe, Mn, Cu and Other Physicochemical Characteristics in Major Soil Orders in Existing Land Use Systems of Punjab, India

“…However, the positive correlation of Zn with OC (0.415), available P (0.355), followed by Fe with OC (0.237) and available K (0.401), while the correlation between Mn and Cu was observed to be positive with OC, available P and K in soils. A positive correlation of DTPA Zn, Cu, Fe and Mn with OC and available P and K has been reported in the literature [6]. Similar results were reported by some works [5,11,56].…”

“…The available forms of micronutrients are increased with an increase in the OC and clay content, which might be due to the adsorption on non-organic sites. However, in Aridisols, the accessibility of DTPA Zn, Cu, Fe and Mn were limited due to low OC content, high soil pH and coarse soil textures [6]. The micronutrient availability increased with the increase in OC, which might be due to improved soil structure, also acts as a chelating agent to increase the availability of micronutrients and prevent the oxidation of micronutrients.…”

“…The distribution of micronutrients is predominantly directed by the variation in topography, climatic conditions and soil development factors and processes that alter and soil pH, organic matter content in soils, complexation with natural organic chelates and redox reactions in soils, which affect nutrient availability in soils [5]. Similarly, the availability of soil micronutrients also depends on the topographical positions, soil development rates and the climatic conditions of the area under consideration [6].…”