Distribution of Forms of Copper and their Association with Soil Properties and Uptake in Major Soil Orders in Semi-arid Soils of Punjab, India

Abstract

all soils were considered, total Cu content ranged from 7 to 37 mg kg −1 , while DTPA-extractable and soil solution plus exchangeable Cu contents ranged from 0.30 to 3.26 mg kg −1 and from 0.02 to 0.43 mg kg −1 , respectively. Copper adsorbed onto inorganic sites ranged from 0.62 to 2.6 mg kg −1 and that onto oxide surfaces ranged from 2.0 to 13.2 mg kg −1 . The Cu bound by organic sites ranged from 1.2 to 12.2 mg kg −1 . The magnitudes of different forms of Cu in soils did not exhibit any consistent pattern of distribution. Organic matter and size fractions (clay and silt) had a strong influence on the distribution of different forms of Cu. The content of all forms of Cu was generally greater in the fine-textured Alfisols and Inceptisols than coarse-textured Entisols. Soil solution plus exchangeable Cu, Cu held onto organic sites, and and Cu adsorbed onto inorganic sites (crystalline) had significant positive correlations with organic carbon and silt contents.The DTPA Cu was positively correlated with organic carbon, silt, and clay contents. Total Cu content strongly correlated with silt and clay contents of soils. Among the forms, Cu held on the organic site, water soluble + exchangeable Cu, and Cu adsorbed onto oxide surface were positively correlated with DTPA-extractable Cu. The DTPA-extractable Cu and soil solution plus exchangeable Cu seems to be good indices of Cu availability in soils and can be used for correction of Cu deficiency in the soils of the region. The uptake of Cu was greater in fine-textured Inceptisols and Alfisols than coarse-textured Entisols. Among the different forms only DTPA-extractable Cu was positively correlated with total uptake of Cu.

Metal Nutrient Distribution and Availability in Vegetable Growing Soils of Coimbatore District, Tamil Nadu

“…The positive correlation were observed with organic carbon and clay content. The results of Sharma et al, [26] and Meena et al, [27] showed identical results with the results of the current study. The high negative influence of pH towards available copper might be due to be adsorption, fixation and precipitation.…”

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

“…The higher content of Cu in Entisol and Inceptisol is ascribed to variation in exogenic carbon inputs that stimulated the biomass and activity of microbes, thereby increasing the decomposition rate and release of micronutrients in soils [47,56,60]. The higher content of Cu in Inceptisols might be associated with an increase in clay content, resulting in its adsorption or fixation [1]. Similar results showing the higher content of DTPA-Cu in Inceptisols were reported by some workers [1].…”

“…The greater EC under Aridisol may be due to its higher evaporation, leading to the deposition of soluble salts [32]. The higher EC under Aridisols might primarily be also due to greater accumulation of salts in soils [1].…”

“…The variability in texture under soil orders showed that it was finest in Inceptisol, followed by Entisol and the least in Aridisol. The greater clay content was observed in Entisol and Inceptisol soil orders, and that might be due to the higher stratified nature of these soils [1]. Soils under Entisol possess a finer texture, i.e., higher clay around 19 per cent that corresponds to more organic matter addition and higher microbial activity, thereby improving soil fertility and more productivity as compared to undisturbed land-use systems [26].…”

“…Micronutrient deficiencies in crops are gaining attention, owing to the adoption of high-yielding varieties, exhaustive cropping, improved crop yield, enhanced usage of high analysis fertilizers and lesser utilization of crop residues, animal manures and composts [1]. The deficiency of micronutrients employed a significant setback on the performance of crops in terms of food grain production, therefore showing an impact on the food chain [2].…”