Vertical distribution of DTPAextractable micronutrients and its correlation with soil properties in selected soil profiles of Birbhum District of West Bengal

Abstract

The present study was undertaken to assess the vertical distribution of DTPA-extractable micronutrients viz. zinc, copper, iron and manganese in relation to soil properties in five selected soil profiles, one each from Sainthia, Suri II, Rampurhat II, Md Bazar and Nalhati I block of Birbhum district of West Bengal. Collected soil samples were analysed for pH, electrical conductivity, organic carbon, textural class (% sand, silt, clay) and DTPA-extractable micronutrients using standard analytical methods. The soil texture varied from silt loam to silt. Based on the fertility ratings, pH of the profile soils was strongly acidic to neutral, showing increasing trend with depth. Its value ranged from 5.012-7.121. Electrical conductivity was found in normal range. Low to medium organic carbon content was found and its distribution was found decreasing with increasing depth. Iron, manganese and copper were estimated to occur above critical level, whereas low to medium available zinc was found. The available zinc, iron, manganese and copper contents in soils ranged from 0.264-1.618 mg/kg, 5.158-51.820 mg/kg, 1.788-20.720 mg/ kg and 0.324-3.364 mg/kg respectively. In general, all the micronutrients show decreasing trend with increase in depth. The pH of the collected soil samples showed significant and negative correlation with available iron (r=-0.603*) and manganese (r=-0.524*) whereas pH correlated nonsignificantly and negatively with available zinc (r=-0.343) and copper (r=-0.484). Soil organic carbon showed significant and positive correlation with all the micronutrients. Non-significant and negative correlation was found between electrical conductivity and available micronutrients except available iron which showed significant and negative correlation with electrical conductivity (r=-0.560*).

Evaluation of Extractants for Determination of Micronutrients in Soils of South Gujarat, India

“…However, at higher CaCO3 content manganese is precipitates into MnCO3 that will reduce the Mn availability for the plants. The similar results were also reported earlier by Tisdale et al [17], Meena et al [18], Meena and Mathur [19] and Mandal et al [20].…”

Availability of Cationic Micronutrients in Soils of Bankura District of West Bengal, India

“…The presence of Mn-bearing parent materials might also be responsible for this. Comparable outcomes were also documented by Singh et al [13], Mandavgade et al [19] and Sunandana et al [17]. According to Jain et al [20], the concentration of DTPA extractable micronutrients (iron, manganese, copper, and zinc) was highest in forest soil and at a depth of 0-15 cm and dropped as soil depth increased.…”

“…The production of insoluble Mn-oxides at higher pH values may be the cause of the negative association between accessible manganese and soil pH. The outcomes of Patel et al [24], Sunandana et al [17], and Manasa et al [25] are in good accord with these findings. There was a strong and positive connection between the DTPAextractable manganese and iron (0.29**).…”

“…The soils of Chatna Block had the lowest mean value of Fe concentration (21.51 mg kg -1 ), whereas the soils of Sarenga Block had the greatest mean value of Fe content (41.12 mg kg -1 ). High available Fe status is perhaps because of the accumulation of OC which has its affinity to influence the solubility and availability of Fe through the chelation effect as reported by Sunandana et al [17]. According to Hrangbung et al [18], another explanation could be the washing out of basic cations from the surface soils.…”

Response of Rice (Oryza sativa L.) to Soil and Foliar Application of Nano-ZnO and Bulk Zn-fertilizer in Red Acidic Soil of West Bengal, India

“…Lakshmi et al (2021) reported that the major concern in human diets is the adequacy in grain Zn in staple food crops like rice and wheat. Zn deficiency appears as a major threat for the human population whose staple food is rice (Stein, 2010;Mandal & Ghosh, 2020). The sustainable strategy to solve the problem of Zn deficiency in humans is to enhance grain Zn concentration in staple food crops (Haider et al, 2021;Khampuang et al, 2021).…”