Browsing by Author "Ruma Das"

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Adsorption-desorption behaviour of arsenic on naturally occurring clay-organic complexes in an Alfisol and Inceptisol
(Springer, 2025) Deepak; Ruma Das; Debasis Golui; Nayan Ahmed; Ramswaroop Bana; Amrit Kumar Jha; Siba Prasad Datta
The adsorption-desorption characteristics of arsenic (As) in soil may affect its mobility, bioavailability, and potential toxicity. While As adsorption behaviour in soil has been thoroughly studied, very little is known about the interactions of As with clay-sized fractions present in soils, including clay-organic complexes (COC), clay-oxides, and clay. In this study, we investigated the adsorption and desorption behaviour of As on clay-sized fractions as a function of As concentration, pH, and temperature in two different soil orders, namely Alfisol and Inceptisol. Naturally occurring COC were isolated from bulk soil using density fractionation, while clay–oxides and clay fractions were obtained through selective chemical dissolution methods. Batch adsorption–desorption experiments of As were then conducted under controlled laboratory conditions. The adsorption data exhibited a strong fit to both the Langmuir (r = 0.95–0.99) and Freundlich (r = 0.97–0.99) isotherm models. The adsorption of As on the clay-sized fractions from both Alfisol and Inceptisol was exothermic (-∆H° = 13.7 to 34.3 kJ mol− 1) and spontaneous. Between the two soil orders, Alfisol had better As retention at the acidic pH (5.5) at 298 K. Among the clay-sized fractions, clay–oxides in Alfisol and COC in Inceptisol exhibited the highest As adsorption capacities (qmax) i.e., 588 and 344 µg g− 1, respectively. The Al-Fe oxides played a dominant role in As adsorption–desorption in Alfisol, whereas organic matter was more influential in Inceptisol. The desorption efficiency was higher in Inceptisol and the desorption index (DI) revealed comparatively higher hysteresis (DI > 1) for COC in Alfisol and Inceptisol and clay-oxides in Alfisol. These findings enhance understanding of the contrasting roles of Al–Fe oxides and organic matter to regulate As retention and desorption at varying temperature and pH, providing valuable insight for predicting As mobility and developing soil-specific management strategies to ensure environmental safety and sustainable agricultural production. © The Author(s) under exclusive licence to Society for Environmental Sustainability 2025.
Boron availability in soils and its nutrition of crops under long-term fertility experiments in India
(Elsevier B.V., 2019) Ruma Das; Biswapati Mandal; Dibyendu Sarkar; Amit Kumar Pradhan; Ashim Datta; Dhaneshwar Padhan; Anindita Seth; Rahul Kumar; Nirmal De; V.N. Mishra; K.B. Polara; Sanjay Sharma; N.P. Thakur; Dileep Kachroo; M. Ray; Anil Sharma; K.P. Patel; Lalit Mohan Garnayak; W.N. Narkhede
Using 12 long-term (of 15 to 42 years duration)experiments with different cropping systems under various soils and agro-climatic conditions, we studied how different (inorganic and integrated)nutrient management practices influenced boron (B)availability in soils, and its nutrition of nine crops. To this end, four nutrient management practices viz., NPK (recommended dose of N, P and K), NPK + FYM (farmyard manure), control and fallow, which were common in all the experiments, were selected and their effects on B availability in soils were tested using four commonly used methods viz., hot-CaCl2 (HCC), KH2PO4 (PDP), mannitol-CaCl2 (MCC)and hydrochloric acid (HCl)in relation to B nutrition of wheat, rice, cowpea, sorghum, sesame, mustard, groundnut, soybean and lentil. Amounts of B extracted by the four different methods followed the order HCC = HCl > MCC > PDP across the tested soils. Averaged over the extractants, long-term nutrient management practices with NPK + FYM resulted in 15% increases in available B in soil over the control, which produced 20% increase in plant tissue B concentration. Such increases with integrated (NPK + FYM)nutrient management practices maintained available B in soils and plant tissues above its critical limits that supplied adequate amounts of B for nutrition of all the tested crops grown intensively for so many years. A B balance study in six experimental sites showed a net B accumulation over time as irrigation water contained and supplied (130–296 g B ha−1 year−1)more B than removed by harvested crops. Of the four methods used, HCC was the best for assessment of availability of B in soils under long-term cultivation. © 2019 Elsevier B.V.
Correction: Adsorption-desorption behaviour of arsenic on naturally occurring clay-organic complexes in an Alfisol and Inceptisol (Environmental Sustainability, (2025), 8, 4, (715-729), 10.1007/s42398-025-00384-6)
(Springer, 2025) Deepak; Ruma Das; Debasis Golui; Nayan Ahmed; Ramswaroop Bana; Amrit Kumar Jha; Siba Prasad Datta
In this article year of publication for Reference “Wang S, Mulligan, CN (2006). Effect of natural organic matter on arsenic release from soils and sediments into groundwater. Environ Geochem Health 28 (3): 197–214.” was incorrectly given as 2009. Consequently, the citation “Wang and Mulligan 2009” has also been corrected to “Wang and Mulligan 2006” in section “Effect of organic matter and Al-Fe oxides on As adsorption by clay-sized fractions”. The original article has been corrected. © The Author(s) under exclusive licence to Society for Environmental Sustainability 2025.
Zinc in the soil–plant continuum: A long-term perspective from selected Inceptisols in India
(John Wiley and Sons Inc, 2025) Amit Kumar Pradhan; K. S. Beura; Ruma Das; Sagar Nandulal Ingle; Biswapati B. Mandal; Gorachand Hazra; Nirmal De; K. B. Polara; Dileep Kachroo; Anil Sharma; Kishorbhai Purshottambhai Patel
Long-term experiments are valuable resources for studying the nutrient dynamics and overall assessment of the impacts of fertilization and provide a unique opportunity to evaluate the influence of different management practices and agro-climatic conditions over a number of years. The present study was carried out in seven different long-term experiments to investigate the impact of integrated nutrient management on yield, Zn uptake by crops under various cropping systems and Zn distribution in the soil. The Zn balance in the soil after several years of cultivation was also estimated. Irrespective of experimental sites, 4 common treatments viz., Control (T1), 100% NPK (T2), 50% NPK + 50%N through FYM (T3) and an uncultivated fallow (T4) were selected for the comparative study. N, P and K were supplied through inorganic fertilizers and farmyard manure was integrated with fertilizers for T3. The treatment with conjunctive application of chemical fertilizers and organic matter (FYM) was observed to maintain a positive Zn balance (25.05 to 183.65 g ha−1 across sites) in soil after years of cultivation and evidently promoted Zn uptake which was 39.41% higher than the 100% NPK treatment across sites and crops. These findings elucidate the need to optimize different nutrient management practices under different climatic scenarios in the soil–plant system for higher yield and uptake of crucial nutrients like Zn, which is a need for sustainable agriculture and human health. © 2025 British Society of Soil Science.