Browsing by Author "Amit Kumar Pradhan"

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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.
Cadmium sorption by vermicompost produced from recycled organic wastes
(Enviro Media, 2014) Amit Kumar Pradhan; Kasturikasen Beura; Ipsita Das; Nirmal De
Cadmium (Cd) is a highly toxic heavy metal and therefore represents a potential threat to the environment and human health. A study has been carried out to evaluate the sorption and kinetics of Cadmium in various types of vermicompost. The experiment was conducted on six different types of vermicompost at Institute of Agricultural Sciences of Banaras Hindu University. Six vermicompost bins/units were developed for decomposition of a few selected base materials like, temple wastes, vegetable crop residues, grass residues, dry mango leaf litter, regular farmyard manure and Cow dung. The study concludes that vermicompost is an effective adsorbent for the removal of Cd (II) metal ions from its aqueous solution. Vermicompost is able to adsorb nearly 80-99% of the cadmium in solution at variable concentrations. Vermicompost can thus be recommended for application to the soil for removal of Cadmium, and owing to its good nutrient composition it would prove helpful in improving the physical and chemical properties of the soil. Copyright © EM International.
Evaluation of extractability of different extractants for zinc and copper in soils under long-term fertilization
(Institute of Agricultural and Food Information, 2015) Amit Kumar Pradhan; K.S. Beura; R. Das; D. Padhan; G.C. Hazra; B. Mandal; N. De; V.N. Mishra; K.B. Polara; S. Sharma
We aimed to evaluate the extractability of different extractants for zinc (Zn) and copper (Cu) in soils of long-term field experiments covering different agro-ecological zones of India. The relationships between the amounts of Zn and Cu extracted by Mehlich 3, 0.1 mol/L HCl and AB-DTPA (ammonium bicarbonate-diethylenetriaminepentaacetic acid) with those extracted by DTPA, the conventional extraction method widely used in soil testing laboratories in India, were elucidated. The treatments of the long-term experiments included control (no fertilizer), 100% NPK, 50%NPK + 50% N through FYM (farm yard manure) and a fallow soil. Some important physico-chemical properties of soil like pH, organic carbon, textural class, CaCO 3 content, etc. were analyzed. The NPK + FYM treatment was found to be the most effective treatment in terms of increased content of Zn and Cu in soils. The results showed that the amount of Zn and Cu extracted by Mehlich 3 were significantly correlated with that extracted by 0.1 mol/L HCl (r = 0.970** for Zn and r = 0.914** for Cu). Accordingly, Mehlich 3 and 0.1 mol/L HCl could be used effectively for estimating Zn and Cu availability in soils of India. However, Mehlich 3 was superior to all the other extractants used for the study. © 2015, Institute of Agricultural and Food Information. All rights reserved.
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.