Browsing by Author "K.B. Polara"

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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.
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.
Extractable iron and manganese in soil as influenced by management practices in some long-term experiments of India
(IndianJournals.com, 2018) A.K. Pradhan; K.S. Beura; R. Das; D. Padhan; G.C. Hazra; B. Mandal; N. De; V.N. Mishra; S. Sharma; K.B. Polara
[No abstract available]