Browsing by Author "Kapil A. Chobhe"

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Impact of long term integrated nutrient management (INM) practice on aluminium dynamics and nutritional quality of rice under acidic Inceptisol
(Taylor and Francis Ltd., 2022) Abhik Patra; V.K. Sharma; D.J. Nath; T.J. Purakayastha; Mandira Barman; Sarvendra Kumar; Kapil A. Chobhe; Asik Dutta; Ajin S Anil
Applications of enriched compost (ECM) with reduced doses of inorganic fertilizers over ten consecutive years reduced phytotoxic aluminium (Al) fractions, whereas, improved nutritional quality of rice in acid soil. The long-term field trial with integrated nutrient management (INM) practices was initiated in kharif–2006 at Instructional-cum-Research (ICR) farm under rice mono-cropping system. Treatments consisted of T1; absolute control, T2; 100% recommended doses of nitrogen (N), phosphorus (P) and potassium (K), T3; 50% recommended doses of NP + 100% K + biofertilizer, T4; 50% recommended doses of NP + 100% K + ECM at 1 tonne ha−1 and T5; 25% recommended doses of NP + 100% K + ECM at 2 tonne ha−1. Exchangeable Al (~31%) and strongly organically bound and interlayer Al (~26%) fractions decreased with an increasing dose of ECM application at all soil depths. However, weakly organically bound Al (~25%), amorphous Al (~7.3%), and free Al (~13%) significantly increased over 100% NPK. Long-term use of ECM had a significant positive impact on micronutrient content in post-harvest soil. Micronutrient accumulation (Zn, Fe, Cu, Mn and Ni) in rice increased with continuous application of manuring and fertilization, while the accumulation of Al decreased significantly. © 2022 Informa UK Limited, trading as Taylor & Francis Group.
Impact of Long-Term Conservation Agriculture Practices on Phosphorus Dynamics under Maize-Based Cropping Systems in a Sub-Tropical Soil
(MDPI, 2022) Ajin S. Anil; Vinod K. Sharma; Raimundo Jiménez-Ballesta; Chittar M. Parihar; Siba P. Datta; Mandira Barman; Kapil A. Chobhe; Chiranjeev Kumawat; Abhik Patra; Surendra Singh Jatav
Over the past decade, scientific studies have increasingly concentrated on the effects of global phosphorus (P) scarcity on food security. A comprehensive strategy that considers demand reduction and recycling possibilities is needed to address the global P scarcity. Reduced tillage along with crop residue retention could decrease fixation of P in soil, improve labile P content and enhance organic-P (Po) buildup and its mineralization by phosphatases; this could be an extra benefit of conservation agriculture (CA) in soils. To study the impact of long-term CA on soil organic and inorganic P fractions and their distribution, a long-term field trial was conducted under a maize-based cropping system with different tillage (zero tillage (ZT), permanent bed (PB) and conventional till (CT) and cropping system (maize–wheat–mungbean (MWMb), maize–chickpea–sesbania (MCS), maize–mustard–mungbean (MMuMb) and maize–maize–sesbania (MMS)). Phosphorus dynamics were studied through sequential fractionation (organic and inorganic P) at 0–5 and 5–15 cm soil depth. The findings showed that a higher amount of soluble and loosely bound P (SL-P) was detected in ZT among the inorganic P fractions, whereas iron-bound P (Fe-P), aluminum-bound P (Al-P), reductant soluble P (RES-P) and calcium-bound P (Ca-P) were found higher in CT in both soil depths. Among Organic-P fractions, moderately labile and non-labile Po was found higher in PB and ZT but, in the case of labile Po, it was found insignificant with respect to tillage operations. Significant synergistic effects of winter legume (chickpea) with summer legumes (sesbania and mungbean) in crop rotation were observed on SL-P, Labile Po, Humic acid-Po, Alkaline phosphatase and MBP at 0–5 and 5–15 cm soil depths. Given the potential relevance of understanding P dynamics for efficient P management in long-term conservation agriculture practices, our findings offers critical new insight for the P management for sustainable development. © 2022 by the authors.
Long-term effect of integrated nutrient management on yield and nutrients uptake by rice (Oryza sativa) in acid soil
(Indian Council of Agricultural Research, 2018) Abhik Patra; V.K. Sharma; T.J. Purakayastha; Mandira Barman; Sarvendra Kumar; D. Chakraborty; Kapil A. Chobhe; D.J. Nath
Long-term field experiment on rice commenced in kharif 2006 at Instructional-cum-Research farm of the Assam Agricultural University, Jorhat with integrated nutrient management practices for assessing its impact on yield and nutrient uptake by rice in acid soil. The treatments consisted of T1, absolute control; T2,100% recommended doses (RD) of inorganic NPK; T3, 50% RD of inorganic NP + 100% K + biofertilizers; T4, 50% RD of inorganic NP + 100% K + enriched compost @ 1 tonne/ha; and T5, 25% RD of inorganic NP + 100% K + enriched compost @ 2 tonnes/ha. Results revealed that after 10 years of experiment, grain yield of rice (4.43 t/ha) increased significantly with 100% NPK by 10.8 and 78.6 % over 50% NP+100% K+ bio-fertilizers and control, respectively and it was at par with 25% NP + 100% K+ enriched compost @ 2 t/ha (4.38 t/ha). Whereas, the maximum straw yield (5.18 t/ha) was recorded with 25% NP + 100% K+ enriched compost @ 2 t/ha which was higher significantly over 50% NP and 100% K+ bio-fertilizers (4.63 t/ha) and control (3.08 t/ha), respectively and total nutrient uptake, i.e. N, P, K, Zn, Cu and Ni by rice was significantly higher in 25% RD of inorganic NP + 100% K + enriched compost @ 2 tonnes/ha treatment as compared to recommended dose of fertilizer (100% NPK) in acid soil but total aluminium uptake by rice significantly decreased with the application of reduced doses of NP along with higher dose of enriched compost (2 t/ha). Therefore, aluminium toxicity level in rice plant under acidic condition could be reduced through enriched compost application. © 2018 Indian Council of Agricultural Research. All rights reserved.