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Dive into the research topics where Ajit Kumar Dolui is active.

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Featured researches published by Ajit Kumar Dolui.


Archives of Agronomy and Soil Science | 2012

Evaluation of a new composting method in terms of its biodegradation pathway and assessment of compost quality, maturity and stability

A Seal; R Bera; Ashis Kumar Chatterjee; Ajit Kumar Dolui

The need for scientific composting methods for effective utilization of organic waste is increasing day by day. In this respect, a new process called the Novcom composting method is being increasingly adopted by the organic tea planters of Assam and Darjeeling (India) for large-scale composting. Study of the biodegradation process under this method and quality evaluation of the end product was carried out at Maud tea estate (Assam) during 2008–2009 and 2009–2010. Generation of high temperatures (>65°C) within the compost heap during the biodegradation process provided an indication regarding the destruction of pathogens and weed seeds in the composted material. Samples collected on day 0, 7, 14, 21 and 30 of composting, were analyzed for physicochemical properties, nutrient status, microbial population, stability and phytotoxicity parameters. The most significant finding was the high microbial population (in the order of 1016 cfu g−1) in the final product, which was generated naturally during biodegradation. Assessment of the maturity and stability parameters of the compost indicated that biodegradation was complete in ∼3 weeks. The study provided an indication of the potential of the Novcom composting method for the production of good quality, stable and mature compost, within a short period.


Communications in Soil Science and Plant Analysis | 2007

Sulphur Mineralization and Carbon, Nitrogen, and Sulphur Relationships in Some Alfisols of India

Ajit Kumar Dolui; S. Pradhan

Abstract The amount of sulphur (S), nitrogen (N), and organic carbon (C) in different layers of soils from some Alfisols varied considerably with location. The amount of S extracted by different extractants as a percentage of the total S was in the order of organic (3.5%)>0.05 (N) NH4OAc+0.25 (N) HOAc (1.9%)>0.1 (N) H3PO4 (1.8%)>0.025 (N) CaCl2 (1.8%)>0.03 (N) NaH2PO4 (1.7%)>0.001 (N) HCl (0.6%). In all the soil series SO4 2−‐S mineralization decreased up to the second week after incubation, followed by a slight increase up to the fourth week, a subsequent decline up to the sixth week, and a slight increase up to the eighth week. The C:N, C:S, N:S, and C:N:S ratios averaged 9.4:1, 63.7:1, 6.9:1, and 94:10:2.08, respectively.


Communications in Soil Science and Plant Analysis | 2007

Influence of Different Forms of Iron and Aluminum on the Nature of Soil Acidity of Some Inceptisols, Alfisols, and Ultisols

Ajit Kumar Dolui; A. Mondal

Abstract Fifteen acid soils of Mizoram representing Ultisols and Inceptisols, and Madhya Pradesh, representing Alfisols, were studied to characterize the nature of acidity in relation to different forms of iron (Fe) and aluminum (Al). The mean contents of Fe and Al were extracted by various extracting reagents and were found to be in descending order as followed: dithionite>oxalate>pyrophosphate>ammonium acetate>KCl. The electrostatically bonded EB‐H+ and EB‐Al3+ acidity comprised 28.3 and 71.7% of exchangeable acidity whereas EB‐H+, EB‐Al3+, exchangeable, and pH‐dependent acidities comprised 9.8, 30.7, 40.5, and 59.5% of total potential acidity. All forms, of acidity showed significant correlation with pHk and organic carbon. Among the different forms, Fe and Al caused most of the variations in different forms of soil acidity but the effect of different forms of Al are more active and directly participate in the formation of EB‐H+, EB‐Al3+, and exchangeable acidity.


Archives of Agronomy and Soil Science | 2017

Self-generated microbial population or cultured microflora – an important criterion toward development of an effective and economically viable road map for organic soil management

Ranjan Bera; Antara Seal; Anupam Datta; Susmita Saha; Ajit Kumar Dolui; Ranjit K. Sarkar; Ashis Kumar Chatterjee; Arun Kumar Barik; Gopal Chandra De; Debashis Mazumdar

ABSTRACT Huge depletion of soil microflora under conventional farming practice has become the primary contributory factor toward the present depletion of soil and crop productivity. Reconstitution of soil microbial dynamics has been identified as the only way out, but there has been a debate regarding the most effective pathway for soil rejuvenation i.e. whether to create the environment for natural proliferation or opt for inoculation of laboratory generated microbes. In this respect, a study was undertaken at Maud T.E. (Assam) under FAO-CFC-TBI Project, where bio-fertilizer (microbial inoculant, MI), vermicompost (organic food source, OF), vermicompost + bio-fertilizer (OF+MI), and Novcom compost (representing self-generated native microflora in the order of 1016c.f.u. along with organic food source, SNM); were taken as treatments for a yield target of 1500 kg made tea/ha. The highest crop yield (1500 kg ha−1) along with high and consistent soil quality development was noted under SNM treatment; while MI influenced lowest yield (1268 kg ha−1) and minimal soil response. Addition of the organic food source with cultured microbes (MI+OF) was found to improve crop performance (1427 kg ha−1), but with 7.60 times higher cost (Rs. 39.97 kg−1 made tea). Economic viability study indicated that except SNM, all other treatments were vulnerable toward crop loss or market downfall.


Communications in Soil Science and Plant Analysis | 2016

Effect of Integrated Nutrient Management on Soil Fertility and Yield of Rice (Oryza sativa L.) under the System of Rice Intensification in the Indian Subtropics

Satyajit Sarkar; Dilip Kumar Das; Ajit Kumar Dolui

ABSTRACT Field experiments were conducted at Water Management Research Station, Begopara, Nadia, WB, India, during the rabi seasons of 2008–2009 and 2009–2010 to find out the integrated effect of nitrogen (N), phosphorus (P), potassium (K), farmyard manure (FYM) and zinc (Zn) under the system of rice intensification (SRI) techniques using eight treatments on the fertility changes in soil. The results revealed that the amounts of organic carbon and available N content in soil were found to maintain the highest fertility status with the highest yield in T6 (NPK + FYM 10 tha−1 + Zn 5 kgha−1) and gave the highest N uptake (55.98 kgha−1). The availability of P decreased with the increased level of Zn application and gave the highest P uptake (23.52 kgha−1) in the treatment T5 (NPK + FYM 10 tha−1). The highest Zn content (4.71 mgkg−1) was recorded in the treatment T7 (NPK + FYM 10 tha−1+ Zn 10 kgha−1).


Archives of Agronomy and Soil Science | 2007

Characterization of soils developed under tropical environment for land use planning in fringe of Chhotanagpur Plateau in eastern India

Ranjan Bera; Antara Seal; Pradip Bhattacharyya; Kaushik Mukherjee; Ajit Kumar Dolui; Kangjoo Kim; Seok Hwi Kim

Abstract Soils developed on various physiography at the foothills of Chhotanagpur Plateau were studied to characterize, classify and evaluate their suitability for existing crops. The soils in general were moderately deep (78 cm) to deep (120 cm), well drained to poorly drained, greyish in colour (hue 7.5 YR to 2.5Y) with redoximorphic features, loam to clay loam in surface texture, slightly acidic to neutral (pH 5.3 – 6.7) in reaction with low content of organic carbon. These soils are classified as Udic Haplustalfs, Udic Paleustalfs and Typic Endoaqualfs. The major limitations of these soils were slight to moderate erosion and low soil fertility in terms of organic carbon. Soil-site suitability evaluation revealed that in general, existing crops, such as rice (Oryza sativa), wheat (Triticum aestivum L.), pea (Pisum sativum L.), mustard (Brassica juncea L.), sesame (Sesamum indicum L.) and groundnut (Arachis hypogea L.) were only moderately to marginally suitable. Maize (Zea mays L.), Bengal gram (Cicer arietinum L.) and lentil (Lens culinaris) were suggested as alternate crops where as plantation of fruit trees (Mangifera indica, Psidium guijava and Artocarpus heterophyllus) and introduction of aromatic grasses (Cymbopogon wintcriamus, Pandanus odoratissimus L. and Cymbopigon flexuosus Stapt) were suggested in fallow lands.


Environmental Earth Sciences | 2005

Nature and profile distribution of iron and aluminum in relation to pedogenic processes in some soils developed under tropical environment in India

R. Bera; A. Seal; M. Banerjee; Ajit Kumar Dolui


Archive | 2014

Adoption of Inhana Rational Farming (IRF) Technology as an Organic Package of Practice towards Improvement of Nutrient Use Efficiency of Camellia Sinensis through Energization of Plant Physiological Functioning

Ashis Kumar Chatterjee; Arun Kumar Barik; Gopal Chandra De; Ajit Kumar Dolui; Debasis Mazumdar; Anupam Datta; Susmita Saha; Ranjan Bera; Antara Seal


Nigerian Journal of Soil and Environmental Research | 2006

Characterization of tropical soils in the fringe of Chhotanagpur Plateau in Eastern India for land use planning

Ranjan Bera; Antara Seal; K Mukherjee; Ajit Kumar Dolui


Turkish Journal of Agriculture: Food Science and Technology | 2017

Evaluation of an Organic Package of Practice Towards Green Gram Cultivation and Assessment of its Effectiveness in Terms of Crop Sustainability and Soil Quality Development

Antara Seal; Ranjan Bera; Rupkatha Roy Chowdhury; Koushik Mukhopadhyay; Sudipta Mukherjee; Ajit Kumar Dolui

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Antara Seal

University of Calcutta

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Ranjan Bera

University of Calcutta

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A Seal

Visva-Bharati University

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R Bera

Visva-Bharati University

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A. Mondal

University of Calcutta

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A. Seal

Indian Council of Agricultural Research

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Debashis Mazumdar

Bidhan Chandra Krishi Viswavidyalaya

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