A.K. Nayak

A.K. Nayak
Central Rice Research Institute · Division of Crop Production

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291
Publications
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Publications

Publications (291)
Article
Full-text available
NrfA is the molecular marker for dissimilatory nitrate reduction to ammonium (DNRA) activity, catalysing cytochrome c nitrite reductase enzyme. However, the limited study has been made so far to understand the structural homology modeling of NrfA protein in DNRA bacteria. Therefore, three model DNRA bacteria (Escherechia coli, Wolinella succinogene...
Article
One of the major challenges in Asian countries is the effective management of rice straw. These countries grow more rice, and hence, more straw, to ensure food security for their ever-growing population. The unfortunate instances of burning rice straw are detrimental to environmental as well as human health. Rice straw, if managed effectively, has...
Article
Scarcity of water and emissions of greenhouse gases (GHGs) are the two key environmental issues for crop production in India. Reduction of carbon footprint (CF) and water footprint (WF) from crop production can help to address the environmental hazards created from scarcity of water and GHG emissions. The CF and WF of rice, wheat and maize were est...
Technical Report
Biofertilizers contain living microorganisms that colonize the rhizosphere or interior of the plant and promote growth by increasing the supply or availability of primary nutrients to the host plant when applied to seed, plant surfaces, or soil. They are a viable alternative to chemical fertilizers because they add nutrients through natural process...
Article
Full-text available
Conversion of mangrove vegetation into rice cultivation is considerably enhanced nowadays which adversely affects ecological sustainability. Soil microbial community is one of the key indicators to monitor soil health in mangroves. Studies on the variations in the microbial community within mangroves are plenty, whereas reports in mangrove-converte...
Chapter
Full-text available
The growing demand of rice has to be met by increasing production with less resources viz. land, water and manpower; and by optimizing usage of all agricultural inputs for which precise management of inputs are considered very important. Precision Farming (PF) assists in identifying, analysing, and managing the spatial and temporal variability of d...
Article
Out of the huge quantity of agricultural wastes produced globally, rice straw is one of the most abundant ligno-cellulosic waste. For efficient utilization of these wastes, several cost-effective biological processes are available. The practice of field level in-situ or ex-situ decomposition of rice straw is having less degree of adoption due to it...
Article
Coastal areas in eastern India faces land use and land cover change (LUCC) due to agricultural and socio-economic intensification. Assessing the value of ecosystem services (ES) from these areas is vital for ensuring sustainable management. This study aimed to evaluate the variation in the value of ES due to LUCC changes from 1990 to 2018 in six co...
Article
Full-text available
We hypothesized that lignin decomposition microbial consortium would make rice-straw decomposition faster as straw contain around 15–24% lignin. In this study, we isolated aerobic lignin degrading microbes from four natural sources and based on their ability towards lignin degradation four microbial strains and their combination (2 bacteria (LB 8,...
Article
Full-text available
To prevent weed invasion in direct seeded rice cultivation, several new generation post emergence herbicides viz. bispyribac sodium, flucetosulfuron, ethoxysulfuron, fenoxaprop-p ethyl, penoxsulam, fenoxaprop-p-ethyl plus ethoxysulfuron and cyhalofop-butyl plus penoxsulam are widely used in sub-tropical rice ecosystems of Eastern India. The main ob...
Article
Full-text available
This study addresses the plant beneficial enterobacteria present in rice rhizosphere and their efficiency for enhancing nitrogen uptake in rice plant. Using culturable approaches, the population of total diazotrophs present in rhizosphere samples collected from different organic rice fields of Sikkim were studied and recorded in the range between 4...
Article
Salinity-tolerant Azolla is generally screened under hydroponics condition but its applicability under ex situ and in vivo is very challenging mainly because of stress heterogeneity, presence of other soil-related stresses and the significant influence of environmental factors such as temperature, relative humidity and solar radiation. Therefore, t...
Conference Paper
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The earlier studies on trend analysis are mostly concentrated on precipitation event only. For a more detailed understanding of extreme weather events impacts on agriculture, together analysis of precipitation and temperature trend is very important. The results from this study clearly show the increasing trend of extreme weather events of rainfall...
Article
Mitigation of greenhouse gas (GHG) emission and reduction of straw burning are two major environmental challenges faced by rice production systems. Open-field straw burning causing air pollution, health hazards, nutrients and biodiversity losses needs to be tackled through management practices. Emissions of methane and nitrous oxide are issues in r...
Preprint
Full-text available
PurposeMicrobial communities in rhizospheric soil play a significant role in sustaining the soil quality and also recognized as key ecological indicators to assess the soil health. Methods We studied the long-term effects of resource conservation technologies on functional microbial diversity and their interactions with soil biochemical properties...
Article
The effect of long-term fertilizer and manure applications on short-range order (SRO) and crystalline mineral transformation was studied in a 47-year puddled rice-rice cropping system experiment in Odisha, India. The relationship of SRO minerals with phosphorus and potassium fixation capacity and soil carbon fractions was also evaluated. Soils from...
Preprint
Full-text available
Consecutive five-year long eddy covariance measurements in a lowland tropical rice-rice system were used to investigate the impacts of gross primary productivity (GPP), climate drivers and ecosystem responses (i.e. ecosystem respiration, RE) on the inter-annual variability (IAV) of the net ecosystem exchange (NEE), which is directly related to the...
Article
Full-text available
Understanding the spatial spreading patterns of plant-available sulphur (S) (AS) and plant-available micronutrients (available zinc (AZn), available iron (AFe), available copper (ACu), available manganese (AMn) and available boron (AB)) in soils, especially in coastal agricultural soils subjected to various natural and anthropogenic activities, is...
Article
Full-text available
Accurate measurements of actual evapotranspiration (ETa) and crop coefficients (Kc) are essential to know crop water requirements and to improve irrigation scheduling. The eddy covariance (EC) technique is increasingly being used to do so. Precise information on Kc for lowland rice is essential for local- and regional-scale irrigation planning but...
Article
A long-term field experiment was conducted at Institute research farm, ICAR-National Rice Research Institute, Cuttack, Odisha since 2012-13. The experiment was conducted in a split plot design involving two cropping systems i.e., rice-maize-cowpea (R-M-C) and rice-groundnut-cowpea (R-G-C) covering three crops in three seasons i.e., kharif, rabi and...
Article
Methane (CH4) and nitrous oxide (N2O) emissions coupled with climate change are issues which are of great concern for modern rice cultivation. It is very difficult and costly affair to quantify the CH4 and N2O emissions at regional and national scales due to large scale spatial and temporal variability in soil and crop management practices. In this...
Article
This group has previously reported the role of ascorbic acid (AA) as an antioxidant for survivability and ability to enhancing diazotrophic efficacy in Azotobacter chroococcum Avi2 under hydrogen peroxide (H2O2) stress. However, the present study showed the combined application of AA and Avi2 in drought-susceptible (IR64 and Naveen) and drought-tol...
Article
Full-text available
A study was conducted to examine the interrelationships among socioeconomic factors, household consumption patterns, calorie intake and greenhouse gas emissions factors in rural eastern India based on household survey data. Findings indicated that higher monthly per capita incomes (12.1–80.1$) were associated with greater average calorie intakes (2...
Technical Report
Full-text available
Technical Bulletin on Rice Fish Duck Integrated Farming System for Enhancing Farm Productivity
Technical Report
Full-text available
Technical bulletin on Crop-Livestock-Agroforestry based integrated farming system for higher productivity in lowland rice ecologies
Article
Full-text available
Trend analysis of annual rainfall over the coastal districts of Odisha, India showed statistically non-significant increasing trend in all districts, except Ganjam. Whereas the maximum and minimum temperature showed significant increasing trend. Warming in these districts is mainly due to increasing minimum temperature during summer and rainy seaso...
Preprint
Full-text available
The study investigates trend in extreme daily precipitation and temperature over coastal Odisha, India. 18 weather indices (8 related to temperature and 10 related to rainfall) were calculated using RClimDex software package for the period 1980–2010 . Trend analysis was carried out using linear regression and non-parametric Mann-Kendall test to fin...
Article
Full-text available
To better understand the early response of genotypes to limited-phosphorus (P) conditions and the role of the phosphate transporter OsPHT1 gene family in the presence of PSTOL1, it is essential to characterize the level of tolerance in rice under limited-P conditions. In the present experiment, six rice genotypes were studied in three-way interacti...
Article
Taxonomy of Azolla was extensively studied, but still its identification based on morphological, physiological, and reproductive structure remains unclear. Hence, an attempt was made to differentiate Azolla strains based on morphological and physiological traits, keeping six known Azolla (Azolla microphylla, Azolla caroliniana, Azolla mexicana, Azo...
Article
Full-text available
To better understand the early response of genotypes to limited-phosphorus (P) conditions and the role of the phosphate transporter OsPHT1 gene family in the presence of PSTOL1, it is essential to characterize the level of tolerance in rice under limited-P conditions. In the present experiment, six rice genotypes were studied in three-way interacti...
Chapter
Reduction in the emission of methane is a challenge to the global scientific community. The global warming potential of methane is about 28–36 making it capable of trapping heat in the atmosphere and contribute to global warming. In this chapter we have described the mechanism and various pathways of methane formation, and discussed the mechanism o...
Article
Full-text available
Accumulation of arsenic (As) from soils-water system to human diets poses a serious health risk to humans, as it is considered the class I carcinogenic element. Arsenic contaminated groundwater is used not only for drinking purpose but also for crop irrigation, particularly for paddy rice, in South and South-East Asian countries. In India, arsenic...
Article
Characterization of carbon dioxide (CO2) fluxes was investigated in tropical lowland flooded rice ecology using open path eddy covariance (EC) technique during dry season of 2009–2010. Select environmental variables like air and soil temperatures, soil moisture, net radiation, photosynthetically active radiation, vapour pressure deficit and soil he...
Article
Full-text available
Climate change is widely recognized as one of the most pressing issues confronting humanity today. It is considered to be a direct threat to our food production system including rice. Climate change affects rice production in various ways. The variability in temperature and precipitation increases, predictability of seasonal weather patterns reduce...
Article
Enhancing the productivity of crops while reducing the environmental footprint are the major challenges especially for rice farming. Precison farming helps in optimising inputs such as fertilizers and water in tune with crop requirement recognizing the spatial and temporal variabilities within and across field. The precision tools viz. Remote sensi...
Article
An appropriate nitrogen (N) management strategy is required for minimizing the yield loss incurred in aerobic direct-seeded rice (ADR) due to moisture stress. Field experiments for two consecutive years were conducted to evaluate comparative performance of real-time application of neem-coated urea (NCU) and prilled urea (PU) using a customized leaf...
Article
Full-text available
The realisation of low farm income from the farming sector invariably caused agrarian distress among farming communities caused economic and social problems poses detrimental effects on agricultural farming. Suitable integration of rice farming with other crops, fish, livestock and agroforestry components and up scaling with newer varieties of cash...
Article
Understanding the effect of elevated atmospheric CO2 on nitrous oxide (N2O) emission and plant-microbe interactions in rice soils is of great significance for predicting the long-term response of rice ecosystems to elevated CO2 concentration. Elevated atmospheric CO2 concentration has the potential to augment rice production and alter the soil nitr...
Article
Phosphorus (P) is a major limiting factor for plant growth. Long-term organic fertilization increases P availability by improving soil microbial and chemical properties. To study this, rice was grown under different treatments, namely, control, farmyard manure (FYM), green manure (GM), FYM + GM (1:1) (FYGM), FYM + Azolla (1:1) (FYAZ), rice straw (5...
Article
Rice is a crop of primary importance in regions, where two-thirds of the world’s starving population reside. Recent climate change projections anticipate spatial shift in precipitation pattern and increase of flooding events that may have negative effects on rice yield and economic returns. Efforts for increasing rice production in areas prone to s...
Article
Open field rice strawburning causes air pollution, GHGs emission (7300 kg CO2-equivalent per hectare), soil nutrient and biodiversity losses and human health hazards. Huge amount (731 million tons (MT)) of rice straw is produced globally in which India contributed around 126.6 MT, and 60% of them are burnt on the field. Once a wealth, the straw now...
Article
Genetic diversity assessment and population structure analysis are essential for characterization of pathogens and their isolates. Markers are essential tools for exploring genetic variation among the isolates. False smut of rice caused by Ustilaginoidea virens, formerly Villosiclava virens, is a major emerging disease of rice in India. A high leve...
Preprint
Full-text available
We hypothised that lignin decomposition microbial consortium would make rice-straw decomposition faster as straw contain around 15–24% lignin. In this study, we isolated lignin degrading microbes from four natural sources and based on their ability towards lignin degradation four microbial strains and their combination (2 bacteria (LB 8, LB 18) and...
Article
Full-text available
Conservation agriculture (CA)-based experiments were conducted at various locations in Indo-Gangetic Plains (IGP) of India in rice-based and other cropping systems. A triple ZT system at IARI, New Delhi, involving zero tillage DSR (ZTDSR) with green gram (GG) residue (GGR)-ZT wheat (ZTW)/ZT mustard (ZTM) with rice residue (RR)-ZTGG with wheat resid...
Technical Report
Full-text available
Complete Details ofTechnology: : The following three bacterial strains viz., nitrogen fixer (Azotobacter chroococcum(NCBI: MT186700), phosphate (Bacillus megaterium (NAIMCC-B-02287) andpotassium solubilizers (Pseudomonas putida NCBI: MT020300) were used forbiofertilizer consortium preparation. Three bacterial strains were selected based ontheir pla...
Technical Report
Full-text available
Complete Details ofTechnology: : The following three bacterial strains (B. subtilis BioC-WB (NAIMCC-B-02285), B.luciferensis K2 (NAIMCC-B-02286) and B. amyloliquiefacies K12 (NAIMCC-B-02288)were used for microbial consortium preparation. All the selected bacterial strains wereassessed for their antagonistic potential against some important plant pa...
Article
Rainfed rice agro-ecosystems play an important role in food production, and there is a huge scope for utilizing residual moisture in rice fallows to cultivate short-duration and low input demanding crops. However, the success of crops grown on rice fallows largely depends on the method and cultivars of rice adopted. Therefore, we examined the perfo...
Technical Report
Full-text available
Technical Bulletin on Vermicomposting