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Soil Health Assessment Methods and Relationship with Wheat Yield

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Open Journal of Soil Science 2019年第9期9卷 189-205页

作者： Jatish C. Biswas naveen kalra M. Maniruzzaman U. A. Naher M. M. Haque Bangladesh Rice Research Institute & Coordinator KGF Dhaka Bangladesh Indian Agricultural Research Institute New Delhi India Bangladesh Rice Research Institute Gazipur Bangladesh

Soil quality assessment methods, based on different attributes, are available but not well calibrated/validated for subsequent operational applications. We have developed a method for soil quality index assessment by considering soil texture, organic carbon, pH, available water, cation exchange capacity, bulk density, total porosity, saturated hydraulic conductivity, salinity, aggregate stability, slope and soil depth. The scoring was done on 0 - 100 scale and the lowest score was assigned to the most limiting factor of crop growth and development. Attribute-wise rating was made by using Macros developed in MS-Excel and IDRISI3.2 was used to delineate the rating maps. About 64.6% soils scored more than 60 and the best soil group (score > 70) was only about 15%. Soil health score, as determined through our method, showed good relationship with wheat yield. Multiplicative response function was more sensitive than simple regression model. The correlation analyses with one or two attributes with most severe stress and relatively with lower rating values showed better predictability of wheat yields. The soil quality index as estimated from principal component analysis having strongly loaded (>0.75) factors showed inferior correlation with grain yields of wheat than geometric mean approach. It is concluded that geometric mean approach for soil health scoring can be utilized in similar environments around the globe with or without further improvement.

关键词： Soil Quality Additive and Multiplicative Function PCA Minimum Data

Indian patients with nonalcoholic fatty liver disease presenting with raised transaminases are different at presentation

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World Journal of Gastroenterology 2007年第4期13卷 649-650页

作者： Ajay Duseja Ashim Das Radha Krishan Dhiman Yogesh Kumar Chawla Reena Das Sanjay Bhadada Ravinder Sialy Kiran Kumar Thumburu Anil Bhansali naveen kalra Department of Hepatology Postgraduate Institute of Medical Education and Research Chandigarh India Department of Histopathology Postgraduate Institute of Medical Education and Research Chandigarh India Department of Hematology Postgraduate Institute of Medical Education and Research Chandigarh India Department of Endocrinology Postgraduate Institute of Medical Education and Research Chandigarh India Department of Radiodiagnosis and Imaging Postgraduate Institute of Medical Education and Research Chandigarh India

TO THE EDITORWe read with great interest the article, 'Non-alcoholic fatty liver disease may not be a severe disease at presentation among Asian Indians' by Madan et al in the recent issue of WJG. Twenty-eight (55%) out of 51 patients with nonalcoholic fatty liver disease (NAFLD) who presented with abnormal transaminases had histological evidence of nonalcoholic steatohepatitis (NASH).

关键词：印度脂肪肝转氨酶肝病

Locoregional treatment for hepatocellular carcinoma:The best is yet to come

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World Journal of Radiology 2015年第10期7卷 306-318页

作者： naveen kalra Pankaj Gupta Yogesh Chawla Niranjan Khandelwal Deparment of Radiodiagnosis and Imaging PGIMER Deparment of Hepatology PGIMER

Hepatocellular carcinoma(HCC) is the sixth-most common type of cancer worldwide. The only definitive treatment modalities capable of achieving a cure are hepatic resection and hepatic transplantation. However, most patients are not candidates for these therapies. Overall, treatment options are driven by the stage of HCC. Early-stage disease is treated with ablative therapies, with radiofrequency ablation the ablative therapy of choice. Microwave ablation and irreversible electroporation are the other upcoming alternatives. Intermediate-stage disease is managed with transarterial chemoembolization(TACE), while advanced-stage disease is managed by sorafenib, with TACE and radioembolization as other alternatives.

关键词： Hepatocellular carcinoma High intensity focussed u

Simulating Nitrogen and Irrigation Effects on Wheat Production in Bangladesh under Changing Climate

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American Journal of Plant Sciences 2017年第7期8卷 1593-1606页

作者： Ranjit Sen Apurba Kanti Choudhury Sohela Akhter Sheikh Ishtiaque Md. Abu Hena Sorwar Jahan Faruque Ahmed Jatish Chandra Biswas Md. Maniruzzaman Md. Main Uddin Miah Md. Mizanur Rahman naveen kalra Md. Abdul Aziz A. S. M. Mahbubur Rahman Khan Bangladesh Agricultural Research Institute Gazipur Bangladesh Bangladesh Rice Research Institute Gazipur Bangladesh Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh CRP-II Project Krishi Gobeshona Foundation (KGF) Dhaka Bangladesh

Climate change impacts are visible in Bangladesh which requires adoption of judicious crop management practices for sustainable agriculture. Crop simulation models are effective in this regard and can be used for optimizing water and nitrogen inputs for maximization of wheat yields. Two field studies were conducted at Bangladesh Agricultural Research Institute (BARI) for evaluating the effect of increased temperature on wheat production under variable water and N rates, through the use of DSSAT v4.6 model. Thirty years historic weather data and BARI Gom-26 wheat-cultivar coefficients, as generated through use of GLUE of DSSAT model, were used for evaluating the impact of temperature rise with variable rates of irrigation water and nitrogen. The effects of four levels of nitrogen (0, 40, 80 and 120 kg ha-1) and four irrigation levels [0 (no irrigation), 1, 2 and 3] on wheat yield were evaluated under 0°C, 1°C, 2°C and 3°C rise in temperature. Simulation results indicated that wheat yield increased with increase in nitrogen application rate, but decreased with the temperature rise. Crop growing duration was reduced by about five days for each degree rise in temperature, irrespective of levels of irrigation water and nitrogen-rates. In general, there was yield reduction of 8.13, 16.77 and 24.97 % with increased temperature of 1°C, 2°C and 3°C, respectively, when compared with no temperature rise treatment. For interaction of temperature rise-N dose, the magnitude of yield decline under temperature rise was higher with increased dose of N. Agronomic N use efficiency at different N rates and temperature rise level were calculated. N use efficiency decreases with the increase in temperature rise and the highest (29.95 kg grain kg-1 N) was obtained from 40 kg N ha-1 treated plot with 0°C temperature rise i.e. existing atmospheric temperature. Simulation results indicated increase in wheat yield with higher levels of irrigation water, and interaction of irrigation level with temperature ri

关键词： Climate Change Wheat Temperature Rise Irrigation Nitrogen Bangladesh

Calibration and Validation of Decision Support System for Agro-Technology Transfer Model for Simulating Growth and Yield of Maize in Bangladesh

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American Journal of Plant Sciences 2017年第7期8卷 1632-1645页

作者： F. Ahmed Apurba K. Choudhury S. Akhter M. A. Aziz Jatish C. Biswas M. Maniruzzaman M. Main Uddin Miah M. M. Rahman M. A. H. S. Jahan Imrul Mosaddek Ahmed R. Sen S. Ishtiaque A. F. M. Tariqul Islam M. M. Haque M. Belal Hossain naveen kalra M. Hafijur Rahman Bangladesh Agricultural Research Institute Gazipur Bangladesh Bangladesh Rice Research Institute Gazipur Bangladesh Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh Consultant CRP-II Project KGF Dhaka Bangladesh

Maize is an emerging important crop in Bangladesh because of its high yield potential and economic profitability compared to rice and wheat crops. There is a need to understand the growth and yield behavior of this crop in varying production environments of Bangladesh. Crop model such as Decision Support System For Agro-technology Transfer (DSSAT) version 4.6 (DSSAT hereafter) can be utilized cost effectively to study the performances of maize under different production environments. It needs to calibrate and validate DSSAT model for commonly cultivated maize cultivars in Bangladesh and subsequently take the model to various applications, including inputs and agronomic management options and climate change that impacts analyses. So, the present study was undertaken to firstly calibrate DSSAT model for popular four hybrid maize cultivars (BARI Hybrid Maize-7, BARI Hybrid Maize-9, Pioneer 30B07 and NK-40). Subsequently, it proceeded with the validation with independent field data sets for evaluating their growth performances. The genetic coefficients for these cultivars were evaluated by using Genotype coefficient calculator (GENCALC) and Generalized likelihood uncertainty estimation (GLUE) module of DSSAT on the basis of first season experiment. The performance of the model was satisfactory and within the significant limits. After calibration, the model was tested for its performance through validation procedure by using second season data. The model performed satisfactorily through phenology, biomass, leaf area index (LAI) and grain yield. Phenology, as estimated through days to flower initiation and maturity, was in good agreement, although simulated results were slightly over predicted compared to observed values but within the statistical significance limit...when compared with observed values at specific growth stages of the crop. The final yield values (10.12 to 10.59 t·ha-1) were in close agreement with the observed values (10.16 to 10.94 t·ha-1), as the percentage error was within tolerable limit (0.39% to

关键词： Calibration Validation DSSAT Model and Maize