Bidhan Chandra Krishi Viswavidyalaya

Navadwīp, India

Bidhan Chandra Krishi Viswavidyalaya

Navadwīp, India
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Pavana Kumar S.T.,Bidhan Chandra Krishi Viswavidyalaya | Mazumdar D.,Bidhan Chandra Krishi Viswavidyalaya
Indian Journal of Ecology | Year: 2016

Time series prediction of pest and natural enemies is most important for the crop management and minimizing the pesticide use and the Artificial neural network (ANN) model is most powerful Artificial intelligence (Al) machine learning models have the capacity to generalize more with less error and it is also important to investigate the convergence of the Back propagation (BP). In the present study separate and efficient neural network model was developed for Gall Midge, Brown Plant Hopper and Damsel fly and the model performance criteria such as RMSE, RMAE, CC, MEF, AIC and BIC was calculated for each stage and compared. Performance of the network at training, validation and testing stage checked using different number of epochs with minimum learning rate (0.01). Selection of best architecture was made based on Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC), that network with less AIC and BIC value were selected and which is free from over fitting. Therefore ANN methodology could be used to predict the incidence of pests and damsel fly (Natural enemy) for better management practice well in advance and to avoid the environmental pollution due to more use of chemical pesticides.

Mishra P.,Bidhan Chandra Krishi Viswavidyalaya
Annual Research and Review in Biology | Year: 2017

The experimental material for the present investigation was comprised of 38 genotypes of onion. These genotypes were sown in Randomized Complete Block Design with three replications, to estimate the genetic variability, heritability and genetic advance. Observations were recorded on the basis of ten random competitive plants selected from each genotype separately for morphological, yield and quality parameters were evaluated as per standard procedure. Analysis of variance revealed highly significant variance for all the traits depicting greater variability in the existing material. The mean performance of the genotypes revealed a wide range of variability for all the traits. The variation was highest for bulb yield per hectare followed by bulb yield per plant, plant height at 90 DAT, plant height at 60 DAT, plant height at 120 DAT, plant height at 30 DAT, days to maturity and bulb yield per plot. The PCV was higher than the GCV for all the characters. High PCV and GCV was observed for bulb yield per plant, neck thickness and pseudostem diameter, indicating greater diversity for these traits and their further improvement through selection. High heritability supplemented with high genetic advance as percentage of mean was manifested by bulb yield per plant followed by neck thickness, pseudostem diameter, polar diameter of bulb, number of leaves per plant at 120 DAT, pseudestem length, plant height at 120 DAT and equatorial diameter of bulb suggested that they can be improved through direct selection. Considerable variability was observed among the genotypes for foliage colour, foliage cranking, bulb shape and bulb colour. Foliage colour in green onion and shape and colour of onion bulb are most important characteristics to help customers in choosing cultivars on the market. © 2017 Dwivedi et al.

Sarkar S.,Bidhan Chandra Krishi Viswavidyalaya | Sarkar A.,Bidhan Chandra Krishi Viswavidyalaya
Indian Journal of Ecology | Year: 2017

The experiment was conducted in rabi seasons of 2009-2011 to study the effect of three irrigation regimes (rainfed, irrigation applied at V = -0.03 MPa at 30 cm soil depth and V = -0.03 MPa at 30 cm soil depth) as main plots and four phosphorus rates (0.25, 50 and 75 kg P2O5ha-1) as sub plots on the productivity and efficiency of broadbean. Highest seed yield and efficiencies were recorded when the crop was irrigated at l3- φ = -0.03 MPa at 30 cm soil depth. There was a significant increase in yield, production and economic efficiency with increasing levels of P application. Highest net returns and net return/rupee invested were obtained with the application of irrigation at l3- φ = -0.03 MPa at 30 cm soil depth along with 75 kg P2O5ha-1. Different irrigation and phosphorus levels altered the soil moisture extraction pattern in all 4 layers (0-15, 15-30, 30-45, 45-60 cm) and extraction rate increased with increasing moisture level in the soil. Significantly highest water use efficiency (WUE) was recorded under rainfed condition when crop was fertilized with 75 kg P2O5ha-1.

Chakraborti S.,Bidhan Chandra Krishi Viswavidyalaya
Journal of Entomological Research | Year: 2017

An alternate management system for termites in sugarcane was evaluated. The system included reduced frequency of application of synthetic organic pesticides (single application) as compared to standard chemical method, use of phytochemical (dry chilli powder) and food-bait trap (fish bladder) for predatory ant, Tetraponera sp. That predated on termites. Alternate management system was found to be quite effective and reflected in form of lower germination failure (62-65% germination during 30-45 days after sowing) and seedling damage (8-13% damaged tillers during 30-90 days after sowing) in sugarcane as well as in the termite population counts (0.7-9.1/15 cm3/plot) and was at par with chemical check. Chlorfenapyr and imidacloprid were at par but imidacloprid was more toxic to non-target organisms, thus use of chlorfenapyr is the better and rationally more acceptable option. Chilli powder showed some sort of repellent activity and contributed in lowering field population density of termites. Food-bait strongly attracted wood ants and they substantially predated upon termites which was reflected in damage parameters as well as in termite counts. Pesticide alone and in combination with Metarhizium performed at par indicating that fungus could not exert significant influence on termite populations.

Thirupathi N.,Bidhan Chandra Krishi Viswavidyalaya | Ghosh S.N.,Bidhan Chandra Krishi Viswavidyalaya | Roy D.,Bidhan Chandra Krishi Viswavidyalaya
Indian Journal of Ecology | Year: 2017

The three years pooled data revealed that highest plant height (16.457 cm), stem girth (20.313 cm) and plant spread towards east-west (20.626 cm) and north-south (21.84 cm) were with the application of 265.6 g N + 725.6 g P + 622.4 g K (T2) through organic and inorganic fertilizer. Soil characters like pH, organic carbon, nitrogen and phosphorous, leaf nitrogen and leaf phosphorous were with 241.6 g N + 711.6 g P + 592.42 g K (T,), whereas, the highest soil potassium and leaf potassium contents were with the application of 328 g N + 828 g P + 620 g K (T7). The pooled analysis of three year data also indicates that 241.6 g N + 711.6 g P + 592.42 g K (T4), through organic and inorganic fertilizers showed highest fruit yield before monsoon (12.76 kg plant-1), total fruit yield (24.106 kg plant-1), maximum fruit length (7.767 cm), fruit breadth (8.033 cm) and fruit weight (189.463 g), juice content (74.613), TSS/acid ratio and minimum acidity (0.293) while, 265.6 g N + 725.6 g P+622.4 g K plant-1 (T2) through organic and inorganic fertilizer showed highest TSS (14.067 Brix) and total sugars (11.717 %). Application of 241.6 g N + 711.6 g P + 592.42 g K (T4) through three split doses was found as a good approach for production of high yield and good quality pomegranate fruits in a larger quantity before monsoon started (before June).

Patra S.K.,National Institute of Technology Rourkela | Deb M.,National Institute of Technology Rourkela | Patra A.,Bidhan Chandra Krishi Viswavidyalaya
Clinical Epigenetics | Year: 2011

Epigenetic regulations of genes by reversible methylation of DNA (at the carbon-5 of cytosine) and numerous reversible modifications of histones play importantroles in normal physiology and development, and epigenetic deregulations are associated with developmental disorders and various disease states, including cancer. Stem cells have the capacity to self-renew indefinitely. Similar to stem cells, some malignant cells have the capacity to divide indefinitely and are referred to as cancer stem cells. In recent times, direct correlation between epigenetic modifications and reprogramming of stem cell and cancer stem cell is emerging. Major discoveries were made with investigations on reprogramming gene products, also known as master regulators of totipotency and inducer of pluoripotency, namely, OCT4, NANOG, cMYC, SOX2, Klf4, and LIN28. The challenge to induce pluripotency is the insertion of four reprogramming genes (Oct4, Sox2, Klf4, and c-Myc) into the genome. There are always risks of silencing of these genes by epigenetic modifications in the host cells, particularly, when introduced through retroviral techniques. In this contribution, we will discuss some of the major discoveries on epigenetic modifications within the chromatin of various genes associated with cancer progression and cancer stem cells in comparison to normal development of stem cell. These modifications may be considered as molecular signatures for predicting disorders of development and for identifying disease states. © Springer-Verlag 2010.

Mukherjee A.,Bidhan Chandra Krishi Viswavidyalaya | Sarkar S.,Bidhan Chandra Krishi Viswavidyalaya | Chakraborty P.K.,Bidhan Chandra Krishi Viswavidyalaya
Agricultural Water Management | Year: 2012

During the winter season (November-March) of 2003-2004 and 2004-2005 a field study was carried out at the Research Farm of the University (Latitude 22°58'N, Longitude 88°31'E and altitude 9.75mamsl), Gayeshpur, India. Aim of the study was to evaluate the sole and interactive effect of irrigation frequencies and mulches on performance and water productivity functions of tomato crop. The experiment was composed of three irrigation frequencies {rainfed (RF); CPE 50 and CPE 25 where irrigation was given at 50 and 25mm of cumulative pan evaporation (CPE)}, kept in the main plots. The subplots consisted of four mulch managements {no mulch (NM), rice straw mulch (RSM), white polyethylene mulch (WPM) and black polyethylene mulch (BPM)}. Fruit yield under CPE 25 was 39.4Mgha -1; it reduced by 7 and 30% respectively under CPE 50 and RF condition. Different mulches increased fruit yield by 23-57% over non-mulch condition. Irrespective of mulching, water use efficiency (WUE), net evapotranspiration use efficiency (WUE ET) and irrigation use efficiency (WUE I) were found to be the highest (22kgm -3, 71kgm -3 and 22kgm -3 respectively) under moderately wet (CPE 50) soil environment. Among different mulches, BPM recorded the highest WUE (25kgm -3), WUE ET (73kgm -3) and WUE I (26kgm -3) values. Critical values of seasonal evapotranspiration (SET) against maximum WUE and maximum yield were computed through marginal analysis of water productivity function. It was observed that the difference between these critical values was narrowed down under bio or polyethylene mulches compared to the bare situation. © 2011 Elsevier B.V..

Barrow N.J.,University of Western Australia | Debnath A.,Bidhan Chandra Krishi Viswavidyalaya
Plant and Soil | Year: 2014

Aims: Enormous quantities of phosphate have been applied to world soils, yet we know little about effects of phosphate status on sorption properties. Methods: We measured sorption and desorption of phosphate on soils from fertilized tea plantations from northern India and compared them with unfertilized soils. We also incubated phosphate at high temperature with a previously unfertilized soil and measured the effects. Results: Sorption of phosphate was less marked on soils of high phosphate status whether derived from inherent fertility or fertilizer application. This occurred because high phosphate status made the surface charge on the reacting surfaces more negative. Phosphate status also affected desorption. The higher the phosphate status, the smaller the difference between sorption and desorption curves. This occurred because on soils of high phosphate status the pathways by which adsorbed anions diffuse were saturated and the slow reaction that follows adsorption was stopped. Conclusions: When low-phosphate soils are first fertilized, it is necessary to supply more phosphate than is removed in produce. However, after long-term phosphate fertilization, it is sufficient to only replace phosphate lost in produce. We need to find how much phosphorus it takes to reach this state and how many of the world's soils have already reached it. © 2014 Springer International Publishing Switzerland.

Sinha B.,Bidhan Chandra Krishi Viswavidyalaya | Bhattacharyya K.,Bidhan Chandra Krishi Viswavidyalaya
Biology and Fertility of Soils | Year: 2011

Organic fractions from farm yard manure (FYM), vermicompost, municipal sludge, mustard cake, and surface soil of West Bengal, which was arsenic (As)-contaminated, were extracted and fractionated into fulvic and humic acid (FA and HA, respectively) fractions following standard procedures. These HA and FA samples were characterized by pH-potentiometric titrations, viscometric measurements and visible spectrophotometry. The stability constant (logK) of the complexes formed by these natural with As in aqueous phase was evaluated by the ion-exchange method. The logK values suggest that the organo-As complexes were quite stable. The release isotherm of As from the HA/FA complexes extracted from vermicompost and FYM was assayed in the presence of molybdate, nitrate, phosphate, sulfate and borate. The greatest tendency to displace As from the complexes was shown by sulfate, molybdite, and nitrate. © 2011 Springer-Verlag.

Mitra S.K.,Bidhan Chandra Krishi Viswavidyalaya
Acta Horticulturae | Year: 2016

Mango is one of the common fruit in most continents, particularly in Asia, Central and South America and Africa. Global production of mangoes is concentrated mainly in Asia and more precisely in India which produces an average of 15 million t (MT) a year. Mangoes are now growing in more than 100 countries of which more than 65 countries produce each more than 1,000 MT a year. Total world production of mangoes is about 40 MT which played an integral part in the lives of many, not only by being a rich nutrient source but also as a source of livelihood for millions of peoples in the tropics. Mangoes were not commonly known among the consumers outside the tropics before 1960s and there was virtually no trade of fresh fruit. In recent years, mangoes have become well established as fresh fruit and processed products in the global market. World demand for mango is ascertained to be increasing particularly from temperate countries where mangoes are rapidly gaining in popularity. Leading importing country is US and in the EU it are the Netherlands, France, England, Portugal, Spain, Belgium, Denmark, and Sweden. Apart from India, other major producers of mango are China, Mexico, Thailand, Indonesia, Pakistan, Philippines, Nigeria, Brazil, Peru, Australia, South Africa, Malaysia and Venezuela. India's major marketing season is April to July while harvesting continued for 8-10 months a year in Brazil, Columbia, Kenya and Venezuela. The season is also quite long in Burkina Faso, Costa Rica, Indonesia, Jamaica, Mexico, Nicaragua, and Puerto Rico. There are many mango varieties grown in different countries; India alone have nearly 1,300 mango varieties (20 grown commercially) and Thailand have about 100 varieties. This paper discussed the present state of production of mango in the world and its future prospects.

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