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Articles by Vimal Singh
Total Records ( 4 ) for Vimal Singh
  Jay Prakash Verma , Janardan Yadav , Kavindra Nath Tiwari , Lavakush and Vimal Singh
  Rhizospheric soils of crop plants have more flora and fauna due to availability of more organic compound, macronutrient and micronutrient. Rhizobacteria that exert beneficial effects on plant growth and development are referred to as Plant Growth Promoting Rhizobacteria (PGPR). Plant growth promoting rhizobacteria is a group of free living soil bacteria, which have ability to promote growth and yield of crop plant by direct and indirect mechanism. PGPR is generally two type, one is colonies inside plant cells that called intracellular PGPR (iPGPR) and other colonies out side plant in rhizosphere that called extracellular PGPR (ePGPR). This review generally focused on direct and indirect mechanism of PGPR. Direct mechanism of plant growth promotion may involve the synthesis of substances by the bacterium or facilitation of the uptake of nutrients from the environment. The indirect mechanism of plant growth occurs when PGPR lessen or prevent the deleterious effects of plant pathogens on plants by production of inhibitory substances or by increasing the natural resistance of the host. The search for PGPR and investigation of their mode of action are increasing at a rapid use as commercial biofertilizers. The mode of action and practical application of PGPR in crop production are the major focus of this review.
  Jay Prakash Verma , Vimal Singh and Janardan Yadav
  The aim of this study was to find the effect of copper as a micronutrient for enhanced plant growth, protein content and antioxidant enzyme activity of mungbean (Vigna radiata) under the influence of different concentrations of copper. The effect of various copper sulphate solution has insignificant effect on the percent germination of mungbean while plumule and radicle length decreased with increase in copper concentration (50, 200, 500 and 1000 μM copper sulphate solution). Total protein content in root was significantly higher (127.7%) than shoot (83.7%) as compared to control. Peroxidase activity, in case of shoot, increases with increase in copper sulphate concentration i.e., (1.423 of control to 1.713, 2.29, 2.52, 2.88 and 3.02 OD/min/mg protein in different copper sulphate solutions treatments after 72 h) while for the root copper sulphate solution has negative effect on the peroxidase activity i.e., (11.41 of control to 11.19, 10.85, 10.04, 9.73 and 9.40 OD/min/mg protein in different copper sulphate solutions treatments after 72 h). The present experiment revealed that copper is an essential micronutrient which promoted the seedlings growth at less than 50 μM concentration. Higher concentration significantly decreases shoot and root length. The protein concentration in both shoot and root of the seedling was recorded to be enhanced with increase in the concentration of copper sulphate as compared to control. POD activity in root decreased at higher levels of copper concentration while POD activity in shoot increased with increasing concentration.
  B.R. Maurya , Vimal Singh and P.P. Dhyani
  Abundance of various kind of microorganisms and their activity in soil is a presumptive of fertility status of that soil. Hence, the present study was designed to assess the impact of altitudes on activity of two important soil health bioindicators in agricultural soils of Almora district of Central Himalaya. Seventy two soil samples were collected from agricultural lands at different altitudes of Almora, Uttarakhand, India and were assayed for their electro-chemical properties microbial colony forming unit (cfu) and microbial activities such as dehydrogenase and phosphatase following the standard procedures. It was recorded that soil was acidic in range with nitrogen, phosphorous and potassium in middle to high range. Also their content in soil increased at high altitude as compared to low altitude. Dehydrogenase and phosphatase activities varied with altitudes and these were high at higher altitudes. Dehydrogenase possessed a significant and positive correlation with nitrogen (r = 0.83) and phosphorous (r = 0.64) while phosphatase showed significant and positive correlation with organic carbon (r = 0.66). It was concluded that activity of dehydrogenase and phosphatase in soil would be an effective tool to assess the soil health.
  B.R. Maurya , Ashok Kumar , Richa Raghuwanshi and Vimal Singh
  Azotobacter and Azospirillum are known as non symbiotic free living nitrogen fixing biofertilizer microorganisms which actively participate in nutrients cycles. In eastern Uttar Pradesh of India, there is a great diversity in various cropping systems that may possess variation in these important biofertilizer microorganisms. The present study was conducted in order to chalk out the diversity of Azotobacter and Azospirillum sp. in different districts of eastern Uttar Pradesh in India with respect to the prevailing cropping system. Sixty two soil samples were collected from different crop rotations namely rice-wheat, vegetables, agroforestry and grassland for enumerating the diversity of Azotobacter and Azospirillum. The result showed that the Azotobacter population in rice-wheat, vegetables, agroforestry and grassland based crop rotations varied from 10x105 -13x105, 12x105-16.5x105, 9x105-15.5x105 and 7x105-10.5x105 CFU g-1 soil, respectively. Population of Azospirillum in rice-wheat, vegetables, agroforestry and grassland based crop rotations varied from 5.5x105-10.5x105, 6.5x105-12x105, 5x105-13x105 and 4.5x105-10x105 CFU g-1 soil, respectively. The diversity in population density of Azotobacter was maximum in soil of agroforestry followed by vegetables, grassland and lowest in rice-wheat based crop rotations, while in case of Azospirillum diversity was maximum in agroforestry and the lowest was observed in the rice-wheat but similar diversity present in vegetables and grassland crop rotations soil of eastern Uttar Pradesh. Overall maximum diversity of both the biofertilizer micro-organisms occurred in agroforestry based crop rotation.
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