Dissertation > Excellent graduate degree dissertation topics show

Role of Biofertilizer on Regulating Soil Nutrition and Improving Quality of Tobacco Leaves

Author: ShangCui
Tutor: ChenGuiQiu
School: Hunan University
Course: Environmental Engineering
Keywords: Biofertilizer Phanerochaete chrysosporium Bacillus thuringiensis Tobacco Nitrogen
CLC: S158
Type: Master's thesis
Year: 2013
Downloads: 87
Quote: 0
Read: Download Dissertation


Tobacco is one of the most important economic crops and is widely plantedthroughout China. Over years, large amounts of synthetic fertilizers and pesticideshave been applied to farmland for the purpose of obtaining a high yield; however, theindiscriminate use of chemical fertilizers and pesticides has caused a series ofnegative impacts on croplands. It has increased soil contamination with heavy metalsand residual pesticides which damaged the soil eco-environment, thereby destroyingthe microbial community structure, making crops more prone to diseases and reducingsoil fertility. All these unfavorable circumstances not only have serious implicationsfor tobacco leaves quality, but also impede the sustainable development ofagriculture.In the present study, a combination of organic fertilizer, soil ameliorant andbiofertilizer was used in preparing a novel type of biofertilizer which containedPhanerochaete chrysosporium and Bacillus thuringiensis (BFPB). Rapeseed cake wasused as the microorganism carrier, and bentonite was added for improving soil waterand nutrient conservation. To determine the effect of P. chrysosporium and B.thuringiensis, respectively, two other biofertilizers were prepared as follows:(i) oneprepared according to BFPB without B. thuringiensis (BFP); and (ii) the otherprepared without P. chrysosporium (BFB). All these biofertilizers were used as basefertilizer with the purpose of improving soil conditions for the growth of Yunyan87.As control, pure rapeseed cake was used at the same way with biofertilizers. Soilsamples were collected during the tobacco growth season, including resettli ng growthstage, vigorous growing period, topping, and maturity stages of lower, middle, andupper leaves to exploring the influence of biofertilizers on soil nitrogen-supplying.Mature lower, middle, and upper leaves were collected for analysis of tobacco quality.Experiment results showed that biofertilizer had no influence on soil totalnitrogen. By contrast, soil available nitrogen and enzymes were deeply affected bybiofertilizer. NO3--N content and nitrate reductase activity in biofertilizer-amendedsoil increased by92.3%and42.2%, respectively, compared to those in the control,whereas the NH4+-N and urease activity decreased by37.8%and29.3%, respectively.Nitrogen uptake was improved in the early growing stage, but this phenomenon wasnot observed during the late growth period. The biofertilizer caused an increase of total nitrogen in lower and middle leaves compared with control, while a decrease oftotal nitrogen was observed in upper leaves. Protein concentration in different tobaccoleaves had similar fluctuation to that of total nitrogen in response to biofertilizer. Thebiofertilizer can also reduce the nicotine content in tobacco leaves, with a maximumdecrement of16%–18%being observed in the in upper leaves. This study is importantfor the development of new biofertilizer and its application in improving soilecological environment and tobacco quality.

Related Dissertations

  1. Experimental Research on Influence of Coal Reburning Reaction Conditions on NO_x Reduction by Non-Catalytic Reduction of Ammonia,X701
  2. Cultivation and Effects of Environmental Factors on Carrying WSSV Virus of Litopenaeus Vannamei,S945
  3. Effects of Light, Temperature and Nitrogen on the Growth of Three Kinds of Aquatic Plants,Q945
  4. Design, Synthesis and Antitumor Activities Study of Quinoxaline-1,4-dioxide Derivatives,R914
  5. Study on the Synthesis and Adsorption Behaviour of Chitosan Derivative,TS254.9
  6. Application of Numerical Designing Cigarette Blending Formula on Computational Intelligence,TS44
  7. Research on the Laws of Nitrogen and Phosphorus Loss and Control Scheme in Eryuan Rural,X712
  8. The Effects of Overexpression of OsSsr1 on Stress Tolerance in Tobacco,S572
  9. Study on Effect of Nutritional Regulation on Pig Production Performance and Discharge of Nitrogen and Phosphorus,S828.5
  10. Effects of Varying Levels of Potassium Supplementation to the Low Salinity Waters or Diets on Growth and Physiological Characteristics of Shrimp, Litopenaeus Vannamei, Boone,S963
  11. Effect of Invasive Plants (Conyza Sumatrenss and Alternanthera Philoxeroides) on Soil Carbon and Nitrogen Processes,X173
  12. An Application of Real-Time PCR in the Study of Biological Control of Tobacco Wilt Disease,S435.72
  13. Insecticidal Activities of Recombinant CryIAc Protein from Bacillus Thuringiensis and Solid Fermentation Products from Aspergillus Terreus PNR2,S476.1
  14. The Study of the Fitness Difference of Helicoverpa Armigera (Hübner) and Helicoverpa Assulta (Guenée) Fed with Different Pepper Varieties,S436.418
  15. Preparation and Biological Effects of a Bio-Organic Fertilizer Against Tobacco Black Shank Disease,S435.72
  16. Accumulation of High Molecular Weight Glutenin Subunits in Wheat Grain as Regulated by Nitrogen Rate,S512.1
  17. Monitoring Nitrogen Status and Growth Characters with Canopy Spectral Reflectance in Summer Maize,S513
  18. Responses of the Double-Cropping Rice Population Growth and Nitrogen Uptake to Density and Nitrogen Management and the Diagnosis Based on NDVI,S511
  19. Analysis of Attributes of Quality and Soil Factors on Style of Fen-flavor Flue-cured Tobacco in Qujing District,S572
  20. Effects of Leaf Trait and Water-Fertilization Status on the Contents of Main Volatile Aroma Components in Flue-cured Tobacco of Central Henan,S572
  21. Influences of Density and Potassium Interaction on Physio-ecological Indicators and Quality of Flue-cured Tobacco in Yanbian,S572

CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil fertility (soil fertility )
© 2012 www.DissertationTopic.Net  Mobile