Dissertation > Excellent graduate degree dissertation topics show

Effects of Water and Nitrogen Coupling on the Water and Nitrogen of Soil and Yield and Quality of Flue-cured Tobacco in Luzhou

Author: WangLiFang
Tutor: LiuGuoShun
School: Henan Agricultural University
Course: Tobacco science
Keywords: Water and nitrogen coupling Flue-cured tobacco nitrogen yield quality
CLC: S572
Type: Master's thesis
Year: 2011
Downloads: 2
Quote: 0
Read: Download Dissertation

Abstract


Field experiments on the coupling effect of water and nitrogen on the tobacco cultivar Yunyan 97 with irrigation have been conducted in the year of 2010.The influence of coupling effect between water and nitrogen coupling on the growth and the dynamic changes of water and nitrogen in the field yield, quality of the tobacco were studied in this experiment. The object was to provide theoretical evidence for the tobacco production. The main results were as follows:1. The content of soil moisture increased as the soil layer depth during the rosette stage of tobacco, but the content of soil moisture was decrease from the depth of 40 to 60 cm during the vigorous growing stage, and further increased. The content of soil moisture in the depth of 0 to 80cm was increased significantly by use of irrigation and nitrogen fertilizer, except the depth of 60 to 80 cm during the vigorous growing stage. The soil moisture content of the treatment without nitrogen increased with the irrigation increased. Overall, the soil moisture content during the rosette stage was higher than vigorous growing stage.2. Soil available nitrogen content reduced with the depth increase during the rosette stage and vigorous growing stage, the soil available nitrogen content reduced significantly in the depth of 40 to 80 cm of the treatment of no irrigation and moderate irrigation. From the whole, the content of soil available nitrogen of rosette stage was lower than vigorous growing stage.3. Irrigation increased plant height, stem circumference and maximum leaf area of tobacco and was beneficial to tobacco morphogenesis. But stem circumference and maximum leaf area of tobacco decreased with the increase of water level and nitrogen rate within the range of nitrogen 0~150 kg/hm~2.4. The dry matter accumulation of tobacco reach the most amount when the water level of 300m~3/hm~2 and nitrogen rate of 105 kg/hm~2 were applied after transplanting 75 days.5. In different treatment combination, the nicotine amount increased which reached maximum after the transplanting 45~60 days and the total nitrogen amount decreased along with promoting growth period. The irrigation had significant impact on nicotine content, and the nitrogen rate had greater impact on the total nitrogen content at every growth period.6. Regardless of irrigation, the total nitrogen content of tobacco leaves increased with increasing nitrogen rate. The nicotine, total sugar and reducing sugar content of irrigation increased first and then decreased. The combination of the middle irrigation amount (300m~3/hm~2) and the nitrogen rate of 75 kg/hm~2~105 kg/hm~2 had appropriate content of chemical components and better quality.7. The content of Ca in flue-cured tobacco increased with increasing nitrogen rate. The content of P、K and Ca content would increase through irrigation, while the content of Mg, Fe and Mn would decrease with increasing water amount.8. The petroleum ether extract content in flue-cured tobacco leaves would increase under the combination of irrigation and the nitrogen amount of 105 kg/hm~2.9. Irrigation obviously improved the total amount of aroma. The total amount of aroma under no nitrogen and the nitrogen amount of 105 kg/hm~2 increased as the water amount increased, while the remaining nitrogen treatment increased first and then decreased with increasing water amount. In the treatment of no irrigation and high irrigation, the total amount of aroma under the nitrogen rate of 105 kg/hm~2 was highest, and that of no nitrogen was lowest.10. The output value, average price and the proportion of high grade leaves under the combination of water amount of 300m~3/hm~2 and nitrogen rate of 105 kg/hm~2 were higher than other combinations, which reached 21195.69yuan/hm~2,10.97yuan/kg and 36.67%. The field of flue-cured tobacco increased as the nitrogen rate and water amount increased.

Related Dissertations

  1. Study on the Preparation of Biodiesel from Fried Oil with Supercritical Methanol,TE667
  2. Study on Theory and Experiment of Wire Drawing with Composite Ultrasonic Vibration,TG663
  3. Experimental Research on Influence of Coal Reburning Reaction Conditions on NO_x Reduction by Non-Catalytic Reduction of Ammonia,X701
  4. Temporal and Spatial Variation of Methane Emission from Urban Lake and Its Relationship with the Hydrology-water Quality,X524
  5. On the Study of Phoneme System and Phonetic Quality of High Vowels in Madarin,H11
  6. Multi-currency Notes Technology Research and Implementation,TP391.41
  7. Effect of Soil Erosion on Soil Quality in the Cultivated Slope Land on the Loess Plateau, China,S157.1
  8. Effects of CRZ-1 on Growth of Wheat under Salt Stress, Chlorophyllase and Yield,S512.1
  9. Cultivation and Effects of Environmental Factors on Carrying WSSV Virus of Litopenaeus Vannamei,S945
  10. Team building study of dual- qualified teachers of the vocational colleges,G715.1
  11. The Drying of Tilapia Fillet Using Supercritical Carbon Dioxide,TS254.4
  12. Astragalus and selenium on the Flammulina growth and applied research,S646.15
  13. Integrative treatment of elderly patients with hypertension TCM syndromes and quality of life,R544.1
  14. Based on SEM Quality Evaluation of Rural Compulsory Education in China,G522.3
  15. On the Classroom Disciplinary Management Strategies of Primary Schools under the Context of "Quality Education",G622.4
  16. High Quality Cultivation of Secondary Vocational School Students,G718.3
  17. Effects of Light, Temperature and Nitrogen on the Growth of Three Kinds of Aquatic Plants,Q945
  18. Effects of Shading on the Yield Index and Main Biochemical Components of Tea in Hilly Tea Plantation,S571.1
  19. Genetic Model Analysis and QTL Mapping of Agronomic and Quality Traits in Soybean,S565.1
  20. Professor Wang Qi identified the body - of Diseases - dialectical combination of academic thought and clinical experience and treatment of chronic insomnia clinical studies,R249.2
  21. The Antioxidative Efficient Component Recognition for Curcuma Longa L. Based on the Quality Control Pattern of Constituent Knock-out/Knock-in,R285

CLC: > Agricultural Sciences > Crop > Economic crops > Tobacco ( tobacco )
© 2012 www.DissertationTopic.Net  Mobile