Dissertation > Excellent graduate degree dissertation topics show

The Influences of Tillage and Application of Microbial Inoculants on Soil Chemical and Biological Characteristics in Rotation of Wheat and Corn

Author: LiXiaoLei
Tutor: LiuWenJuï¼›ZhangLiJuan
School: Agricultural University of Hebei
Course: Soil
Keywords: Rotation of wheat and corn straw returning microbial inoculants Soil enzymes activities Soil microbial biomass
CLC: S513;S154
Type: Master's thesis
Year: 2011
Downloads: 84
Quote: 0
Read: Download Dissertation

Abstract


Crop straw is the fourth of energy resource in the world. If the straw is burned after crops harvesting, it will produce plenty of CO2 into the atmosphere and make an environmental issue. Therefore, more research concerns the straw returning to the field and straw decomposition in soil around the world recently. However, the straw returning to the field should influence chemical and biological properties of soil, such as soil microbial biomass, soil enzyme activities, and nutrients in soil. So this study was conducted in high-yield field located in the piedmont plain of Hebei province under the conditions of straw returned to explore the influences of influences of tillage, straw returning and the application of microbial inoculants on soil microbial biomass, the activities of related soil enzymes and available nutrients in soil during the rotation of winter wheat and maize. The main results showed as follows:1. Deep tillage was more beneficial to decompose the crops straw in soil during next growing season comparing to rotary tillage (normally the depth less than 15 cm) before wheat sowing. For the deep tillage treatment, the application of biogas slurry and EM Strain had accelerated the activities of soil enzymes at each growing stages of winter wheat. Under rotary tillage, the application of biogas slurry, EM Strain and plant growth-promoting rhizo-bacteria improved the activities of cellulose which is closely related to the decomposition of straw manure.2. Compared with the application of silicate bacteria, soil microbial biomass C increased by the application of plant growth-promoting rhizo-bacteria in 0-20 cm soil layers, and soil microbial biomass N was increased by the application of plant growth-promoting rhizo-bacteria in 20-40 cm soil layers. The application of silicate bacteria combined with potassium fertilizer (KCl) decreased the levels of soil microbial biomass C and inhibited the activities of soil cellulase, which was not good for decomposition of straw in soil. Moreover, silicate bacteria had no effect on the concentrations of available K in soil. The application of plant growth-promoting rhizo-bacteria accelerated the decomposition of corn straw in soil during wheat growing period.3. There was no significant difference in microbiologic and biological soil characteristics between straw-stubble mulching and straw-crushing mulching during corn growing period. The two ways of straw returning and the application of microbial inoculants did not enhance the decomposition of straws markedly. Soil microbial biomass C & N increased in 0-20 cm soil layer when bacterium W1 applied and increased in 20-40 cm soil layer when bacterium W2 supplied in soil. Straw-stubble mulching is the better way to decompose the wheat comparing to straw-crushing mulching. Moreover, bacteria W1 and W2 both can accelerate the decomposition of straws.

Related Dissertations

  1. Study on the Simulation of Agricultural Non-point Source Pollution in Huaihe River Basin in Henan Provice,X52
  2. Effects of Three Aquatic Plants on Soil Properties and Depletion of Rhizosphorus Nitrogen and Phosphorus,S154.4
  3. Effects of Fertilization Application Rate on Crop Cultivation and Soil Organic Carbon,S147.2
  4. Effects of Salinity on Soil Microbial Activity and Soil Fertility in Cotton Field,S562
  5. Study on Effects of Straw Channel-Buried Returning in Rice-Wheat Rotation Field,S141.4
  6. Response of Soil Microbial Biomass and Nutrient to Simulated Warming and Nitrogen Application in Songnen Grassland,S812.2
  7. Effects of Tillage Measures on Soybean Field Soil Biological Activities,S154
  8. Study on Effect of Straw Returning on Alkali Meadow Soil Fertility,S158
  9. Effect of Straw Decomposition on Zinc Supply Capacity of Soil,S153
  10. The Study of Soil Microflora of Major Bamboo Grove in Sichuan,S714
  11. Study on Soil Nitrogen-fixing Bacteria of Different Vegetation in the Mountain Forests-the Arid Valley Ecotone in the Upper Reach of Minjiang River,S714
  12. Study on the Effects of Straw Returning to Soil in High-yield Rice-wheat Double Cropping System,S141.4
  13. The Characteristics of Fertility in Anthropogenic Mellowing of Three Parent Material Raw Soils in Red Soil Area under Long-Term Fertilization,S158.1
  14. The Changes of Soil Hydrolase Activities under Straws and Fertilizer,S141.4
  15. Effect of Matching Use of Straw and Fertilizer on Soil Oxidoreductase Activity,S154.2
  16. The Effect of Maize Straw Returning and Nitrogen Fertilizer Interaction on Soil C and N in Continuing Cultivated Wheat Field,S158.2
  17. Effect of Straw Returning Soil on Soil Fertility, Yield and Quality of Tobacco Leaves,S572
  18. The Research of Fertilization Technique for High Yield of Wheat in Huang Fan Qu Farmer of Henan Province,S512.1
  19. Effects of Maize and Vegetables Intercropping Patterns on Soil Character in the Vegetables Field,S63
  20. Influence of Rice Straw Returning on Growth and Production Quality of Flue-cured Tobacco,S572

CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil Biology
© 2012 www.DissertationTopic.Net  Mobile