Dissertation > Excellent graduate degree dissertation topics show

Vegetable Residues Resource and Effect of Waste Vegetable Retun to Field at Plateau

Author: HuGuoPing
Tutor: CaoJing
School: Lanzhou University
Course: Ecology
Keywords: Quantity and nutrient resources of vegetable waste return vegetable waste tofield directly Nutrient release Nitrogen mineralization in soil Decomposing cycle Nitrogen lossin soil Yield effect
CLC: S141.4
Type: Master's thesis
Year: 2012
Downloads: 53
Quote: 0
Read: Download Dissertation


The disposal of vegetable waste in the process of vegetable planting is a problem. Our research is based on vegetable waste cycle agriculture and main object is reduce the use of fertilizer. Laboratory incubation experiment and field experiment of vegetables waste of plateau summer vegetable were conducted in Lanzhou City in order to understand the decomposition cycle of vegetable waste and nutrients change in soil and fertilizer reduction after applied vegetable waste, provide a basis theory for vegetable waste return to field. The results showed as follows:(1) Large amounts of waste leaves was produced through vegetable growing, and waste leaves not only waste resources, but also pollute the environment as which contain nitrogen, phosphorus, and other nutrients, especially potassium. Vegetable waste return field become possible, because of farmland leisure during vegetable harvested in October until early April next year.(2) The result of decomposition experiment from mid-September to mid-March show that celery decompose more rapidly than cauliflower waste. The decomposition pattern which was characterized by using an exponential regression equation fit well except for H3(R2=0.49-0.71), and predict the half of celery and cauliflower waste dry matter decomposed need31-57and6-12days. Luckily, we noticed that logarithmic equation is better than the exponential equation.(3) Comparing with CK, soil fertility increased significantly when vegetable waste is added. Soil organic matter, total nitrogen, available phosphorus and potassium were1.28to1.39times,1.20to1.46times,1.36to1.82times,2.60-1.81times higher than the CK, respectively. pH decreased significantly.The result showed that the net accumulated nitrogen mineralization in amended soil under inorganic nitrogen supply level was4-5times higher than the CK, moreover, the net accumulated N mineralization under N1level was significantly higher than under other nitrogen levels. Net accumulated nitrogen mineralization in amended soil with wasted cabbage leaves was3-5times higher than the CK, and the net accumulated nitrogen mineralization under B2treatment was significantly higher than that under Bland B3treatments. No significant interactive effect was found (.P=0.275) between the inorganic nitrogen level and the addition of wasted cabbage leaves by statistical analysis. The addition of wasted cabbage leaves influence nitrogen mineralization in amended soil was the dominated factor(Eta2=0.16), while the inorganic nitrogen supply level was the secondary (Eta2=0.07). In the early period(0-20d) of incubation the net accumulated nitrogen mineralization gradually increased under B1treatment, and then maintained a steady tendency in the later period of incubation. But nitrogen mineralization, immobilization and re-mineralization occurred in the early period of incubation (30d) and the net accumulated nitrogen mineralization increased gradually in the later period of incubation under B2and B3treatments. The result showed nitrogen mineralization mainly occurred in the first30days of incubation according to mineralization rate after wasted cabbage leaves added. In addition, during the period of incubation, a first-order kinetics equation of net accumulated nitrogen mineralization in amended soil fits well with the extension of incubation days (R2=0.62-0.89).(4) Available N in lower layer and different fields decreased and vegetable yield kept steady after applying half P(600kg-ha-1) and no K(375kg-ha-1) compare with tradition and farmyard manure reduced when incorporate vegetable waste.(5) In summary, Vegetable waste return field not only making use of waste leaves efficiently, but also increasing the soil nutrient content, moreover, that can reduce environmental pollution based on the above analysis.

Related Dissertations

  1. Release of Nutrients during the Decomposition of White Clover Combined with Ryegrass as Green Manure and Their Effetcs on Fruit Yield and Quality in Apple Orchard in Weibei Highland,S661.1
  2. Decomposition and Release Characteristics of Incorporated Rice Straw and Influence on Nitrogen Use in Rice under Different Tillage Patterns,S511
  3. Study on the Characteristics of Horse Dung Decomposition in Desert Steppe,S812
  4. Experimental Study on the Nutrient Release and Pollution Characteristics of the Sediment in Wuliangsuhai Lake,X524
  5. Summer fallow period leguminous green manure on soil properties and dryland winter wheat growth and its mechanism,S512.11
  6. Leaf Decomposition of Forest Litter in Different Environments,S714
  7. Short-term Effects of Clear-cutting, Prescribed Burning and Site Preparation on Soil Properties of Chinese Fir Plantation, and Contribution of Harvest Residues to Soil Nutrients,S791.27
  8. Study on the Function of Soil Fauna in Abies Nephrolepis Litter Decomposition in Changbai Mountains,S718.5
  9. Decompositiong and Reserves Dynamics of Leaf Litter from Pinus Tabulaeformis and Quercus Aliena Var. Acuteserrata Forest in Qinlin Mountains,S714
  10. Research on Fine Root Characteristics in Alnus Formosana Forest under Cultivated Forage Grass,S714
  11. Preparation and Characterization of Biodegradable Polymeric Membranes for Controlled-release Fertilizers,TQ440.4
  12. Leaf Litter Decomposition and N, P Dynamics of Several Urban Trees in Different Environments,S714
  13. Research and Model of New Spring Wheat Cultivars Selection and High-yield Cultivation in Gansu Ying-Da Qing Wangchuan Newly-irrigated Area,S512.12
  14. Organic Fertilizer Nutrient Releasing Rate in Different Substrates and Its Effects on Tomato Growth,S641.2
  15. Study on Physio-ecological Traits and Yield of Super Absorbent Polymers and Other Water-retaining Measures Combination on Winter Wheat,S512.1
  16. Patterns of Nutrient Release from Straws Returned to the Field and the Allelopathic Effect of Rice Straw,S141.4
  17. The Nutrient Release Characteristics of Polyolefin-Coated Controlled-Release Urea and Fertilizer Effect,S145.6
  18. Litter Decomposition, Soil Respiration and Its Response to Simulated Nitrogen Deposition in Evergreen Broad-leaved Forest, Southwest Sichuan,S714
  19. Effects of Controlled Release Compound Fertilizers on Biological Activity and Quality of Flowers,S68
  20. Preliminary Study on Characteristics of Novel Macromolecular Slow-release Fertilizer,TQ440.7

CLC: > Agricultural Sciences > Agriculture as the foundation of science > FERTILIZERS > Farm manure > Compost, compost
© 2012 www.DissertationTopic.Net  Mobile