| In recent years, the rapid development of agriculture infrastructure, cropping widespread, continuous cropping obstacle growing problems were resulting in deterioration of soil environment in greenhouse, structural abnormalities soil microbial, decreasing the activity of soil enzyme which are seriously hampered soil structural. In this paper, the seriously increasing problems of continuous cropping, as the research objective, the dosage of vermicompost (EM1,16.67 g kg-1 soil; EM2,20 g kg-1 soil; EM3,26.67 g kg-1 soil) of pot experiments were studied, including the soil enzyme activities, tomato growth, yield and quality. The main results of this paper were as follows:1. Soil available nutrient content increased with the increasing of the dosage of vermicompost; with tomato growth period extending, soil available nutrient content and the EC decreased, soil pH and C/N increased.2. With the advance of the tomato crop growth, soil urease activity increased gradually; The trend of invertase activity was fall after rise (the full fruit period hold the lowest soil enzyme activities); Catalase and polyphenol oxidase activity showed a trend of decline after rising (the full fruit period was the highest soil enzyme activities); In all treatments dehydrogenase activity did not change to do the same, in addition to CK had been declining, other processing dehydrogenase activity was decreased before they raised (the full fruit period was the lowest soil enzyme activities). Different dosage of vermicompost (EM1, EM2, EM3) soil urease of wane period, catalase and dehydrogenase activity were the highest EM1,2.11 mg g-1 24h-1, 2.56 mg g-1 h-1 and 0.14 mg g-1 6h-1,.and With the increasing of dosage of vermicompost, soil enzyme activity decreased; The treatment of EM3 was the highest polyphenol oxidase activity,0.91 mg g-1 3h-1, and With the increasing of dosage of vermicompost, soil polyphenol oxidase activity enhanced. The treatment of EM2 was the highest invertase activity,2.45 mg g-1 24h-1, and higher than the treatment of EM1 and EM3.3. With the increasing of dosage of vermicompost, plant height, stem diameter, the content of relative chlorophyll and intercellular CO2 concentration increased, and the net photosynthetic rate, stomatal conductance and transpiration rate decreased. From April 12th for the first time on May 25th measured plant pinch point, plant height growth rate of cattle manure (CM) was 61.9% higher than vermicompost (EM2), but the stem diameter growth rate of EM2 was 18.8% higher than the CM; The content of relative chlorophyll of EM2 was significantly higher than CM (P<0.05).4. In all treatments, EM1 treament has the most of the small tomatoes (fruit diameter<5.8 cm), but the highest yield per plant. Comparing with CK, EM1 was 1.23 times of the yield. With the increasing of dosage of vermicompost the content of the number of small fruit, organic acids and soluble sugar increased, but yield of per plant, the value of the tomato (5.8 cm<Fruit diameter<6.4 cm) and sugar-acid proportions decreased. The treatment of EM2 had the highest content of VC, and was 31.95 mg 100g-1. The yield, value and sugar-acid ratio of tomato of EM2 treatment is slightly higher than the same fertilizer rate of CM.To sum up, the suitable dosage of vermicompost was 16.67-20 g kg-1 soil in this study. Vermicompost could improve soil enzyme activity and microbial structure, promote the growth of tomato, and improve significant the yield and value of tomato. |
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