The Impact Of Actinomyces On Tomato Physiological Ecology And Soil Micro-Environment

With the popularity of greenhouse vegetable, continuous cropping obstacles graduallybecomes significant phenomenon, which has become one of the main factors influencighorticulture development within greenhouse. In this article, the biological control method isused to solve the problem of tomato continuous cropping obstacles. It mainly includes threeaspects of content:(1) Actinomyces A and B are used in tomato root by irrigating and mixingwith soil, which are proved to promote vegetable growth. Exploring the best actinomyces andits method of application by comparing the influence of different treatments on physiologicalecological index of tomato.(2) This experiment sets5different concentrationprocessing:0g、.5g、1.0g、1.5g、2.0g/plant. The aim is to screen the best concentration ofcotinuous cropping soil possibly by comparing the biomass of tomato plant and parts ofphysiological indexe of different treatments.(3) The continuous cropping soils of0、4、8、12are as the material of this experiment, and the aim is to explore the influence of the bestactinomyces with its best method of application on physiological ecological index and soilmicro-environment. The main results are as follows:(1) The result of screening the best method of application show that, actinomyces A andB can both promote morphological index、biomass、root activity and chlorophyll content、net photosynthetic rate. The actinomyces effect decreases with the increase of tomato growth,and the actinomyces effect in continuous cropping4-year soil shows the most remarkable.The actinomyces effect of actinomyces A by irrigating way shows the most significanteffect on biomass, and the numerical value of the fresh weight of underground part,overground part and overall plant,7.49g、61.67g、60.16g, and the effect is55.16%、28.94%、30.95%, respectively. The root activities both in seedling and flower stages show the best,which are6.25mg/(g·h)、4.65mg/(g·h) respectively.(2) The result of screening the best concentration of application show that, the trend ofsome index increases at the beginning and decreases later, which include plant biomass、chlorophyll content、net photosynthetic rate and PPO activties of leaf and root. Theactinomyces effect of different index is higher relatively within0.5g-1.0g. The best effect ofPPO activities of leaf and root is shown in the treatment of0.5g during seedling stage, with 82.25U/(g.min)、143.92U/(g.min)，and the effect is36.30%、35.16%. It shows110.91U/(g.min)、268.32U/(g.min) in the treatment of1.0g during flower stage, and the effect is36.30%、65.06%。(3)The influnce of actinomyces on continuous cropping tomato physiological ecologyand soil micro-environment shows the result as follows:a. Actinomyces can promoto the increase of biomass, leaf area, root and the plantoverground parts in non-continuous and continuous cropping tomato. The maxmum and themost significant effect are showed in continuous cropping4-year,for example,the numericalvalue of leaf length、leaf width and stem diameter is9.86cm、8.58cm、2.68mm, andactinomyces effect shows7.29%,8.88%,13.08%, and that fresh weight ratio of ground andunderground, dry and fresh weight ratio is0.21, the effect is10.53%.b. Actinomyces shows the best effect on the fruit output of plant and fruit weight incontinuous cropping4-year,2.89%, with4.98kg/plant and276.80g/fruit. However, it is not sosignificant in overall output.c. Actinomyces can promote PPO activity of leaf and root both in continuous andnon-continuous cropping tomato plant, which plays value on the ability of tomato againstchilling injure and continuous cropping obstacles in the early stage.d. Actinomyces can boost the chlorophyll content and net photosynthetic rate. The chlorophyllcontent increases with planting years, while the Pn decreases with planting years. The values of bothchilorphyll content and net photosynthetic rate show maxmun in the continuous cropping4-year, with10.78%、41.16%, respectly.e. Actinomyces can promote the structural composition of soil microbial biomass fromFungi type to Bacteria type, nitrogen converses to nitrate, and boosts the absorption of N、K, andincreases soil organic matters significantly.