Ecological Restoration Of Continuous Cropping Obstacle Of Soils

Continuous cultivation of long-term high-intensity and high-cropping index of fertilization will cause serious crop and make a great impact to soil ecosystems, also brought huge losses to agricultural production. In this research, we will use tomato as experiment plant. Four treatments(Without fertilizer, chemical fertilizer, microbial fertilizer â…  and microbe fertilizer â…¡) were carried out to evaluate the impacts of different fertilizer treatments to the soils with serious continuous cropping obstacle and without continuous cropping obstacle with ordinary tomato and ornamental tomato. This paper is aimed to clarify the mechanism and ways of ecological restoration of continuous cropping obstacle of soils.The results obtained are listed as follows:1. No matter how severe cropping obstacles and no continuous cropping soil it is, chemical fertilizer can reduce soil p H and accelerate soil acidification trend. Microbial fertilizer also can increase soil p H to a certain extent and make a tendency to reverse the acidification. Compared with chemical fertilizer, the treatment of microbial fertilizer(microbial fertilizer â…  and microbial fertilizer â…¡) can significantly improve the soil p H. In this field, microbial fertilizer â…  is better than microbial fertilizer â…¡. Microbial fertilizers make an improvement on content of the increases to the soil organic matter, total N, rapidly available P and rapidly available K. The difference between the two microbial fertilizers is not significant from this point of view.2. Fertilization from height, stem diameter, fresh weight of aerial part, dry weight of aerial part, root fresh weight and root dry weight affect the growth of plants. The chemical fertilizer has obvious advantages on the soil of continuous cropping obstacles, plant height, and stem diameter and above ground biomass(dry weight and fresh weight). It also plays better in other functions, especially in severe cropping obstacles soil. Making a different between two microbial fertilizers, microbial fertilizer â…  on stem diameter and above ground biomass has a better effect in promoting function. Microbial fertilizer â…¡ on height and below ground biomass has a better effect in the same function.3. From the perspective of different fertilizer treatments on plant root apical number, length, average diameter, total volume and total surface area and so on, fertilizer is significantly better than microbial fertilizer in no cropping obstacles soil. But microbial fertilizer â…¡ has significantly superior to microbial fertilizer â…  in serious obstacles soil. Fertilizer plants not only cannot continue to promote the increase of the above factors in serious obstacles soil, it will also has a falling with time passing. While the more obvious advantages of microbial fertilizer continues to increase with time passing in above factors. Besides, microbial fertilizer â…¡ is better than microbial fertilizer â…  in promoting function.4. In the non-continuous cropping obstacles soil, photosynthetic performance index of fertilizer(chlorophyll content, stomatal conductance, CO2 concentration intercellular, transpiration rate, net photosynthetic rate) is the highest and significantly higher than other treatments. Microbial fertilizer â…  intercellular CO2 treatment is significantly higher than that of microbial fertilizer â…¡ treatment. Stomatal conductance and transpiration rate, net photosynthetic rate indicators are photosynthetic characteristics of microbial fertilizer â…¡ treatment is significantly higher than microbial fertilizer â…  treatment in serious obstacles soil, photosynthetic characteristics of microbial fertilizer indicators are higher than chemical fertilizer in most aspects. Compared with two microbial fertilizer, the other indicators are microbial fertilizer â…  treatment is significantly higher than that of microbial fertilizer â…¡ treatment in addition to viewing tomato transpiration rate.Comparison of the same application on different soil fertilizer difference showed that continuous cropping obstacles seriously affect plant growth. Different fertilizer treatments on increasing effect of stomatal conductance, transpiration rate and net photosynthetic rate show that microbial fertilizer treatment is significantly higher than other treatments. And microbial fertilizer â…  treatment is significantly higher than microbial fertilizer â…¡ treatment.