With the continuous expansion of ginger planting areas and the scale of planting, ginger diseases are becoming more and more serious. Continuous cropping of ginger often causes a high incidence of stem rot, spot disease, and ginger blast. The highest can reach more than 70%, leading to reduced or no harvest.
According to soil microbial analysis, ginger has been continuously planted for more than three years, and the proportion of harmful fungi in the microbial community formed has increased, reducing the number of microbial groups that are beneficial to soil health and fertility. Cause continuous ginger cropping obstacles.
The main obstacle of the soil after continuous ginger cropping is the change of soil physical and chemical properties, especially the change of soil pH, which is not conducive to the growth of beneficial bacteria and promotes the growth of pathogenic bacteria.
The activities of catalase, invertase, and phosphatase in the soil were all at very low levels during the 3-5 years of ginger continuous cropping.
The number of Sarcodina was also higher in recent years because of the lower pH, and the number of flagellates was also very low in recent years because of the low pH. The total number of bacterial-feeding nematodes is also decreasing.
Our Attempt to Relieve Ginger Continuous Cropping
According to the field trial, adding the appropriate amount of wormcast and appropriate biocontrol bacteria can increase the pH value, organic matter content, and soil enzyme activity of ginger continuous cropping soil, especially catalase, and phosphatase. According to the control effect on the soil, the effect is the best by adding wormcast and adding trichoderma harzianum.
According to our repeated experiments, the application of wormcast & trichoderma harzianum can increase the activity of catalase, invertase, and phosphatase in the soil, with a greater increase. At the same time, increase the soil organic matter content, increase the pH, and stabilize it at about 6.5. Promote the absorption of total nitrogen by plants and increase the content of soil available phosphorus and potassium.
This promotion was more obvious in the third year of the experiment. The net photosynthetic rate was higher than that of the control group, and the fluorescence parameters were also significantly better than that of the control group, indicating that compared with the control group, the experimental group had a stronger photosynthetic capacity of ginger, indicating that the use of vermicompost & trichoderma harzianum can influence the soil ecological environment to affect the physiological functions of ginger.
The effects of wormcast & trichoderma harzianum on environmental and biological regulation are coordinated, and it has a certain regulation effect on the soil ecosystem, but this effect can only be manifested after long-term repeated use.