The primary cause of continuous cropping obstacles is damage from root-knot nematodes and soil-borne diseases like root rot and blight. However, through field surveys and research in recent years, the author has identified another significant issue that contributes to these problems—plant self-toxicity. Self-toxicity occurs when plants release harmful substances during their growth that inhibit their own development. These substances are often excreted into the soil via the root system and are highly resistant to decomposition. Over time, as crops are grown continuously on the same land, these toxins accumulate, leading to weakened plant growth, reduced resistance, and lower yields. This issue is especially common in protected cultivation, such as greenhouse farming.
For example, a tomato plot that has been used for eight consecutive years can only produce 5–6 clusters of fruit under optimal conditions, with plants often dying prematurely. Similarly, strawberries grown on land that has been used for 4–5 years yield only 70–80% of what new plots produce. This phenomenon is also observed in hot peppers, eggplants, cucumbers, and watermelons. The yield loss caused by self-toxicity is comparable to that caused by pests, making it a critical challenge for farmers.
Another major issue in continuous cropping is the prevalence of root-knot nematodes. Due to the lack of effective pesticides, up to 20% of vegetable greenhouses in some regions suffer from nematode-related crop losses, with infection rates reaching 30% or higher. Pesticides such as phorate, carbofuran, and aldicarb are not only ineffective but also cause severe environmental pollution, making them unsuitable for the production of safe, green agricultural products.
Soil-borne diseases in protected areas are largely due to the repeated cultivation of similar crops over many years, such as tomatoes, peppers, cucumbers, melons, strawberries, ginger, and traditional Chinese medicinal plants. This leads to the buildup of pathogenic bacteria in the soil, along with excessive use of fertilizers and pesticides, which degrade soil quality. As a result, diseases such as root rot, blight, bacterial wilt, black stem, and clubroot become more prevalent. Crops may appear healthy at first but begin to die off during flowering and eventually fail entirely. These diseases are widespread, especially in protected farming areas, and have become a serious obstacle limiting farmers' productivity and income.
To address these long-standing challenges, local scientific institutions and farmers have conducted numerous experiments. Current solutions include chemical disinfection, high-temperature sterilization, freezing, and soil replacement. However, these methods are labor-intensive, costly, and often incomplete, offering only temporary relief. There has been no effective solution until now. After years of research, a comprehensive approach combining biological, chemical, and physical technologies has proven successful. Products like Ye Bao-Green 4 can rapidly break down autotoxic compounds, neutralize heavy metals, and eliminate residual pesticides, effectively addressing root rot, wilt, and other soil-borne diseases in crops like tomatoes, peppers, cucumbers, and melons.
The main reason ginseng and American ginseng could not be replanted was the accumulation of harmful pathogens and toxic substances in the soil. This technology integrates traditional ginseng cultivation methods with modern agricultural practices, solving the problem of continuous cropping obstacles and promoting sustainable, pollution-free ginseng farming.
Key features of this technology include:
1. Reusing old ginseng land reduces construction costs.
2. No need for frequent transplanting, supporting continuous growth.
3. Easy to supplement nutrients and remove pathogens, promoting healthy, large ginseng.
4. Upright roots increase commodity value.
5. Reduces conflicts between forest and farmland, supporting natural forest protection initiatives.
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