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In recent years, similar to the Hunan cadmium rice event aspects of agricultural product safety accident prone, the safety of agricultural products has become the focus of attention. Hunger breeds discontentment, we all cannot do without meals. Up to the national leaders, to the ordinary people are increasingly concerned about the quality and safety of agricultural products. And many times the safety of agricultural products at the national level that the two sessions on the proposed research, stressed. Soil acidification is one of the important reasons leading to the serious soil borne diseases. The soil borne diseases cause the use of pesticides and the quality of agricultural products. According to statistics from related departments, the main vegetable planting area of 3 million mu, the soil borne diseases occurrence area 3.5 million acres around, each big city vegetable is particularly serious.
Soil borne disease refers to pathogens such as fungi, bacteria, nematodes and viruses with residues and disabled life in the soil, the optimal conditions, from the root of the crop or neck against caused by the disease. Pathogen like acid soil growth and reproduction, the most suitable for PH5.0 - 6.5. Vegetable soil transmission, the main types of diseases including: vegetable root knot nematode, cruciferous (cabbage, kale, broccoli) of clubroot and Fusarium Wilt of melon, cucumber, watermelon); Eggplant Verticillium wilt, brown streak, cotton blight, tomato early, late blight, Southern Blight, bacterial wilt, disease virus, Pepper Anthracnose, blight, rust of beans, spinach, garlic class of downy mildew.
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