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(2) The chemical properties of the soil are degraded. The greenhouse is continuously used as vegetable soil. Due to the large amount of chemical fertilizers, especially chemical nitrogen fertilizer, the soil is not washed by rainwater, and shallow ploughing, soil fertilization, irrigation and drainage systems are not supported, etc. Improper cultivation practices result in the accumulation of salt in the soil. And because the same vegetable root distribution and depth of the same, the same nutrient absorption, can easily lead to an increase in the consumption of certain nutrients, resulting in the lack of nutrients. Soil potassium deficiency, calcium, magnesium, and boron were found in greenhouses.
(3) Increased acidification of soil As agricultural products are not scientifically fertilized according to the laws requiring fertilization of crops, the application of organic fertilizers is reduced, and the amount of chemical nitrogen fertilizers is increased. Especially under the specific conditions of greenhouse cultivation, the acidification of the soil is serious, and the normal growth and quality of crops are affected. decline. At the same time, the application of acidic and physiological acidic fertilizers will reduce the pH of the soil, such as superphosphate, which itself contains 5% of free acid, applied to the soil, will reduce the pH value of the soil. Physiological acidic fertilizers such as ammonium chloride, potassium chloride, potassium sulfate, etc., are applied to the soil and selectively absorb ammonium (NH4+) and potassium due to vegetables, thereby replacing hydrogen on behalf of the vegetable root colloid, increasing the acidity of the soil and increasing the amount of soil for a long period of time. Applying these fertilizers often leads to soil acidification.
In addition, harmful substances secreted by the roots can also increase the obstacles of continuous cropping. For example, the continuous production of watermelon caused a serious reduction in production. In addition to the related to blight, salicylic acid secreted by the roots is also one of the reasons for the reduction of production.
Causes of Continuous Crop Obstacles in Greenhouse Vegetables
(1) The pests and diseases are aggravated. Because it is difficult to implement effective crop rotation in greenhouse vegetable plots, a large number of pests and diseases are accumulated, which may aggravate the occurrence of pests and diseases. At the same time, the relationship between soil and vegetables is relatively stable, and it is easy to produce the same pests and diseases. In particular, soil-borne diseases are even more serious. Such as verticillium wilt of eggplant, brown leaf disease, M.blight; tomato's early and late blight, blight, bacterial wilt, viral disease; pepper anthrax, virus disease; cucumber wilt disease; Chinese cabbage soft Rot, clubroot, and soil-borne pests such as nematodes and root lice.