When I went to the countryside, I often heard some vegetable farmers report that they had planted vegetables for many years. Some vegetables started to produce high yields and had good quality. After several years of continuous planting, not only the yield was reduced, but the quality was not as good as before. The benefits of growing vegetables were even. To reduce, they feel very confused.
After investigation, the author believes that the above reasons, in addition to the factors of vegetable varieties, are mainly caused by adverse changes in soil texture. First, the long-term application of chemical fertilizers, soil consolidation, poor permeability; Second, partial application of a chemical fertilizer, resulting in some vegetables lack of symptoms; Third, some farmers blindly increase the amount of fertilizer, the concentration of soil solution Increase, often reverse osmosis phenomenon appears in vegetables, growth and development are inhibited; Fourth, after long-term application of chemical fertilizers, the soil pH value is getting lower and lower, the degree of acidification increased, the vegetable's underground reproductive environment deteriorated.
Some of the above-mentioned problems with soil properties have become more pronounced when plastic films are used to cover greenhouses to produce vegetables. According to the determination, the content of nitric acid in the protected soil is more than five times higher than that of vegetable cultivation in fields; the concentration of salt is more than four times higher than that of Daejeon vegetable land.
In order to enable the normal growth and development of vegetables, comprehensive measures must be taken to improve the ecological environment of the soil and create conditions for increasing the production of vegetables.
Turn the soil deeper and reduce the amount of salt. According to the measurement of multiple layers of soil nutrients, the salts accumulate in the soil surface within 5 cm of the soil, but less accumulated in the soil below 25 cm. Therefore, after harvesting each vegetable, it is necessary to deepen the soil to reduce the salt content in the soil layer.
Optimize fertilization and improve soil. It is necessary to use as much as possible the organic fertilizers produced by farmers, or the application of bio-organic compound fertilizers or a variety of high-energy bio-organic fertilizers. To balance fertilization, reduce nitrogen fertilizers and increase phosphorus and potassium fertilizers. For vegetable plots with high levels of nitrogen fertilizers, try growing corn in the summer season to reduce the soil nitrogen content. Bo fruit and vegetable farmers new on-line, opening of the new domain name: guoshu.aweb.com.cn, send your message, product pricing, send text messages to 01089888119 (PHS) Forum of fruits and vegetables QQ: Zhang Yuhong Source: Hunan Science and Technology News
Appropriate top dressing, a small number of times. The pursuit of fertilizing materials should be to eat fewer meals, and to promote the top dressing, both to delay the release of fertilizer, but also reduce the pollution of the environment, but also to overcome the obstacles.
Large water irrigation, salt and salt. For the old vegetable fields planted for many years, in order to reduce the salt concentration, the combination of drought resistance should be applied every year, and the salt washing method should be adopted for the Dashuigou irrigation method, which can effectively reduce the salt concentration in the soil solution, but it is necessary to achieve rapid irrigation and rush. The ploughing has been removed.
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