A fertilization method for alleviating secondary salinization of facility soil

Abstract

The invention discloses a fertilizing method for relieving secondary salinization of greenhouse soil. The fertilizing method comprises a technology of replacing chemical fertilizer with low-salt organic fertilizer and a technology of balanced application of water-soluble fertilizer, and specifically comprises the following steps: applying 800-1,000 kg of low-salt organic fertilizer and 10-15 kg ofurea to each mu, 6-8 days before crop transplantation; dressing 5-7 kg of high-nitrogen water-soluble fertilizer (22-12-16) on each mu in the middle stage of crop growth, and dressing 10-13 kg of high-potassium water-soluble fertilizer (19-6-25) on each mu in the later stage of crop growth, wherein the dressing is performed in a drip irrigation way. According to the method disclosed by the invention, by applying low-salt organic fertilizer instead of chemical fertilizer to the greenhouse soil, the application of salt in the organic fertilizer can be reduced, and secondary salinization of thesoil caused by long-term application of organic fertilizer is avoided; meanwhile, by coupling the applying technology of low-salt organic fertilizer with the balanced application technology of special water-soluble fertilizer, the yield can be increased by 0.2-45% while reducing the application of chemical fertilizer by 30-60%, and excessive accumulation of quick-acting nutrients in the soil is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of soil nutrient management, in particular to a fertilization technology for alleviating secondary salinization of soil under the condition of balanced application of low-salt organic fertilizer and special water-soluble fertilizer for vegetables. [0002] technical background [0003] During the planting of protected vegetables in our country, the phenomenon of unreasonable fertilization and excessive fertilization is serious. Studies have shown that the content of available nutrients (nitrogen and phosphorus) in vegetable fields in my country far exceeds the environmental threshold of soil available nutrients, which is several times or even dozens of times that of surrounding farmlands, and there is a high risk of nutrient leaching. Therefore, when the amount of available nutrients in the soil is greater than the amount absorbed by plants, the excess nutrients will accumulate in the soil. When the amount ex...

AI Technical Summary

Problems solved by technology

[0006] In order to reduce the use of chemical fertilizers in protected vegetable cultivation, my country vigorously promotes the technology of increasing the application of organic fertilizers to replace chemical fertilizers. However, since most organic fertilizers use livestock and poultry manure as raw materials, and most of the livestock and poultry manure has a high salt content, it is bound to be damaged if it is used in large quantities for a long time. Exacerbate the occurrence of secondary salinization of facility soil

If the soluble salt content is reduced only by slowing down the accumulation of soil salt to the soil surface or by increasing the adsorption of soluble salt by the soil, this problem cannot be solved fundamentally.

Applying low-salt organic fertilizer while reducing chemical fertilizer application can reduce the introduction of salt from the source. However, there is no report on the application of low-salt organic fertilizer and its supporting chemical fertilizer application technology.

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