Method for decreasing nitrate salts content of vegetable in greenhouse

Abstract

The invention discloses a method to reduce the nitrate content in greenhouse vegetables. In the entire cultivation period of greenhouse vegetables, the agricultural organic waste fermentation method is utilized for the greenhouse carbon dioxide fertilization to maintain the CO2 concentration within the greenhouse from 750 to 850 u l / L. Or from one week before the harvesting of the greenhouse vegetables until the time of harvesting, the agricultural organic waste fermentation method is utilized for the greenhouse carbon dioxide fertilization in short term to maintain the CO2 concentration within the greenhouse from 750 to 850 u l / L. Or from one week before the harvesting of the greenhouse vegetables until the time of harvesting, the chemical reaction method is adopted for the greenhouse carbon dioxide fertilization in short term to maintain the CO2 concentration within the greenhouse from 950 to 1050 u l / L. By the use of the method of the invention, the nitrate content in vegetables can be quickly and effectively reduced.

Description

technical field [0001] The invention relates to a method for reducing the nitrate content of vegetables in greenhouses; in particular, it relates to a method for reducing the nitrate content in vegetables by using a carbon dioxide fertilization method. Background technique [0002] Early research has shown that consuming foods high in nitrates can increase people's odds of developing diseases such as stomach cancer and methemoglobinemia. Therefore, the nitrate content in food has always been a matter of great concern to people. Vegetables are the main source of nitrate intake by the human body, and its supply rate is as high as 30%-90%. Therefore, the level of nitrate content is regarded as an important indicator of vegetable quality. At present, the irrational application of agricultural chemical fertilizers has made the high nitrate content in vegetables has become a common phenomenon. Especially under the conditions of greenhouse cultivation, farmers often apply excessi...

AI Technical Summary

Problems solved by technology

At present, the unreasonable application of agricultural chemical fertilizers has made the high nitrate content in vegetables has become a common phenomenon.

Especially under the conditions of greenhouse cultivation, in order to pursue economic benefits, farmers often apply high amounts of chemical nitrogen fertilizers. In addition, there is no natural rainfall to wash under the conditions of greenhouses, resulting in the accumulation of a large amount of nitrate nitrogen in the soil, resulting in serious excess of nitrate in greenhouse vegetables.

At present, the method of reducing vegetable nitrate is mainly through the application of nitrification inhibitors and the selection of low-accumulation varieties of nitrate. The former is because most vegetables are nitrification-loving plants, and nitrification inhibition will affect the growth of vegetables, and the inhibition time of nitrification inhibitors is limited. Therefore, the effect of reducing vegetable nitrate is often unsatisfactory; and the latter variety takes a long time to breed, and low-accumulation varieties often have contradictions such as low yield or other poor quality, which affects its practical application.