Method for improving quality of foliage vegetables by utilizing short-term continuous illumination

Abstract

The invention discloses a method for improving the quality of foliage vegetables by utilizing short-term continuous illumination. The method comprises a step of continuously illuminating vegetables for 2 to 5 days before the vegetables are harvested so as to increase the accumulation of soluble sugar and vitamin C (Vc) nutrient substance inside the vegetables and reduce the content of nitrate, wherein the vegetables can be soilless cultivated or soil cultivated vegetables. The continuous illumination is that: the illumination process is continuously performed and no alternation of a light period and a dark period exists; and a mode that an artificial light source provides the continuous illumination or the natural illumination is utilized in the daytime and the artificial light source is adopted for light supplement at night can be adopted. The artificial light source is the traditional electric light source, and is preferably one or a combination of more of a high-pressure sodium lamp, a fluorescent lamp, a filament lamp, a red light-emitting diode (LED) light source and a red and blue LED combined light source. The illumination intensity in the method is not lower than 100mu mol.m<-2>.s<-1>. In the method, the simple continuous illumination is utilized to realize the short-term quality regulation and control of the foliage vegetables, change the ingredient content of vegetables sold on the market, increase the accumulation of the soluble sugar and the Vc nutrient substance which are useful to human bodies, and reduce the content of the nitrate at the same time; and the method is simple and has reliable results.

Description

technical field [0001] The invention belongs to the technical field of vegetable quality control and improvement, in particular to a short-term quality control method for leafy vegetables before harvesting, that is, a method for improving the quality of leafy vegetables by using short-term continuous light. Background technique [0002] Vegetables are one of the essential foods in people's daily diet. They can provide humans with various proteins, carbohydrates, minerals, multivitamins and various beneficial biologically active substances, which are essential for maintaining human health. However, vegetables, especially green stem and leaf vegetables, are prone to high accumulation of nitrate, a substance that poses a great potential threat to human health. According to statistics, the nitrates that humans ingest from vegetables account for more than 80% of the total nitrates ingested by humans. In order to obtain high-quality vegetables, people have been studying how to in...

AI Technical Summary

Problems solved by technology

[0004] Although the above short-term control measures have achieved good results in reducing nitrate and increasing vitamin C content, there are still some problems: (1) The yield of vegetables has decreased due to the removal or reduction of nitrogen fertilizer use. This effect is more obvious when the time is extended; (2) the above measures reduce the content of other nutrients, such as in the experiments of Dong Xiaoying and Li Shijun, the content of carbohydrates in the treated vegetables is significantly reduced; (3) the above-mentioned The control measures all need to replace the nutrient solution in the later stage of vegetable growth, which greatly increases the management difficulty and production cost; (4) the above-mentioned short-term control measures are only applicable to soilless cultivation, and in traditional soil cultivation, the above-mentioned measures are not available; ( 5) The above method has high requirements on the weather. In the absence of artificial supplementary light, the light intensity must reach a certain level in several consecutive sunny days, otherwise the nitrate content in vegetables cannot be effectively reduced.

However, most of the existing researches are based on natural light or alternating light and dark periods, and there is no report on the method of using short-term continuous light to regulate vegetable quality.

Images