What are the hazards of out-of-season vegetables and fruits? What is this? Off-season vegetables and fruits?
The so-called out-of-season vegetables can usually be divided into four kinds from the source. One is the anti-season fruits and vegetables in the warm and humid areas of the vertical climate zone in mountainous areas and the tropical warm areas in winter and spring. The other is anti-season fruits and vegetables in the northern and southern hemispheres. Third, the use of plastic greenhouse facilities to protect the production of anti-season fruits and vegetables. Fourth, using storage and transportation technology to supply off-season fruits and vegetables.
Yi Zhu, an associate professor at the College of Food Science and Nutritional Engineering of China Agricultural University, said in an interview with China Science Journal? The first two are the reasons for regional differences. Under the modern rapid logistics, it is seasonal for the producing area and anti-seasonal for the consuming area. So? Natsuna in winter and winter dishes in summer? Do we have to do this? No hormones, no anti-season? . Of course, seasonal fruits and vegetables are not without plant growth regulators. Not as much as possible, but there is no need to turn pale at the smell of plant growth regulators. ?
Vegetables and fruits are the same. Eating Xia Guo in winter and winter fruits in summer is not entirely due to facility agriculture and plant growth regulators.
Yi Zhu said frankly that the high temperature and high humidity environment in the greenhouse is conducive to the growth of out-of-season fruits and vegetables, but it is also suitable for the growth of some germs and pests. Not only that, most greenhouses are the same plot, and planting the same kind of fruits and vegetables year after year violates traditional agriculture? No stubble? Planting habits have caused similar diseases and pests in the soil, which have the opportunity to breed and spread for many years.
If you don't use biological control and other safety measures to control greenhouse pests and diseases, you must use a lot of pesticides to control pests and diseases. Therefore, Yi Zhu believes that if facility agriculture is not well managed, it also has its inherent shortcomings. Therefore, it is either modern, intensive, large-scale or optimized, but it can meet the arbitrary needs of human beings, beyond the limitations of nature, anytime and anywhere.
Seasonal fruits and vegetables are low-carbon.
Of course, for consumers, under strict supervision, out-of-season fruits and vegetables on the dining table are no less unsafe than in-season fruits and vegetables, and there is no significant difference in food safety between them. Yi Zhu said that some consumers' sensitive taste buds, as well as psychological hints, will think that the fruits and vegetables produced by facility agriculture are slightly inferior in flavor and taste. In fact, in theory, when the weather is favorable, fruits and vegetables in the season will get more sunshine, accumulate more dry matter such as sugar, and be more sweet and delicious. However, with the improvement of facility agriculture technology, the quality of out-of-season fruits and vegetables is getting better and better. Can consumers eat with confidence? .
Yi Zhu pointed out that from? Think about it before eating. Is it still helpful? From the perspective of low carbon and environmental protection, the lowest carbon footprint is to choose to eat more seasonal fruits and vegetables.
Whether out-of-season fruits and vegetables can be safely eaten or planted, just like out-of-season fruits and vegetables, depends on whether the national norms are strictly observed during planting, storage and transportation. Pesticides, plant growth regulators, ripening agents and preservatives used before and after harvesting can be safely eaten as long as they are produced in strict accordance with national standards, and there is no problem of ripening the human body. Yi Zhu said humorously:? Are plant growth regulators and human hormones two sets? Language system? , mutual? Don't understand? It is impossible to put four or two kilograms into the human body. ?
Eat in the moment, and eat and cherish.
At present, scientific research has not found that plant growth regulators can play a full role in human body, that is to say, there is no experimental evidence and epidemiological data to show that children's precocious puberty is caused by out-of-season fruits. Like ethephon? You can be a mature banana, but you can't be a mature child. Yi Zhu told reporters.
The existence of out-of-season fruits makes us feel the beauty brought by modern agricultural science and technology. Although there is no need to worry about safety and the flavor and taste can be ignored, considering that the protected agriculture is not low-carbon and environmentally friendly, the groundwater in the North China Plain is almost exhausted, and the plastic film in greenhouses has a continuous large-scale white pollution to the soil. Still have to moderately control your own freewheeling. ? Yi Zhu said? Compared with out-of-season fruits and vegetables, the average carbon dioxide emission per kilogram of seasonal fruits and vegetables is reduced by 200 grams during planting, storage and transportation. Therefore, choosing seasonal fruits and vegetables is the performance of protecting the environment from me. ?
? Of course, moderate enjoyment, early adopters and gifts are all good choices. But you don't have to eat it every day. ? Yi Zhu cautioned,? Eat in the moment, and eat and cherish. ?
What are the hazards of out-of-season vegetables and fruits?
1. Anti-season vegetable development strategy document
2. What are the fruits and vegetables that clear heat and detoxify?
3. What vegetables are seasonal vegetables in September? What's good to eat in September?
4. What fruit do you eat? Fruits and vegetables with melanin removed.
5. What fruits and vegetables do you eat in autumn?
6. Compendium of Materia Medica Food, Health-care Vegetables and Fruits