Is hydroponic vegetables safe to eat ?
When it comes to hydroponic vegetables, people will be concerned about what the nutrient solution is? You tell him it's chemical composition. Can he say it's not a fertilizer dish? Will hydroponic vegetables be unsafe to eat! In order to cater to consumers, some nutrient solution manufacturers avoid the fact of using chemical raw materials and say that they are mineral fertilizers. Some factories even add some organic fertilizer to household chemical fertilizer to serve as organic nutrient solution. In fact, when you really understand the nutrient solution of hydroponic vegetables, this concern will naturally disappear!
Let's talk about Kopp first.
Is chemical fertilizer harmful to human body?
The reason why modern agriculture opposes the abuse of chemical fertilizer is not how harmful chemical fertilizer is to human body, but that some chemical fertilizers cause damage to soil structure and environment. Fertilizer and human perception can affect the taste of some crops at most - nutrient imbalance will lead to poor taste, but it is not harmful to human health. In fact, the safety risk caused by pathogenic bacteria and parasites in human and animal feces is much higher than that of chemical fertilizer. Many developed countries have strict restrictions on the use of human and animal feces, but do not restrict the use of chemical fertilizer. Please note: the reason why agricultural experts oppose the abuse of chemical fertilizer is mainly to consider the soil structure and environmental pollution factors, not that chemical fertilizer is harmful to health!
Fertilizer dishes are not delicious?
It's possible! The main reason is that the effective components of chemical fertilizer are high, which is easy to lead to nutrient imbalance. In particular, some farmers lack correct methods for the use of chemical fertilizer and abuse it, which will lead to the decline of taste. As long as it is used correctly, chemical fertilizer can ensure the taste quality as farm fertilizer.
What is the difference between chemical fertilizer and organic fertilizer?
The difference between chemical fertilizer and traditional farm fertilizer is a bit like the relationship between western medicine and traditional Chinese medicine. Chemical fertilizer is similar to western medicine, with exact composition, high purity and quick effect; Farmyard manure is a bit like our traditional Chinese medicine. It only knows large types, complex and general components, low purity of effective components, slow and long effect. From the perspective of plant absorption, there is no essential difference between the two. They are both effective components that absorb ionic state, but chemical fertilizer has been or can be quickly decomposed into ionic state, which is easy for plants to absorb, so it works quickly; Farm manure must be gradually decomposed into ionic co absorbed by plants through enzymes, so organic fertilizer has slow effect, but the fertilizer effect lasts for a long time. We often say that chemical fertilizer is easy to burn roots because it is too easy to absorb and has high purity. If it is excessively concentrated in the roots, it may cause root osmotic pressure disorder and damage root tissue. Farm manure can only be accumulated and fermented, resulting in excessive temperature and root burning. Generally, there will be no fertilizer damage.
Let's think about the difference between western medicine and traditional Chinese medicine. Is it a little similar? Well, let's look at the ingredients of the nutrient solution and see if it's safe or not. We take the most widely used general formula of Japanese Garden trial as an example to see what the nutrient solution is.
The raw materials used in the general formula of Japanese Garden trial are as follows:
Calcium nitrate, a commonly used quick acting calcium nitrogen compound fertilizer, has the characteristics of rapid calcium and nitrogen supplement. Its unique combination of nitrate nitrogen and 100% water-soluble calcium provides many properties and advantages that other chemical fertilizers do not have. It is one of the most valuable fertilizers on the market.
Potassium nitrate - 70% of the world's potassium nitrate is used as agricultural fertilizer. Israel and the United States have the largest output, accounting for about three quarters of the world's total. In addition to being used as fertilizer, it can also be used as chromogenic agent for meat products in China, with a maximum dosage of 0.5g/kg.
Ammonium dihydrogen phosphate - mainly used as fertilizer, fire retardant for wood, paper and fabric, as well as pharmaceutical and ruminant feed additives.
Magnesium sulfate - magnesium sulfate can be used in tanning, explosives, papermaking, porcelain, fertilizer, and oral laxative in medicine. Magnesium sulfate is used as a fertilizer in agriculture because magnesium is one of the main components of chlorophyll. It is usually used for potted plants or magnesium deficient crops, such as tomatoes, potatoes, roses, etc. Magnesium sulfate has the advantage of higher solubility than other fertilizers. Magnesium sulfate is also used as bath salt.
Chelated iron - chelated iron is widely used in medicine, children's nutritional additives and agricultural micro fertilizers.
Boric acid - used in glass, enamel, ceramics, medicine, metallurgy, leather, dyes, pesticides, fertilizers, textiles and other industries; Used as chromatographic reagent.
Manganese sulfate is an important trace element fertilizer in agriculture and a catalyst for plants to synthesize chlorophyll.
Zinc sulfate -- used as an emetic in medicine. It can be used to prevent diseases in fruit tree nursery. It is also a common fertilizer to supplement crop zinc trace element fertilizer. It can be used as base fertilizer, leaf fertilizer, etc.
The dosage of copper sulfate and ammonium molybdate is very small (0.08 g and 0.02 g per ton of nutrient solution respectively), which can be ignored in terms of safety.
From all the above raw materials, it is not difficult to see that the nutrient solution is actually widely used fertilizer, some even food seasoning and pharmaceutical raw and auxiliary materials, which are originally long-term fertilizer, and there is no safety risk. After understanding these, let's take a look at the actual safety of nutrient solution in use. Hydroponic culture, as a modern high-tech agriculture, originated from western developed countries. The United States, the Netherlands, Israel, Japan and other agricultural powers are also leaders in soilless cultivation. After more than 100 years of practice and application, it is a very mature science and technology agriculture. At present, hydroponic technology has been widely used in more than 100 countries around the world, and its safety has long been proved - in fact, the safety indicators of agricultural products in developed countries are more stringent. China began to learn to introduce hydroponic technology in the 1970s. Because of its high technical threshold and large investment in facilities, it has not been popularized on a large scale, which is by no means unsafe for hydroponic vegetables.
In the nutrient solution, fish can survive normally - the general formula of Japanese Garden trial can survive normally at normal concentration. It was also observed that frogs survive in the nutrient solution pool, indicating that the nutrient solution is actually non-toxic. In contrast, farm manure and organic fertilizer may not be able to do so. We know all the ingredients of the nutrient solution, but no one can know the soil composition - if the nutrient solution can withstand strict scrutiny according to the accurate composition analysis, but no one knows the composition of the soil, it shows that the safety risk of soil culture is actually higher than that of hydroponic culture. At least, hydroponic vegetables have no problem of heavy metal pollution in soil.
Misunderstanding about the high content of nitrate and nitrite in hydroponic vegetables - in fact, nitrate and nitrite in vegetables are two completely different substances. At present, a large number of studies show that nitrite is harmful to human body rather than nitrate. Therefore, when China revised the standard for pollution-free vegetables in 2005, The original local standards mistakenly took the nitrate limit as an index of pollution-free vegetables, and adopted the index of nitrite content. Vegetables cultivated in soil may also contain high nitrate and nitrite. According to the measured analysis results of local agricultural product quality and safety inspection and supervision centers, the nitrite content of hydroponic vegetables is only one tenth of the national limit standard.
By the way, no matter what kind of cultivation, vegetables will contain a certain amount of nitrite. The longer the vegetables are stored after picking, the more nitrite is decomposed. Eating fresh vegetables as much as possible is the most effective way to reduce nitrite - it's better to eat fresh vegetables as much as possible than haggling over the planting method - which is the safest and most reasonable way at present.
To sum up, hydroponic vegetables are actually safer than soil vegetables, so you can rest assured
We offer all-weather service and your questions of Plant Grow Lamps and LED Light Solutions to Info@superled.com.cn will be answered within 24 hours.
SuperLED Electronic Co.,Limited
Operational Address: 4/F, Yuwei factory Building C, Qinghu, Longhua, Shenzhen, China 518109
TEL: 0086-755-21031150 FAX: 0086-755-21031156
Email: sales@SuperLED.com.cn ; Info@SuperLED.com.cn