What are the problems in fertilizing greenhouse vegetables?

Reporter: In recent years, there has been a rich food basket for urban residents. What are the advantages of using greenhouses to grow vegetables?

Experts: The use of plastic greenhouses or greenhouses to grow vegetables is characterized by the use of manual measures to change the local ecological environment, in the inappropriate season of growth, full use of light energy and heat, making it possible to produce off-season vegetables, the vegetable market is important for the annual equilibrium . It not only overcomes the difficulties of producing vegetables in the off-season, solves the problems of “residential baskets” of urban residents, but also finds a way for the farmers to become rich with science and technology.

Reporter: I heard that a lot of vegetable farmers grow vegetables and vegetables are more than a thousand yuan per mu fertilizer input. Is this reasonable?

Experts: This is definitely unreasonable. As greenhouses and greenhouses are high-input, high-yield, high-efficiency industries. As a result, farmers tend to be driven by profits, investing heavily in fertilizer at no cost. The so-called "high input" is a reasonable one, because the greenhouse vegetables due to lack of light conditions, low temperatures, heavy pests and other objective factors, have a certain impact on the growth of vegetables. Therefore, in order to promote the growth of vegetables, it is understandable that farmers should use more fertilizer than open-field cultivation of vegetables. However, on the other hand, due to the excessive amount of fertilizer, there is a certain degree of blindness, which leads to loss of nutrients, waste of resources and deterioration of the environment. This is wrong.

Reporter: Excuse me, what are the problems in fertilizing greenhouse vegetables?

Experts: According to the multi-point survey in a city in Shandong Province, there are two main problems:

First, excessive application of chemical fertilizers. Comparing with the recommended fertilization plan proposed by the local soil fertility station after soil testing, the actual chemical fertilizer usage of the greenhouse cucumber far exceeds the cucumber recommended fertilizer application amount. The average application rate was 119 kg/mu, which was more than double; P2O5164 kg/mu, which was more than 7 times higher; Potash fertilizer was basically the same. The average yield of cucumber is less than half of the target yield.

Second, the proportion of nutrients is not balanced. The imbalance of nutrient ratio is caused by the fact that the ratio of N, P and K nutrients in the fertilized materials does not meet the crop requirements and does not achieve the effect of regulating soil nutrient status. Because the input of nutrients is extremely unbalanced, the utilization rate of fertilizers is reduced, farmers' income is reduced, and environmental pollution is also caused.

Reporter: It seems that the problems with fertilizing vegetables in greenhouses are so serious that they should cause the vegetable growers to attach great importance. Will the consequences of fertilization be serious?

Experts: Due to the large blindness in greenhouse vegetable fertilization, there have been varying degrees of salt damage in greenhouses. It not only seriously affects the normal growth of vegetables, but also greatly shortens the useful life of greenhouses.

Expert Tips:

1. Excessive application of chemical fertilizers and unbalanced nutrient ratios are the main problems in fertilization of greenhouse vegetables.

2. Blind fertilization is the root cause of resource waste and environmental deterioration.

3. Greenhouse vegetable fertilization should adjust the ratio of nutrients and achieve balanced fertilization so as to achieve the goal of saving fertilizer costs and ensuring that vegetables achieve high yields, high quality, and high efficiency. (Chen Lun-Shou)

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