Cultivate all-round lack of necessary understanding of the protection facilities, think that there is a protected area, vegetables can be cultivated anytime, anywhere, blindly planted in advance or the pursuit of anti-season cultivation, often leading to cold damage, high temperature damage, etc., can not get the desired production effect, there is Even led to the protection of cultivation than the open field. Protected land can only be warmed or cooled appropriately. Generally, there are shortcomings such as relatively low light, high humidity, and serious soil salinization in protected areas. There are some varieties of protection sites, temperature and humidity management, fertilizer application, and pest control. Special requirements and laws, so cultivation is not a panacea.
The over-concentration of plants is due to the large investment in facilities, and they want to improve the planting density and other measures to achieve the goal of improving the city's output, increasing production, and improving economic efficiency. In fact, this is not correct. The water and fertilizer in the protected area are abundant, the humidity is high, and the temperature is high. The growth of the same species in the protected area is strong. When the planting density is too high, it often causes field canopy closure, poor ventilation and ventilation, and it easily induces occurrence of disease. Therefore, compared with the open field, the phototype of the same species is poor, and the density of planting should be smaller than that of exposed land.
Neglecting micronutrients Some growers often attach importance to the application of large amounts of elements, and contempt or do not supplement micronutrients at all. This is not acceptable. Protected land is a relatively closed production environment. Long-term lack of supplements of trace elements, it is easy to induce rational diseases, but easily considered to be bacterial or fungal, viral diseases, use chemical agents to no avail. Fertilization of vegetables should be based on the principles of improving soil fertility, reducing nitrate content, improving vegetable quality, and increasing yield. Mainly organic fertilizer, promote formula fertilization, do control nitrogen, phosphorus, potassium, promote the use of biological organic fertilizer, compound fertilizer, vegetable fertilizer, targeted fertilizer application. The use of nitrogen fertilizer is timely and appropriate, but no amount of fertilizer is applied, and chemical fertilizers and the like are prohibited for 20 days before harvest.
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