In summer, it is characterized by high temperature, long illumination time, and high light intensity, which mainly include pests, virus diseases, and high-temperature obstacles. Difficult to grow vegetables, premature and premature vegetables, short vegetables, and deformed vegetables are the key factors affecting the yield of summer vegetables. Therefore, the key to high-yielding and stable production of summer vegetables is to control the temperature. In the summer, various measures must be taken to reduce the temperature. Only in this way can the high yield and stability of summer vegetables be ensured.
Hold up a shade: use sunshade nets
Reasonable selection of screen type sunshade network models, there are different specifications, different colors of shade net, shading rate and cooling effect are different, different types of vegetables, the requirements of light intensity are also different. Therefore, a suitable shade net should be selected according to the type of vegetables and the light intensity during the period of coverage.
When science covers the use of shade nets to cover shade in the summer, it is not appropriate to cover the entire shed. Generally, the shade net is not covered at the side of the shed of 1 to 1.5 meters in order to facilitate ventilation and prevent rotting. The shade covering on the floating surface is generally restricted to the vegetables after germination and before germination, and they should be erected in time after emergence and used as sheds. Coverage; When the cover is covered with a floating surface, the width of the shade net should be left with sufficient space. After the cover is covered with a nylon rope, the shade net is tightened and firmly clamped around to prevent it from being blown off by the wind.
Strengthen management The main purpose of the use of shade nets in summer is to shave and cool down, with shading as the main purpose. Uncovering the shade nets requires a flexible grasp of the light intensity and temperature requirements according to the weather conditions and different growth periods of different types of vegetables. Generally sunny cover, cloudy exposing; morning cover, evening exposing; pre-covered, late growth exposing.
Wash a "cooling bath": spray humidification and cooling
Although the shading measures can be cooled, they often cause weak light in the shed, weak seedlings, and reduced output. Therefore, the shading time should not be too long, and the shading rate should not be too high. The high incidence of viral diseases in summer sheds is also a key factor affecting the growth of vegetables. Viral diseases are prone to occur at high temperatures and droughts, and are less likely to occur at high temperatures and high humidity. Appropriate water spray has obvious effects on improving the humidity in the greenhouse, lowering the temperature, and reducing the incidence of viral diseases.
There are many facilities on the market that can achieve water spray cooling, and vegetable growers can choose their own installation. First, the professional atomizing water jet head, its humidification and cooling effect is good, but the cost is higher; Second, the mobile wet curtain fan system, easy installation and use, can quickly humidification and cooling, the price is also higher. If there are no special facilities, ordinary sprinkler channels can also be used, and the water can be sprayed properly after being lifted.
Supplementary nutrition feast: top dressing is the key
In summer, the ground temperature is high, and the vegetable growers use general compound fertilizers. The amount of the compound fertilizers is large, and the root weight and nutrients are not fully absorbed. In fact, the vegetables that grow under the shelves grow fast and have high yields, and they need to be supplemented with high-quality water-soluble fertilizers.
In the late growth stage of vegetables, high nitrogen and potassium fertilizers can be applied along with water to promote the growth of plants and fruits, and full-water-soluble fertilizer beacons, Haolipu and Fangrun can also be used to flush water. Foliar sprayed with foliar fertilizer containing boron, calcium and other trace elements, such as borax 600 times or 1500 times the speed of boron and 350 times mixed calcium nitrate, to a certain extent, can play a role in the preservation of fruit.
It should be noted that the use of chlorine fertilizers should be avoided because chloride ions can reduce the starch and sugar content of vegetables, which can lead to deterioration of the quality of the vegetables, a decrease in the yield, and residue in the soil, and can easily cause decalcification of the soil and cause hardening. At the same time, it is not possible to apply fertilizers containing sulfate ions, which are sulfate ions that are decomposed in the soil and are not easily absorbed by vegetables and remain in the soil, affecting the growth of vegetables.
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