After entering the summer, factors such as high temperature, strong light, and multiple pests and diseases have become the limiting factors for the growth of greenhouse vegetables. Practice has shown that during the high temperature summer season, vegetables in greenhouses should be mainly cooled, and various measures should be taken to prevent vegetables from suffering high temperatures. At the same time, in terms of management, we must not forget whether it is water control, leaf sparing, or pest control. All should be managed scientifically to avoid the "injury" of shed vegetables caused by human factors. Therefore, the summer shed vegetables "three should three avoid" to ensure safe and healthy growth.

Do a good job of "Sanyi"

In order to avoid high-temperature obstacles in vegetables in sheds, it is advisable for airy vegetable growers to open the upper and lower air outlets of the greenhouses so that the cold air outside the sheds can enter the sheds and form convection with the hot air inside the sheds. Accelerate the discharge of hot air, which is conducive to the reduction of temperature in the shed. It is necessary to remind the vegetable farmers that when the air is released, a windshield film should be installed below the air outlet to prevent the cold air from directly blowing onto the fruit surface of the vegetables, resulting in the appearance of rind and cracks in the fruits.

The Yishanet vegetable growers should put down the shade net when the temperature in the morning shed is close to the maximum temperature suitable for vegetable growth. When the temperature in the afternoon shed is lower than the maximum temperature for the growth of the appropriate vegetables, the shade net can be rolled up, but be careful. When the shade net is put down, it cannot block the air outlet. In the purchase of shade nets, farmers can buy an opacity rate of about 60%, because this shading network can not only play a role in shading and cooling, prevent sunburn fruit, but also allow some of the light to reach the interior of the greenhouse, is conducive to Improvement of photosynthesis in vegetable leaves.

Should be sprayed at noon in the summer, because the greenhouse temperature is high, the leaf evaporation is large, the water absorbed by the root can not meet the needs of vegetable transpiration, and the tomato leaves appear to roll up. The vegetable growers can install micro-spray spray in the shed to reduce the temperature of the shed. This can also increase the air humidity in the shed, prevent the stigma from drying, promote pollination, and prevent vegetables from falling.

Pay attention to "three bogey", the growth of shed vegetables "healthy"

Avoid excessive control of water Some vegetable farmers do not water for more than 20 days, so that high temperature and drought before and after noon, plant wilting phenomenon due to physiological water shortage, this is not conducive to the normal growth of vegetables, but also easily affected by soil drought The absorption of trace elements in plants, such as the umbilical rot caused by calcium deficiency, can also cause the occurrence of viral diseases. It is recommended that vegetable growers adopt a small water pouring method to ensure the normal growth of vegetables. The time and number of watering can be determined according to the dry and wet conditions of the soil in the shed and the weather conditions, and the fertilizer can be used once every other day.

Avoid over-leafing and cultivating vegetable crops must be moderate when carrying out defoliation. Follow the principle that the upper leaves of fruits are “not squeezed” and the lower leaves of fruits are “small and fine”, so as to ensure the normal growth of fruits. Photosynthetic leaves, and secondly, the upper leaves of the fruit can be shaded by fruits, so as to avoid sunburn due to excessive light extraction caused by direct light extraction, and to reduce fruit quality.

Bogey at the top of the wind, no insect net, such as whitefly, locust and other insects with migratory habits began to move to the shed, especially in the greenhouse adjacent to the wheat field, more vulnerable to pest invasion. Some vegetable farmers are only accustomed to installing insect nets on the front face of the shed or on both sides of the arch shed. However, insect nets are not provided in time at the top outlet to provide convenience for the invasion of pests. This situation is very conducive to the transmission of poisonous pests (such as powderè™±) Transmission of viral diseases may also result in the occurrence of coal pollution or fruit fleas (grazing on horses) as a result of large numbers of aphids and thrips, reducing the yield and quality of vegetables. Therefore, it is necessary to set up an insect screen at the top outlet.

Links: How Rainfall Protects Your Shed

First, dig the drains ahead of time to prevent rainwater from pouring back and repairing the three walls. During the construction of the greenhouse, a certain distance shall be set between the shed and the shed, usually 4 to 5 meters. A drainage ditch with the same length as the greenhouse may be dug in front of the shed, which is about half a meter wide and about 30 centimeters deep. So that the water left on the surface of the greenhouse can be removed at any time to prevent excessive water from flowing into the shed. Drainage and drainage should be planned in advance so that the distribution of mesh ditch can be formed in the sheltered area to ensure that the accumulated water can be discharged in time when encountering heavy rainfall.

Second, once a canopy occurs, it must be dealt with urgently. In the shortest possible time, every effort should be made to remove stagnant water, so as to avoid accumulation of large amount of rainwater that cannot be infiltrated in the planting line and lead to the roots of vegetables. After rooting, roots have poor resistance and are easily infested by rain and harmful bacteria in the soil. After draining the accumulated water, when the shed soil is dry and wet, it is timely scratched to increase the air permeability of the soil and prompt the root system of the vegetable to resume normal growth as soon as possible. The depth of scratching is determined according to the growth of vegetable roots. If the newly planted vegetables are submerged in rain, the roots will not be expanded in large areas and the ploughing can be deeper. If the root system at seedling stage has been expanded, the depth of ploughing can be controlled. About 3 cm, and do not rely on the plants too close. At the same time, it is necessary to promptly use medicine to root. When the soil moisture is suitable, use 30% of Hymex Agent 1000 times solution or 50% of Chlorobromoisocyanurate 1000 times solution to irrigate the roots. When the roots are filled, a suitable amount of rooting agent or chitin can be used to promote root repair. And regeneration.

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