Key point one: temperature

The temperature must be good. The key to temperature control and strong growth is to control the temperature.

Temperature is the key to the growth of vegetables. High temperatures, especially high night temperatures, can cause prolonged vegetable growth. Therefore, the regulation of temperature is one of the technical points for the cultivation of strong trees.

For summer vegetables, because the growth is in the high temperature period, the shed will often exceed 40 °C, affecting the normal growth of vegetables, which requires the timely control of vegetable farmers. In addition to increased ventilation, we must also pay attention to the application of sunshading and cooling agents and sunshade cooling facilities to try to increase the temperature difference between day and night to prevent the growth of vegetables. Under normal circumstances, solanaceous vegetables should be controlled in the temperature of 25 °C ~ 30 °C during the day, at night should be controlled at 15 °C ~ 16 °C; Melon vegetables should be controlled at 25 °C ~ 32 °C, night control at 15 °C ~ 18 °C .

In general, when the temperature in the greenhouse exceeds 35°C, the shade net should be installed on the roof to reduce the temperature. Pay attention to the shade net covering time from 11 am to 2 pm, and avoid full-day coverage so as not to affect the normal photosynthesis of vegetables. . When the nighttime temperature is higher than 18°C, the night ventilation should be strengthened (the venting at the front face and the air at the top) to reduce the temperature, and the temperature difference between day and night should be maintained at about 15°C. After enough work is done, if the temperature inside the shed is still high, spray water or pouring small water can be used to assist in cooling.

Key point two: Moisture

Water should be well controlled. With water to promote root, water control and disease prevention, the key point is to control water.

Soil moisture is an essential ecological factor for vegetable growth. However, if the watering is too much and the attendance is too high, the vegetables tend to prosper, which is not conducive to the cultivation of strong trees. Therefore, the amount of watering and the number of watering operations can be appropriately controlled during production, creating the most suitable soil moisture environment for vegetables, rooting down the roots, and promoting root and controlling trees with water.

In general, summer vegetables should pay attention to large water, small water, not only can meet the water needed for vegetable growth, but also have the effect of reducing the temperature of the greenhouse. However, avoid watering at high temperatures at noon, generally should be done before 10 o'clock in the morning and after 4 o'clock in the afternoon, especially for some leafy vegetables, even more so, because the main job of leafy vegetables is to keep the leaves. If you are watering near noon, the leaves will suddenly roll up in the afternoon and the edges of individual leaves will be baked and lose their merchandise.

Of course, watering should also be based on the water characteristics of different vegetables. If the transpiration of melon stalks and leaves is large, the demand for water is also large, the number of watering can be appropriately increased, and it is better to ensure that the soil moisture is 70%~80%. In addition, some vegetables are wet but afraid of drought (such as peppers). After planting the seedlings, the measures of water control and scratching can be adopted to ensure the soil moisture and control the plant growth. Do not avoid watering too much to prevent root suffocation or plant leggy. Also, it should be noted that in addition to the water for planting and easing seedlings when watering, large water can be used for watering, and the remaining watering should be filled with small water.

Key point three: nutrients

Nutrients (ie, fertilizers) must be well matched. In order to use fertilizer to improve soil and raise roots, the key point is how to use fertilizer.

Summer vegetable cultivation, high ground temperature, vegetable farmers do not use ridging and colonization, most of them are cultivated using flat stubble. Pingshuo cultivation of poor air permeability is not conducive to root growth. In order to solve this problem, biological bacterial fertilizers can be applied in the cultivation of flat stubble to fully utilize the effects of biological bacterial fertilizers to improve soil fertility and roots and roots, and cultivate strong trees to improve the resistance to disease and stress of plants.

In addition, for those plants that grow too weak, chitin can be sprayed and the biological bacterial fertilizer can be used to promote growth. Can also be sprayed foliar fertilizer, of course, can also be sprayed with a single trace element fertilizer, such as vegetable seedlings after flowering to flowering, can be sprayed with zinc leaf fertilizer, not only can prevent yellowing of the parietal leaves, but also help To enhance the plant's resistance to viral diseases. In addition, one week before the flowering of the vegetables, spraying poly-boron 1500 times was selected to promote flower bud differentiation.

Key Four: Prevention

Disease should be prevented. Set pest control nets early and spray medicines early. The key points are not in control but are in control. For summer vegetables, due to the adverse environmental conditions such as high temperature and humidity, pests and diseases are more serious, so early prevention and early treatment are needed. In general, pests invade from the air vents in the sheds. Therefore, in order to reduce the occurrence of insect pests in the shed, it is best to install insect nets at the upper and lower air outlets in the shed. Insect nets generally have a specification of about 40 meshes to prevent the intrusion of various types of pests. If it is improperly protected, insects can be infiltrated into the shed. Yellow traps can be hung in the shed, or 3% acetamiprid can be mixed 1500 times with 10% imidacloprid WP for 2000 times. The effect is good.

In addition, after the summer planting of vegetables, epidemics, viral diseases, bacterial leaf spot, etc. often occur, and can be sprayed before the occurrence of the disease. For example, epidemic disease can be controlled by 77.2% Preclosure 600 times liquid; virus disease can be controlled by 500 times virus A mixed with neuregin 300 times liquid; bacterial leaf spot can be controlled by 47% Garethon WP 600 times , can effectively control the development of the disease. In addition, in the past two years, the dead trees after colonization of pepper and cucumber are more serious, it is recommended to use the method of Precike + Jinlei + Fuxing to irrigate the roots, irrigation after 7 to 10 days for the second time, irrigation for the third time after 15 days, and good control effect. .

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