Four challenges and countermeasures of greenhouse vegetable planting in summer
The arrival of summer, for greenhouse vegetable growers, means a series of new challenges. Under the scorching sun, the temperature in the greenhouse is higher than that outdoors, and the humidity is also larger, and these factors combine to cause no small pressure on the growth of vegetables. Therefore, it is particularly important to understand and master the main points of greenhouse planting in summer.
First, high temperature and strong light
Summer heat and intense light are a major obstacle to vegetable growth. High temperatures can cause vegetables to overgrow and fruit to fall. Therefore, effective temperature control and shading are key. Specific measures include:
1. Strengthen ventilation: When the temperature in the shed exceeds 35 ° C, the vent should be opened in time to achieve air circulation and reduce the internal temperature.
2. Shading and cooling: shading nets are set at the top of the shed to reduce direct sunlight, and cooling agents are sprayed during high temperature periods.
3. Adjust the diurnal temperature difference: at night, by putting the bottom wind, etc., to widen the diurnal temperature difference and maintain the normal growth rhythm of vegetables.
Two, heavy rain
Heavy rains in summer are also a threat to greenhouse vegetables. Heavy rainfall is easy to cause water and soil damage in the shed, which affects the health of roots. In order to prevent this problem, it should:
1. Strengthen drainage: Ensure that the drainage channels outside the shed are unimpeded to quickly divert rainwater.
2. Strengthen the shed: Strengthen the shed to prevent damage caused by heavy rain.
3. Check the weather forecast in time: Pay attention to weather information and prepare for rain in advance.
Third, the problem of harmful drugs
Under the condition of high temperature, the irritability of some pesticides on vegetables is enhanced, which is easy to cause drug damage. Therefore, special attention should be paid to:
1. Adjust the concentration: When using pesticides in summer, the concentration of the liquid medicine should be adjusted lower than the conventional concentration to reduce the stimulation of vegetables.
2. Control spraying time: Avoid spraying at high temperatures, and spray in summer is generally chosen before 9 in the morning or after 4 in the afternoon.
3. Water spraying: In case of drug damage, rinse the leaves with clean water in time, or spray the drug to alleviate the drug damage to reduce the drug damage.
Infestation of pests
Summer is the season for aphids, mites, leafhoppers, and white whiteflies, which will harm the growth of vegetables after entering the shed. Prevention and control measures include:
1. Set up a pest control net: Install a pest control net at the vent of the greenhouse to effectively block the invasion of pests.
2. Use biological control: Use yellow sticky boards to trap and kill flying insects, or use biological pesticides for control.
3. Remove weeds in time: Remove weeds outside the shed to reduce the habitat of pests.
Summer greenhouse vegetable planting needs to consider factors such as high temperature, strong light, heavy rain and pests, and reduce the adverse effects on vegetable growth through scientific management methods. Through the implementation of the above measures, optimize the growing environment of summer greenhouse vegetables, improve the yield and quality.
