Vegetable farmers' attention: the spring weather is changing and the greenhouse management has to change!
The weather in spring is fickle, and only the scientific management of greenhouse vegetables can obtain better yield, quality and benefits. Therefore, the farmers, this article should be carefully read.
Temperature management
At present, the vegetable varieties in greenhouses are mainly warm vegetables and a few heat-tolerant vegetables, such as strawberries, cucumbers, tomatoes, eggplants, peppers, kidney beans, loofah, watermelons, cowpeas, etc. The suitable temperature for photosynthesis of these vegetables is 20-30 ° C, which is growing. In the early stage (initial flowering stage, initial fruiting stage), the temperature is required to be low, and the late (fruitful stage) temperature is slightly higher. Pay attention to the temperature control. The temperature during the daytime generally does not exceed 30 °C. The temperature in the greenhouse at night should be kept at 15-20 °C. When the nighttime minimum temperature is higher than 15 °C, it will be ventilated overnight. Multi-layer cover cultivation with double sheds generally ensures that the warm vegetables in the shed will not be frozen.
Ventilation and dehumidification
The temperature in the spring is gradually rising, and the greenhouse vegetables have gradually entered the rapid growth period, requiring sufficient soil moisture to meet the growth needs of vegetables. The air humidity in the greenhouse should not be too high, otherwise it will easily breed diseases. To enhance ventilation, reduce humidity, and allow as much ventilation as possible under temperature conditions. The vents are located in the shelter, otherwise it is easy to flash. When there is water shortage in the field, avoid flooding.
Appropriate topdressing
After the fruit is placed in the greenhouse, it should be properly topdressed according to the growth trend. The fertilization place should have a certain distance from the root of the plant. Generally, 10-15 kg of urea per acre and 5-10 kg of potassium sulfate should be applied immediately after fertilization, and attention should be paid to ventilation. Fertilization should not be too much, otherwise it will cause fat damage.
Prevention and control of pests and diseases
Pests and diseases mainly include gray mold and leaf mold of solanaceous fruits, and insect pests mainly include sassafras and aphids. Prevention and control of tomato and eggplant gray mold can be controlled by chlorothalonil aerosol or kelicone bacteriostatic aerosol. Early spring greenhouses try not to use liquid spray to control pests and diseases. The main method of controlling leaf mold is to pass the ventilation and dehumidification. The rainy and illuminating weather can not spray the liquid, and the bacteria can be used. Aphids can be used to control mites. To prevent and control the sassafras, spray the ketone or ketone on sunny days. The liquid should be sprayed on the front and back of the young leaves and the tender stems. It is forbidden to use high toxicity and high residual pesticides.
Regulate growth
In the early spring, the temperature is low, and the solanaceous fruit is easy to fall into the fruit, and the measures such as anti-dropping flower or dip flower are adopted to promote fruit setting. If the plant is long, it can be sprayed with b9, ketamine or paclobutrazol to inhibit growth. If the plant is not growing well, it can also be sprayed with auxin-containing foliar fertilizer to promote growth while preventing disease. Use caution when using phytohormones to prevent overuse.
Flexible Shower Hose,Shower Hose Stainless Steel,stainless steel shower hose 2m,stainless steel shower hose 1m,stainless steel shower pipe
Yuyao Gaobao Sanitary Ware Factory , https://www.gurberry.com