Doing moisture control of greenhouse vegetables
The air humidity in greenhouses and greenhouses is generally high. Especially when it is not ventilated in winter, it is usually higher than 80%-90% and even up to 100% at night. Irrigation is the main reason affecting the air humidity. The use of ditch and floor Water Irrigation in greenhouses and greenhouses will inevitably increase the humidity of the air. This will not only cause physiological disorders of vegetables, but also cause diseases and pests.
Different kinds of vegetables in greenhouses and greenhouses have different requirements for air humidity. For example, cucumbers and celery can generally tolerate about 90% of the air humidity; tomatoes, peppers, zucchini, and beans are about 70%; and watermelons, melons, etc. generally only 50% is enough. The reduction of air humidity mainly uses ventilation, heating, and control of irrigation. It is best to use drip irrigation technology to increase air humidity.
Greenhouses and greenhouses are all in a semi-closed or fully enclosed environment. The air flow is stable, and the precipitation supplements the soil moisture. Therefore, when the soil moisture is insufficient, it can only be compensated by rising water or irrigation from the deep capillary.
Vegetables require more water than other crops and are sensitive to water shortages. However, different types of water requirements for their different fertility periods are also different. The seedling period generally requires strict soil moisture. Such as cucumber, soil moisture during seedling period, easy to grow long; too dry, easy to become aging seedlings. Fruit and vegetable from the colonization to flowering results require a slightly lower soil moisture in order to avoid stems and leaves. However, in the flowering or harvesting period, soil moisture is insufficient, which will result in flowering and abnormal fruit. Therefore, during the flowering, fruiting and harvesting periods, the soil moisture should be appropriate and uniform, and when wet and dry, the quality and grade of the vegetables will be reduced. If the cucumber is blooming, the water supply is not timely, it will pollinate badly. Afterwards, although it complements the soil moisture, it is still easy to produce sharp-edged melons. If the fruit is lack of water in the early stage of development, there will be sufficient water in the middle period and water shortage in the later period. .
Changes in soil moisture in greenhouses and greenhouses not only affect the environment's temperature and air humidity, but also affect its ventilation, nutrients, and heat conditions. Therefore, regulating the soil moisture status in greenhouses and greenhouses is the key to ensuring that their environment is conducive to the growth and development of vegetables. The main technical measures taken are irrigation and drainage, which should be based on the different types of vegetables, the water requirement characteristics of different growth periods, and greenhouses. The environmental conditions in the greenhouse, etc. determine the irrigation, drainage and irrigation and drainage time. Advanced drip irrigation technology in greenhouses and greenhouses can ensure accurate irrigation levels.
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