What are the spring watering methods for greenhouse tomatoes?
In recent years, with the rise of greenhouse vegetable planting patterns, more and more vegetables have entered the greenhouse, and tomatoes have naturally been no exception. Tomatoes have a relatively high water demand during their growth process, so watering must be paid special attention to when growing tomatoes in greenhouses. So how should greenhouse tomatoes be watered in spring? Follow the editor and take a look.
1. Water according to the growth stage
During the germination stage, tomatoes require a relative soil humidity of about 80%, because the seeds need to absorb a large amount of water during germination. During the seedling stage, the relative soil humidity should be about 60%. At this time, water should be controlled, which is beneficial for well-developed root growth. However, if it is too dry, it will also affect flower bud differentiation. Generally, watering is controlled after transplanting, but it should not be excessive, and the minimum should not be lower than 60%. Generally speaking, tomatoes are watered while being transplanted, then watered again 3-5 days after transplanting to help the seedlings recover, and then watered once more until the fruit reaches the size of an egg yolk. As the plant grows and develops, if there are many fruits and ventilation increases, transpiration will also increase. At this time, humidity should be controlled at about 75-80%, and the amount and frequency of watering should be increased.
2. Water according to the cropping season
For greenhouse tomatoes cultivated in early spring, they should be watered promptly after fruit set to meet their water needs during that period. For overwintering tomatoes in winter-warm greenhouses, generally sufficient transplanting water is applied in October, followed by timely intertillage and hoeing to preserve soil moisture. Until fruit set, no watering is needed unless there are special circumstances. Watering should mainly be light to avoid a large drop in soil temperature. After fruit set, water promptly to meet the fruit's water needs.
3. Water according to growth condition
When the plant's leaves are dark green and glossy, and the heart leaves are spreading, this is a sign of uniform and suitable growth; if the heart leaves are wrinkled and do not spread, the leaf color is deep green, and there is slight leaf drooping on sunny days, then it is a sign of water shortage and timely watering is needed. If the heart leaves are excessively spread, the leaves are large and thin, and there is too much guttation on the leaf surface, it is a sign of excessive water, and water should be controlled to prevent excessive vegetative growth.
4. Watering time
Watering time should also be particular. During the growth stage, watering should be chosen on a sunny morning, and after watering, the greenhouse should be ventilated to remove moisture. It is not suitable to water in the afternoon, in the evening, or on rainy days. Watering in the afternoon and evening creates high humidity inside the greenhouse, which can easily cause pests and diseases to breed. Rainy days are already humid, and if watering continues, it will cause waterlogging damage. Even more so, do not water at noon. The temperature at noon is high, and watering will cause drastic changes in soil temperature, affecting the physiological functions of the root system. In other seasons, watering should be chosen in the afternoon, which can effectively lower the soil temperature.
The above is an introduction to spring watering methods for greenhouse tomatoes. I hope it can help you. If you want to learn more related knowledge, please follow us.