Glass greenhouse cultivation offers excellent growing conditions for many farmers, allowing plants to thrive in specific environments. A drawback is that they cannot receive natural rainfall, necessitating artificial irrigation. However, artificial irrigation does have certain advantages, such as precise and area-wide control. Let's take a look at the watering principles for glass greenhouses.

General Principle – Avoid Excessive Watering. During the winter and spring seasons, when temperatures are lower, the transpiration rate of plants in glass greenhouses is slower, and their water requirement is relatively reduced. Therefore, it is essential to water less frequently or at longer intervals, and opt for irrigation or misting methods whenever possible. For the first two days after watering, there is higher humidity in the glass greenhouse, and proper ventilation and air exchange are required.

Watering times should be clear. Generally, watering should be done around noon in winter, as the temperature is higher then, reducing side effects. Those who can, should opt for well water for irrigation, as it has a smaller temperature difference and plants adapt more quickly. Watering should be flexible. Here are three seven-character sentences to guide us: "On sunny days, water appropriately; on cloudy days, water less or not at all; and never water on windy or snowy days. Follow these principles, and problems are usually avoided."

Due to higher temperatures on sunny days, water vaporization is rapid, leading to potential drought. When the weather turns cloudy, temperatures drop and water vaporization decreases, so the water volume needs to be reduced and the intervals extended. It's crucial to focus on watering techniques. Inside the greenhouse, there are significant temperature differences between different sections, so the amount of water should be adjusted accordingly. In the southern part of the greenhouse and areas near heat sources like heaters, where temperatures are higher, water vaporization is also greater, so more water should be applied. Conversely, in the eastern and western sides as well as the northern part of the greenhouse, where temperatures are relatively lower and sunlight exposure is shorter, the water volume must be appropriately reduced.