The latest watering principles of vegetables in greenhouse in winter

After the beginning of winter, the temperature is getting lower and lower day by day. After watering, many vegetable farmers find that the leaves of vegetables gradually turn yellow, and some vegetables even stagnate or even die. So how to water the vegetables in the shed in winter? Let's take a look at the detailed introduction.

1. Irrigate sunny but not overcast

This sentence means watering on sunny days, but not on cloudy days. The specific watering time should be chosen according to climate change. We should strictly follow the principle of watering on sunny days, little or no watering on cloudy days, and avoid watering on rainy and snowy days. Especially in cold current and cloudy and snowy days, watering should be avoided as far as possible, so as not to cause the decrease of ground temperature and cause the death of roots, or the increase of air humidity in the shed, resulting in the occurrence and spread of diseases.

2. Water the small but not the big

The temperature is lower in winter, and the water demand of vegetables is also less, so the watering times should be less and the amount of water should be small, so it is not suitable for flooding. In general, small water is irrigated every other line, and the amount of water is only about in summer at most, which can reduce the effect of watering on low temperature and ensure the growth and development of crop roots.

3. Warm but not cold

The temperature is low in winter, if you irrigate cold water, it will cause the ground temperature to drop, which is extremely disadvantageous to the growth of crops, so the water for irrigation should be preheated in the shed now, and the water temperature had better not be lower than 12 degrees when the water temperature is close to the ground temperature. In addition, you can not directly use river water, reservoir water and pond cold water irrigation, after watering can properly close the vents, so that the temperature rises above 30 degrees for 1-3 hours.

4. drench the dark but not the bright.

Winter greenhouse vegetables should adhere to under-film dark irrigation, or under-film micro-irrigation, in order to effectively prevent ground water evaporation, reduce greenhouse air humidity and prevent the occurrence of diseases. Moreover, the use of micro-irrigation under plastic film can coordinate the water, fertilizer, air and heat needed for vegetable growth, especially in the early and middle stages, which is beneficial to promote root control and seedling control, control air humidity in the greenhouse, reduce the occurrence of diseases and insect pests, and effectively control water. Reduce fertilizer loss, improve soil structure, promote crop growth and development and improve vegetable quality.

The above is the introduction of the watering principles of vegetables in the greenhouse in winter. I hope it can help you. If you want to know more about it, please follow us.