Many growers think that winter greenhouse crops grow slowly and consume less water, so they can use less or no watering. In fact, this statement is wrong, not only watering the greenhouse in winter, but also watering. Many growers did not master the correct method and found that the leaves of the crop turned yellow and the roots were rotten after watering. So what are the important points to pay attention to in winter greenhouse watering? Let's take a look together.
1. Pay attention to weather effects
Be sure to watch the weather forecast before watering, and try to choose watering on sunny days. At the same time, it is necessary to avoid watering on rainy days, because watering on rainy days easily causes the humidity in the shed to increase, the ground temperature to decrease, and diseases to occur frequently. It is even more necessary to pay attention to in the winter season. In addition, it is not suitable for watering in the first two days after a cloudy day.
2. Pay attention to soil moisture
It depends on the soil moisture. If watering in the greenhouse when the soil is not dry, not only is it not conducive to raising the ground temperature, but also easily leads to poor soil air permeability, resulting in hypoxia of the root system, resulting in yellow roots.
3. Pay attention to temperature
Before watering, you can put the water in the greenhouse and preheat it in advance. It is best to control the water temperature above 12 ° C. You cannot directly take out the water from the river or reservoir and directly irrigate the water. The temperature in the shed is stable for one to three hours.
4. Pay attention to the amount of watering
In winter, watering of the sheds generally follows the principle of no shortage, no watering, and dry and not wet to prevent excessive watering and frequent flooding. And the number of times must be controlled. Generally, it is just to pour small water across a row. The total amount of water can be controlled in summer, which can effectively control the low temperature changes caused by watering.
5, pay attention to watering methods
The best method is to use sub-membrane dark irrigation or micro-irrigation. This can prevent the ground water from evaporating, reduce humidity, and prevent the occurrence of diseases and insect pests. In addition, micro-irrigation can better control the amount of water and reduce fertilizer loss, thereby improving soil, promoting growth and increasing yield.
The above are the important points about watering the greenhouse in winter. In general, there are still many points to pay attention to, which can be determined according to the growing situation of the crops. Of course, the management after watering must also be actively implemented to ensure that the crops can survive the winter safely.
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