What are the precautions for crop rotation of greenhouse vegetables in winter
When changing vegetable crops in winter, many vegetable growers do not pay enough attention to some matters, and the vegetables grow poorly after planting. Therefore, several issues need attention when changing vegetable crops in winter. Let's learn about them together below.
1. Clean the garden and disinfect
Diseased leaves and diseased fruits from the previous crop all carry one or more kinds of pathogens and insect eggs to varying degrees, especially plants with gray mold. Diseased leaves and diseased fruits carry a large number of pathogen spores. As the leaves and fruits fall, the pathogen spores fall to the ground surface and spread with airflow to every corner of the greenhouse. Therefore, after pulling up the vegetables, the dead branches and fallen leaves should immediately be removed from the greenhouse, and disinfection should be done well at the same time. Chlorothalonil can be used for fumigation disinfection. When fumigating, the greenhouse must be kept sealed for two days, and then ventilated before planting. This can kill pathogenic bacteria and greatly reduce the probability of disease occurrence.
2. Improve the soil
In order to save trouble, many vegetable growers do not deep-plow, but simply hoe once, and then immediately plant the next crop of vegetables. Because the whole greenhouse is not deep-plowed, chicken manure cannot be broadcast. Many vegetable growers choose to apply chicken manure in pockets, and once undecomposed chicken manure is applied in pockets, it is very easy to cause root burn and gas damage. In addition to fumigation disinfection, vegetable growers can also apply high-efficiency, low-toxicity pesticides such as abamectin when planting the next crop. This can control nematodes within 2-3 months and protect the root system. Biological bacterial fertilizer can also be applied together with organic fertilizer, using the method of suppressing bacteria with bacteria, which can create an excellent soil environment for crop growth.
3. Promote seedling recovery
After spring vegetables are planted, because the low temperature is relatively low, the roots grow downward slowly, and stiff seedlings are very easy to form. Therefore, before planting the seedlings, they should first be hardened for 2-3 days. For beans and solanaceous vegetables, the greenhouse temperature should be controlled at 25-28 degrees during the day and 14-15 degrees at night. For cucurbit vegetables, it should be controlled at 26-30 degrees during the day and 14-16 degrees at night. After low-temperature seedling hardening and then planting, once the seedlings have adapted to the greenhouse growth environment, they recover faster.
4. Cultivate strong plants
At 4-5 days after vegetable planting, when white roots grow out in the planting holes, it indicates that the root system is growing well. In this way, the seedlings can be properly restrained, which is conducive to cultivating strong plants. When the daytime temperature is higher than 28 degrees, ventilation should begin. At first, keep the daytime temperature between 25-28 degrees and the nighttime temperature at 15-16 degrees, then gradually lower the temperature, keeping the temperature difference between 10-15 degrees. In winter, the temperature is low, vegetables grow slowly, and the demand for water is not great. During production, water can be properly controlled, which is conducive to inhibiting excessive plant growth, promoting downward root growth, and cultivating strong plants.
The above is an introduction to the precautions for crop rotation of greenhouse vegetables in winter. I hope it can help you. To learn more related knowledge, please follow us.