What are the precautions for crop rotation of greenhouse vegetables in winter?
When changing crops of vegetables in winter, many vegetable growers do not pay enough attention to some matters, and the vegetables grow poorly after planting. Therefore, several aspects need attention when changing crops of vegetables in winter. Let's learn about them together with the editor below.
1. Clean the garden and disinfect
Diseased leaves and diseased fruits from the previous crop 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 pathogenic spores. As the leaves and fruits fall, the pathogenic spores also fall onto the ground surface and spread with the airflow to every corner of the greenhouse. Therefore, after the vegetables are pulled up, the withered branches and fallen leaves must immediately be taken out of the greenhouse, and disinfection work must be done well at the same time. Chlorothalonil can be used for fumigation and disinfection. When fumigating, the greenhouse must be 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 only simply hoe once, and then immediately plant the next crop of vegetables. Because the whole greenhouse is not deep plowed, chicken manure cannot be spread, so many vegetable growers choose to apply chicken manure in pockets. Once undecomposed chicken manure is applied in pockets, it can easily cause root burn and gas damage. In addition to fumigation and disinfection, vegetable growers can also apply high-efficiency and 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 likely to form. Therefore, before planting the seedlings, they must 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 hardening, planting again allows the seedlings to adapt to the greenhouse growing environment, so they recover faster.
4. Cultivate strong plants
4-5 days after vegetable planting, when white roots grow out in the planting holes, it indicates that the root system is growing well. At this time, 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 temperature between 25-28 degrees during the day and 15-16 degrees at night, then gradually lower the temperature and maintain a temperature difference of 10-15 degrees. In winter, the temperature is low, vegetables grow slowly, and the water demand is not large. In 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. We hope it can help you. To learn more related knowledge, please stay tuned to us.