Greenhouse vegetables should pay attention in the spring when the weather is changeable

    The weather in spring is relatively changeable, with alternating hot and cold. Therefore, the management of vegetables in spring is not in place, and various problems often occur. In spring, disastrous weather such as low temperature, strong wind, continuous cloudy days, and heavy snow often occurs, which causes great damage to the growth and development of vegetables. Remind vegetable farmers to keep abreast of weather changes at this stage and take preventive measures as soon as possible to avoid or reduce the hazards of disastrous weather.

    It is common to have continuous cloudy days, the temperature in the greenhouse is low, in order to keep warm, the greenhouse is closed for a long time without paying attention to ventilation, the humidity in the greenhouse is high, the amount of leaf transpiration is small, the root activity of the plant is weakened, and the absorption function is reduced. If the weather suddenly turns clear and the shed is raised too early, the temperature in the shed suddenly rises, the transpiration of the leaves increases, and the water absorbed by the root system cannot meet the transpiration needs of the leaves, resulting in wilting. At the same time, the amount of air released is large, and the nutrient transport functions of the aboveground and underground parts are not coordinated. The nutrients absorbed by the root system cannot be supplied to the leaves in time, resulting in starvation of the leaves. This is exactly why plants wilt.

    Spring vegetables are really a good time to fertilize, but if the use of under-decomposed organic fertilizer will cause the vegetables to burn the roots and smoke the seedlings, this may also occur when a large amount of semi-decomposed or mostly half-decomposed organic fertilizer is used. If the amount of organic fertilizer that is not fully decomposed is large, and the ploughing is shallow, a large amount of manure is concentrated on the shallow surface, and the decomposing process is accelerated under the conditions of good ventilation and suitable environment, which will lead to burning roots and smoked seedlings.

   Spring is generally a time of high yield of overwintering vegetables, the water demand is large, and the temperature in spring is unstable. If the water is too large in low temperature weather, because the flood irrigation can significantly reduce the ground temperature, hinder the absorption of nutrients by the root system, affect its normal growth and development, and also It is easy to increase the air humidity in the greenhouse, and humidity is an important factor that induces a variety of diseases. Therefore, it should be watered in the morning on a sunny day.

    In addition, the types of vegetable diseases and insect pests are increasing day by day. In order to improve the preventive effect, growers generally add many kinds of pesticides, such as different fungi, bacteria, viruses, pest control agents, plus foliar fertilizers, regulators, etc., which increase the occurrence of pesticide damage. probability. Therefore, my suggestion is to give priority to prevention and use symptomatic drugs, and do not     spray drugs blindly, which has already caused phytotoxicity.

    Fertilization is an important way to promote the rapid growth of vegetables, so scientific fertilization is also required to increase the yield of vegetables in greenhouses. In the process of vegetable growth, the nutrients contained in the soil are often difficult to meet the growth needs of vegetables. Therefore, in the process of vegetable growth, growers must select appropriate fertilizers for fertilization according to their specific growth conditions. provide sufficient nutrients for growth.

    In the process of growing vegetables in greenhouses, the problem of pests and diseases is also an important problem affecting their growth and yield. Therefore, growers must do a good job in the prevention and control of pests and diseases in the process of planting, and strengthen the prevention and control of pests and diseases in the later stage. For the diseases and insect pests that are prone to occur, do a good job in the corresponding prevention and control work, and effectively combine physical control, chemical control and biological control measures. When choosing chemical agents, try to choose agents that are less harmful to vegetables to prevent them from affecting the quality of vegetables. make an impact.