In mid-November, it is the busy season for greenhouse vegetable production in Shandong Province. However, in the near future, there are more rains in the province, the atmospheric temperature outside the shed is very low, and smoggy weather often occurs, which will change the sunlight, temperature and moisture in the shed. The supply conditions affect the normal growth of vegetables. To this end, the reporter interviewed a researcher at the Institute of Vegetables, Shandong Academy of Agricultural Sciences, Song Yuanlin, and asked him to give detailed answers to the greenhouse temperature and vegetable water and fertilizer management after the winter. Controlling the right temperature is the key Song Yuanlin introduced that in this period, in order to maintain a good and steady growth of the vegetables in the shed, it is the key to regulate and maintain the appropriate temperature, followed by water and fertilizer management. "The greenhouse vegetables in this period grew rapidly. Many vegetable farmers neglected the internal temperature of the greenhouse in order to pursue production." Song Yuanlin said that after winter, the temperature inside the vegetable greenhouse should not be too high, and the temperature is too high, which may lead to various freezing damage of vegetables. . For example, the suitable temperature for growing cucumber is 30 ° C, and the suitable temperature for tomatoes is 28 ° C. Recently, the province's continuous cloudy weather and haze days increased, Song Yuanlin introduced, if the temperature is not too low, you can uncover the straw curtain. In order to improve the ground temperature, the mulch film should be covered early when there is more cloudy weather in winter, which can reduce the occurrence of low temperature freezing damage. "In winter, the temperature in the greenhouse is required to remain above 12 degrees Celsius. When the temperature is too low, warming measures can be taken." Song Yuanlin said. Song Yuanlin introduced that the weather in winter is fickle. If there is snowfall, you can cover the grass when it is snowing during the day. After the snow stops, the snow on the shed will be swept away. In order to strengthen the insulation, after the grass is covered in the afternoon, you can Cover a film. When the weather changes rapidly after continuous snowy weather, the larvae should be pulled first or one third should be opened first. At the same time, observe the changes of the seedlings and find the wilting. Immediately cover the grass stalks, and then pull them back after recovery. If the vegetables are frozen, the vegetable grower can slowly increase the temperature in the shed, and should not immediately close the shed to avoid the necrosis of vegetable tissue due to sudden rise in temperature. At the same time, the frozen fruits and stems and leaves should be cut off in time to avoid tissue mildew lesions. The ratio of NPK fertilization should be balanced Song Yuanlin introduced that in the winter greenhouse water and fertilizer management depends on the day to see the seedlings, to do not fill the water on cloudy days, cold current attacks do not water. At the same time, we must pay attention to the application of nitrogen fertilizer as much as possible, and do not choose high-nitrogen compound fertilizer. In the short-term, vegetables grow better, but lack long-term effect, and plants are prone to premature aging. In addition, high nitrogen will not only make the seedlings weak, but also May cause symptoms such as tomato umbilical rot. Fertilization should focus on the balance of nitrogen, phosphorus and potassium. Winter greenhouse vegetable harvesting period is long, and it is necessary to add nutrients while harvesting. Therefore, topdressing is also very important. Topdressing should adopt the principle of a small number of times, mainly based on nitrogen and potassium fertilizer. Nitrogen does not exceed 5 kg per acre, and the fertilizer and water are combined to achieve integration. In addition, it is necessary to add trace elements to vegetables in time, because the demand for nutrients such as calcium, magnesium and boron is relatively large, and the biological fertilizer can be applied properly in the middle and late stages of vegetable growth. The biological bacterial fertilizer contains a variety of beneficial bacteria, which have the effect of activating the soil and further improving the ground temperature. Combined with inorganic fertilizers, it can not only prevent the occurrence of fertilizer damage caused by a large amount of fertilizer, but also add soil organic matter, enhance the nutrient effect of different components, and promote root development. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone
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