What are the precautions for fertilizing greenhouse vegetables in winter
Greenhouse technology makes it possible to grow vegetables out of season, so that we can eat fresh vegetables even in the cold winter, and when growing greenhouse vegetables in winter, fertilization is an important task. Many farmers often fertilize improperly, causing soil compaction, root rot, plant wilting and other problems, which seriously affect the returns from the plants. So how should greenhouse vegetables be fertilized in winter? Let's learn about it together.
1. Combine organic fertilizer with inorganic fertilizer
Many farmers apply fertilizer mainly in the form of chemical fertilizers, which easily lowers the soil temperature. Moreover, chemical fertilizers are mostly nitrogen fertilizers such as ammonium nitrate and urea, which can make vegetables grow well in the short term but lack long-term effects, and the plants are very prone to premature aging. Some also apply mainly cake fertilizer and diammonium phosphate, but the results are often relatively poor, because cake fertilizer needs a period of fermentation before its fertilizer effect is released, and it often misses the peak period of vegetable nutrient demand. Therefore, it is recommended to combine organic fertilizer with inorganic fertilizer, so as to meet the fertilizer needs of vegetables at different growth stages.
2. Combine topdressing with flushing fertilization
When choosing fertilizers, it is recommended to choose multi-element compound fertilizer as the main type and adopt a method that combines topdressing with flushing fertilization. In this way, on the one hand, it can solve the fertilizer demand of roots in the surface soil layer, and on the other hand, it can also activate the soil layer, increase the extension area of the root system, and supplement the nutrients the plants need.
3. Combine biological fertilizer with chemical fertilizer
Biological fertilizer contains more than ten kinds of beneficial bacteria and has the effect of activating soil and regulating nutrients. When used together with chemical fertilizer, it can effectively reduce fertilizer damage, increase the content of soil organic matter, and promote root development. It is one of the best fertilizers for achieving balanced fertilization of greenhouse vegetables. In winter, both the air temperature and soil temperature are relatively low. Generally, after compound fertilizer dissolves, it will further lower the water temperature, and after flushing application it will further lower the soil temperature, causing harm to the vegetable root system. Moreover, the utilization rate of compound fertilizer is relatively low, so in winter topdressing, water-soluble fertilizer and microbial bacterial fertilizer should be used as the main topdressing fertilizers.
4. Combine underground topdressing with foliar fertilizer
In winter, the temperature in greenhouses is low. To obtain high yields of greenhouse vegetables, in addition to applying sufficient base fertilizer, fertilization should also be carried out by combining topdressing with flushing fertilization. This not only saves time and effort, but also has relatively high fertilizer efficiency and is conducive to improving vegetable quality. For example, vegetables in greenhouse rooms are very prone to deficiency of calcium, boron, iron, manganese, etc., so low-concentration calcium chloride, superphosphate, ferrous sulfate, and borax solutions can be sprayed on the leaves.
The above is an introduction to the precautions for fertilizing greenhouse vegetables in winter. I hope it can help you. If you want to learn more related knowledge, please follow us.