Summary of the Latest Key Points for Winter Greenhouse Vegetable Management
In winter, as daylight hours grow shorter and light intensity weakens, photosynthesis in vegetables correspondingly declines, so the nutrients synthesized are also reduced. In addition, soil temperature drops in winter, which very easily leads to problems such as weakened vegetable growth and poor fruit development. So how should greenhouse vegetables be managed during the low-temperature winter season? Let's take a look.
1. Keep good control of temperature
First, adjust the greenhouse temperature to within the range suitable for vegetable growth. A thermometer can be hung at the top of the vegetables. Generally, the soil temperature can be 3-7 degrees lower than that at the growing point. Note that if the temperature at the growing point is 34 degrees, then the suitable temperature is between 27-30 degrees, and this temperature range is the most suitable for photosynthesis. When cultivating in a greenhouse, plastic film should be laid on the ground to ensure an adequate soil water supply. Combined with the transpiration of the vegetables, this lowers leaf temperature, making leaf temperature about 3-5 degrees lower than air temperature. Raising the air temperature in the greenhouse helps raise soil temperature. If the soil temperature in the greenhouse is relatively low, it will not only be unfavorable for root growth and development, but will also affect root absorption and cause the occurrence of various diseases. Generally, during the day the soil temperature at about 5 cm deep can be 5-7 degrees lower than the greenhouse air temperature, and at night it should be 35 degrees higher than the air temperature.
2. Reasonably control humidity
Control the frequency of watering and reduce greenhouse humidity, but also ensure that water can meet the needs of crop growth and development. Covering the greenhouse with drip-free film can reduce air humidity. If ridge cultivation is adopted, plastic film can be laid on the ground, which not only maintains soil moisture and reduces evaporation, but also lowers air humidity. Vegetables should be planted at a reasonable density to facilitate air circulation and reduce humidity. After planting and before laying the film, the soil should be cultivated and loosened in time after watering to reduce evaporation and maintain soil moisture.
3. Raise the soil temperature in the greenhouse
When cultivating vegetables in greenhouses in winter, it is best to choose transparent plastic film, which can not only raise soil temperature but also, if it also has a weed-control effect, help with that. At the same time, good work should also be done in pruning and removing side shoots of the vegetable plants and adjusting the field structure.
The above is an introduction to the key points of winter greenhouse vegetable management. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.