1. Measures to prevent ammonia hazards
The first is to apply ammonia fertilizer, the use of organic fertilizer as the base fertilizer, must be fully rotted; Chemical fertilizers and organic fertilizers can only be applied deeply, not on the ground; Fertilization should not be excessive. In the shed, you can check the ammonia concentration, you can use the pH test strip to test the pH of the water droplets in the shed, when the pH value is above 8.2, it is necessary to ventilate and deflate to reduce the concentration of ammonia. For the situation where ammonia disinfection has occurred, the first thing is to ventilate and exhaust, then quickly water, reduce the concentration of soil fertilizer, spray active liquid fertilizer outside the root, the concentration is 1:500 times liquid, and the pH of the plant and soil is better balanced, which can alleviate the symptoms of poisoning.
2. Reasonably control humidity
To control the number of watering, reduce the humidity of the shed, but also ensure that the moisture can meet the needs of crop growth and development, the greenhouse is covered without drip film, which can reduce air humidity. If ridge cultivation is used, mulch film can be covered, which not only retains soil moisture, reduces evaporation, but also reduces air humidity. Vegetables should be reasonably densely planted to facilitate permeability and reduce humidity, and before mulching after colonization, it should be cultivated and loosened in time after watering to reduce evaporation and maintain soil moisture.
3. Increase the floor temperature of the shed
When cultivating vegetables in winter greenhouses, it is best to choose a transparent mulch film, which can not only increase the ground temperature, but also have the effect of weeding, and at the same time, it is necessary to do a good job in the management of vegetable plants and adjust the structure of the field.
4. Control the temperature
Adjust the greenhouse temperature to the suitable growth range of vegetables, you can hang a thermometer on the top of the vegetable, the general ground temperature can be 3-7 degrees lower than the growth point Note, if the growth point temperature is 34 degrees, then as a suitable temperature between 27-30 degrees, this temperature range is the most suitable temperature for photosynthesis. When cultivating in sheds, it is necessary to cover the mulch film to ensure sufficient soil water supply, plus the transpiration of vegetables, reduce the leaf temperature, so that the leaf temperature is about 3-5 degrees lower than the air temperature. If the greenhouse floor temperature is low, it is not only not conducive to the growth and development of the root system, but also affects the absorption of the root system, causing a variety of diseases. Generally, the ground temperature of the soil layer of about 5 cm during the day can be 5-7 degrees lower than the temperature of the shed, and the temperature is 3-5 degrees higher than the temperature at night.