In winter, when the temperature is low, the application of biological bacterial fertilizer can not only activate nutrients fixed in the soil, but also facilitate the growth of the root system, but it should not be applied blindly. It should be determined according to the soil environment of different greenhouses, otherwise it is likely to be spent. Money does not see results. First, the soil moisture application of biological bacteria must pay attention to reasonable watering, the best choice for sunny morning water, so that not only can increase the temperature, but also through the release of moisture. Pay attention to the best scratching after watering, in order to increase soil permeability, conducive to the effectiveness of biological bacteria. Second, the soil temperature It is understood that biological bacteria in biological bacteria generally in the soil 18 °C ~ 25 °C when the most active life activities, 15 °C below the beginning of life activities began to decline, 10 °C below the activity has been very weak or even sleep. This requires first controlling the temperature in the shed to promote temperature rise with the temperature. In general, the temperature in the shed should be maintained at 25°C to 30°C during the day, and the temperature in the shed at night should be low. To prevent the ground temperature from dissipating, and to maintain the ground temperature constant, in addition to the mulching, the straw can be covered in the operation line. The third is the soil pH information shows that: the soil pH value of 6.5 to 7.5 is most suitable for the propagation of biological bacteria, vegetable farmers can be adapted according to their own soil conditions, so that the soil pH value of 6.5 to 7.5, to ensure the proliferation of biological bacteria. In addition, the role of biological bacterial fertilizer is achieved by the decomposition of organic matter in the soil by the organism. If the organic fertilizer in the soil is insufficient, it cannot be decomposed. Therefore, before planting vegetables, we must pay attention to the application of organic fertilizer, usually about 5000 kg per mu. Vitamins are a type of trace organic substances that humans and animals must obtain from food in order to maintain normal physiological functions. In terms of physiological functions, vitamins are neither a raw material for tissues nor a substance for supplying energy, but they are an indispensable substance for the body. It has many types and different chemical structures. Most of them are the components of the coenzyme (or prosthetic group) of certain enzymes. They are the indispensable compounds for maintaining the normal growth (growth, health, reproduction and production function) of the body. It plays a catalytic role in the body to promote the synthesis and degradation of major nutrients (proteins, fats, carbohydrates, etc.), thereby controlling metabolism. Vitamins are essentially low-molecular organic compounds. They cannot be synthesized in the body, or the amount synthesized is difficult to meet the needs of the body, so they must be supplied from the outside. The daily requirement of vitamins is very small (usually measured in milligrams or micrograms). They are neither a raw material for body tissues nor a substance for energy supply in the body. However, they do not regulate material metabolism, promote growth and development, and maintain physiological functions. Vitamin K2 MK-7, Vitamin C, Vitamin E, Vitamin K2, Vitamin H, Vitamin D3 Xi'an Gawen Biotechnology Co., Ltd , https://www.ahualyn-bio.com