As a top-dressing fertilizer, biogas slurry has been widely used in greenhouse vegetables. It not only has a fast-acting nutritive ability, but also has a high nutrient availability. It is a multi-organic compound fertilizer that can effectively increase crop resistance and control disease occurrence, but it is in use. Burning seedlings, burning roots, ammonia damage, etc. are prone to occur. The following points should be noted in the application of biogas slurry: The raw liquid must be fully decomposed. The raw liquid in the middle and upper layers produced during the fermentation process is called biogas slurry. Without application of biogas slurry that is not ripe or mature, application can easily cause large areas of vegetables to burn roots. When selecting the biogas slurry, the vegetable grower should select the biogas slurry in the storage tank or storage tank for more than 3 months. The use of biogas slurry in the water-saving greenhouses generally uses the method of flushing with water. It is simple and easy to operate, but it is prone to burning. Especially after the early spring, the temperature of the shed gradually rises, and it is more likely to occur during the application of biogas slurry. It is recommended that vegetable growers mix the biogas slurry and water in a ratio of 1:2 4-5 days before application, and flush with water after use. Do not over-apply excessive surface concentration of the biogas slurry in the greenhouse, which may cause crop water loss. Therefore, the biogas slurry is not easily overdosed as a top dressing. In general, a greenhouse with a planting area of ​​1 mu will be rushed to 4-5 parts of the blending liquid and watered about 20 square meters. Note that when the ventilation is flushed with water, the enclosed high-temperature environment in the shed can easily cause ammonia gas that is not fully decomposed in the biogas slurry to release ammonia gas, causing ammonia harm or burning of roots. Therefore, it is necessary to strengthen ventilation and discharge ammonia gas after flushing. Fireproof Alkali Biogas Slurry A lot of livestock husbandry farms use fire alkali disinfection method. The remaining residues are flushed into the digester pool for ecological fermentation, and the biogas slurry produced after fermentation is sold to farmers. Such biogas slurry applied to the ground not only reduces the effect of fertilizer, but also easily causes the increase of soil salt content. Therefore, farmers must be cautious when selecting biogas slurry. It is best to use PH test paper to test and try to prevent alkaline biogas slurry. Infrared Forehead Thermometer,Portable Infrared Thermometer,Non Contact Forehead Thermometer Gun Dongguan Keyutai Mask Co., Ltd. , https://www.maskkytai.com