Frost is the sudden drop in air temperature, and the surface temperature drops below 0°C, causing crop damage and even death.
Water spray method: When forecast frost occurs, spray water 2 or 3 times on crops or plastic film at 2-3 in the morning and spray once every hour. In the early morning, due to the high humidity and humidity between the field air and the plants, the latent heat of condensation will be released when the water vapor condenses into dew drops. At the same time, the water temperature is higher than the temperature, and the water will release heat when it condenses on the crop. Therefore, the water spray method is generally not used for defense. There will be frost formation.
Irrigation: Irrigate the water one evening before the expected frost. Because of the large heat capacity of water, the thermal conductivity is good. Irrigation can not only increase soil moisture, but also increase the air humidity near the ground floor, which can reduce the degree of radiation of long-wave radiation at night, thus protecting the ground heat, and can increase the temperature of the formation about 2°C. Wet soil has higher heat capacity and thermal conductivity than dry soil. It absorbs sunlight energy during the day and can store more heat, and it is stored in deep soil. It can release heat from the deep layer to the surface of the ground when the surface radiation heats up at night, which can delay The temperature near the surface decreases.
Smoke smoke method: According to the weather forecast, when the low-temperature frost is approaching, weeds, dead branches, fallen leaves, etc. are smoked in the upper wind. Before the ground temperature has not been radiated in large quantities, it is ignited and allowed to burn slowly to increase the temperature near the surface gas layer and prevent the cold air from sinking to prevent frost. Smoke smoke can generally increase the surface temperature by 2~3°C. However, this method can pollute the atmosphere and is only suitable for short-term frost and use in valuable crop fields.
Coverage method: Before the onset of the cold wave, cover crops or ground with straw, weeds, straws, mats, or nylon membranes, or bundle the entire plant. This will prevent cold air from attacking outside and reduce heat loss from the ground. It can both protect the leaves from frost and protect the heart and growing points from frost.
Fertilization method: 3 to 4 days before the onset of frost, fertilizing manure, compost, grass and wood ash and other warm fertilizers in the field can not only improve the ground temperature and soil fertility, but also make the crop grow vigorously and enhance the ability of the body to resist cold. After the frost is frosted, timely management of fertilizers, watering, loose soil, etc. shall be carried out on the frozen crops, and timely spraying shall be taken to prevent the occurrence of diseases.
Wind barrier method: Before the onset of frost, wind barriers are set northwards in the crop fields to prevent cold winds from invading, so that crops can be reduced or protected from the hazards of cryogenic frost.
Perturbation method: Radiant cooling occurs in local areas during the night, and the ground temperature is low, and the weather conditions when the temperature is high at a height of 10 to 20 meters above the ground are called temperature inversion, and frost often occurs. People often turn on large fan blow disturbances to mix warm and cold air and raise the ground temperature to prevent frost.
Heating method: The use of coal, charcoal, firewood, heavy oil and other combustion to increase the temperature of air and plant body to prevent frost is a widely used method. In order to prevent frost, some orchards dig “ground stoves†before the frost appears. They burn the hay, branches, etc. in the “stove†to release heat, so that the surrounding temperature rises, and the plants will not be frosted. The effect is very good. .
Sex Enchancer Powder Category Series Dapoxetine Hydrochloride Raw Powder, Yohimbine Hcl, Vardenafil Raw Powder, Tadalafil Raw Powder, Sildenafil Raw Powder, Flibanserin Raw Powder, Avanafil Raw Powder
The certification of analysis and the HPLC test results can be provided. We test the products before shipping to guarantee the top quality.
Our Hot Sales products are:API Powder China Steroid Raws Powder Oil/ Sarms/ Bodybuilding Peptide sell on line.
Sex Enchancer Powder,Sex Enhancer Powder,Male Sex Enhancer Powder,Natural Men Sex Power
Shaanxi Kang New Pharmaceutical co., Ltd. , https://www.kangnewpharma.com