In order to achieve premature grapes, most grapes nowadays break the dormancy by physical and chemical methods to achieve this goal. The need for refrigeration is a key influence factor. Cooling requirement refers to the accumulation time of effective low temperature at 0~7.2°C. Temperature above 10°C or below 0°C is not effective, and the coldness is not enough. After budding and blooming, the fruit setting rate is low. The required cooling of grapes is usually between 1000 and 1500 hours. Due to different varieties, the amount of cold required is also different. Generally, early-maturing varieties require less cold, and medium- or late-maturing varieties require more cold. Physical sleep The average temperature in the late autumn is stable to 6-7°C. 1 At the early stage of precooling, the grasshoppers are lifted and ventilated overnight to enter the cold air. During the daytime, the grasshoppers are closed and the ventilation is turned off to keep the temperature within the shelters low. 2 The pre-cooling day and night cover grasshoppers to prevent nighttime temperatures from being too low. 3 At the late stage of precooling, the grasshoppers should be uncovered during the daytime and covered at night to ensure that the temperature in the shed is moderately increased, and the shed is guaranteed to be around 7°C. Precautions Artificial centralized pre-cooling standards: the temperature is generally 2-7 °C, on the one hand so that the temperature is maintained in the use of sleep temperature range, on the other hand to avoid the ground temperature is too low, conducive to warming when the ground temperature is coordinated; generally before the shed, Hit the lime sulfur mixture to prevent contamination of the shed film, and drench the water, then you can cover the shed; you can increase the ground temperature by covering the mulching film. With leaves dormancy: dormancy when leaves have not been frost damage, artificial pre-cooling treatment. Urea can be sprayed ahead of time to promote defoliation. Chemical sleep 1 commonly used breaking agent: 1 lime nitrogen is the powder placed in a non-ferrous container, adding 4 times warm water of about 50 °C, stirring and standing for 3 hours, take the supernatant (PH = 8 agents show a stable break Sleep effect), spray or apply. There may be some differences in the proportions of different varieties (general ratios are between 16% and 21%). 2 The dicyandiamide is usually sprayed at 1%-5% (following instructions). 3 Fertilizer potassium nitrate, 200 times urea and GA3 combined, also have the effect of breaking dormancy. 4 Studies of other substances in foreign countries have shown that with 3%-8% of garlic juice sprayed or smear buds, there are also early sprouting, lifting dormancy. Precautions The use of the deodorant agent is generally required when the amount of cold to 3/4, after the budding of the grapes, the growth of the shoots is prolonged, and it is prone to phytotoxicity later. This needs to be combined with experience to find the most suitable time. Http:// Powder For Injection,Benzylpenicillin Potassium For Injection,Ceftiofur Sodium For Injection,Poultry Medication Sichuan Aibang Weiye Biological Engineering Co., Ltd. , https://www.aibangpharm.com
Grape Breaking Tips