The sudden drop in temperature in early spring has a great impact on tree health, flower bud differentiation, fruit yield and quality. It is necessary to understand and pay attention to the effect of early spring cooling on the growth of grapes, and take anti-freezing and remedial measures as early as possible. Pay attention to weather changes It is necessary to fully understand the possibility and disastrous nature of frost damage, and raise awareness of prevention. If necessary, set up your own actual temperature and ground temperature observation and recording station in the park, and pay attention to weather changes and weather forecasts in time, predict the time and intensity of frost, and take emergency preventive measures. Delay germination, avoid freezing damage In areas where disasters frequently occur, measures such as early spring irrigation, whitening tree trunks, and laying black mulch film, are used to reduce ground temperature and slow the temperature rise of the tree, delay the germination of grapes to avoid freezing damage. Orchard irrigation and fertilization before freezing For grapes cultivated in the open field, irrigation and fertilization in the park 3~5 days before the onset of freezing damage can improve the soil structure and enhance its heat absorption and warmth performance, thereby improving the tree body's ability to resist freezing. 2 to 3 days before freezing damage, spray amino acids, alginic acid, chitosan oligosaccharides, etc. on the whole plant to increase the concentration of cell fluid, increase the toughness of cell membranes, and enhance the frost resistance of the tree. Smoke and frost The night before frost damage occurs, smoke at the upwind. The smoke material can be flammable materials that can produce a large amount of smoke from crop straws and weeds. The smoke produced can block the heat loss on the ground and play a role in heat preservation. However, this method pollutes the atmosphere and is only suitable for short-term freeze damage prevention in local orchards. Facility cultivation to increase temperature and heat preservation Before freezing damage, grapes grown in greenhouses can be heated using incandescent lamps, gas lamps, candles or special heating equipment. Cover the outside of the shed with straw felt or insulation quilt. In addition, add pressure cords on the straw or insulation quilt to avoid being blown up by strong winds. At the same time, pay attention to the safety protection of the roller shutter and the motor. Emergency after freezing For vineyards suffering from freezing damage, the following remedial measures can be taken. After the frost damage is over, the lighter damaged shoots will cut off the dead tips and young leaves on the top of the new shoots, so that the shoots under the cut will germinate as soon as possible. For moderately injured shoots, cut off the frozen dead parts of the new shoots, prompting the buds at the lower node of the cut to germinate as soon as possible, the upper sprouted auxiliary shoots maintain prolonged growth, and the middle and lower leaves retain 2 to 3 leaf toppings. If the damage is serious, the new shoots will be cut off from the base, so that the original shoots of the mother shoots will germinate as soon as possible. In order to restore the tree vigor as soon as possible after freezing damage, the tree body nutrition should be supplemented to enhance the tree vigor. It can be sprayed with functional foliar fertilizers such as amino acids, alginic acid and chitooligosaccharides to restore tree vigor, protect young and injured leaves, promote the growth and development of inflorescence, and increase fruit setting rate. After freezing damage, plow the soil in time to prevent soil compaction and increase the air permeability of the soil. At the same time, topdressing special fertilizer for grapes, soil conditioning fertilizer, humic acid fertilizer, etc., enhance the vitality of grape roots. In addition, it is necessary to increase the prevention and control of diseases and insect pests. Because the tree body of the frozen tree is weaker and less resistant to diseases, it is very easy to be attacked by diseases and insect pests. In production, the prevention and control of diseases and insect pests should be strengthened, especially the prevention and control of diseases, and timely spraying and killing insects Fungicide. For vineyards that have been severely affected and near-zero production, if the growth time is sufficient, the following measures can be taken to cultivate secondary fruit. 1. Leave all the branches of the current year for 1 to 2 knots or stubble from the base to clear the garden. Spray the whole garden with insecticide and fungicide once. 2. Timely fertilizing and cultivating the soil to loosen the soil to enhance the vitality of the grape root system, so that the tree can resume growth and re-germinate as soon as possible; when the sixth leaf of the new branch grows to the size of an egg, leave 6 leaves for topping. 3. After topping, remove all the accessory shoots from the lower part of the branches in batches, and retain 1 to 2 accessory shoots at the top depending on the variety characteristics and plant growth. 4. The 1-2 accessory shoots retained at the top are pinched once every 2 to 3 leaves, and the pinching lasts for 25-30 days to promote the flower bud differentiation of the winter buds at these two nodes. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Tetanus Toxoid Vaccine,Toxoid Vaccine,Hep B Immune Globulin,Immunoglobulin Injections,Tetanus Antitoxin,Varicella Vaccine FOSHAN PHARMA CO., LTD. , https://www.pharmainjection.com
To cope with the cooling, the vines need to be prepared