Pre-harvest management of wine grapes
1. Pay attention to the amount of load. Cabernet Sauvignon and Merlot have a yield of 1000 kg per mu. The nobleman incense and white jade produce 1500 kg per mu (according to the year, it floats 15%). Such a reasonable load can leave sufficient room for the tree to produce nutrients at a later stage and promote new shoots. Normal maturity ensures that the grapes will produce good quality.
2. The premise of qualitative sugar. In the later stage of growth, the application of nitrogenous fertilizers and the application of more phosphorus and potassium fertilizers will increase the sugar content of fruits, promote the coloring of fruits, and prevent shoots from growing in length. Foliar application of 0.3% boron fertilizer, potassium dihydrogen phosphate and aqueous sugar solutions 1 to 2 times. If no sugar-enhancing fertilizer is applied, it can be applied before August 15th, applying 10-15 kg of diammonium and 15-20 kg of potash (according to the amount of production plus or minus). And promptly rule out the accumulation of water after the rain.
3. Pick up the old leaves in time. After entering in August, the tip of the grape plants and the secondary shoots must be picked up in time, and the secondary shoots must leave a leaf repeatedly topping to facilitate the lignification of shoots. The leaves after aging should be removed in time to reduce the consumption of nutrients and improve the ventilation and light transmission conditions. Removal of 2 to 3 old leaves from the base of the new shoot about 20 days before the deciduous leaves is very beneficial to the promotion of buds and shoot ripening. Not too much, take away old leaves that are only consumed and can't make nutrients.
4. Autumn fertilizer applied early. Early in the fall, organic manure is applied, and the ground temperature is high, which is conducive to the decomposition of organic fertilizers. The severed roots are quickly healed, and new roots can be produced quickly; this is conducive to the maturation of new shoots and the differentiation of flower buds; it is beneficial to the overwintering of grapes and the growth results in the following year. Therefore, as early as autumn basal fertilizer the better, it is best to bring fruit fertilization, ditch Mushi high-quality organic fertilizer 4000 to 5000 kilograms, superphosphate 50 to 80 kilograms or ternary compound fertilizer 50 kilograms.
5. Control pests and diseases. This period coincides with the rainy season, where all kinds of diseases are at a high incidence, and the prevention and treatment will often cause serious losses. DuPont Epro is a kind of bactericide that is extremely resistant to rain erosion. It is recommended to use 2 or 3 times in this period, with an interval of about 12 days, which guarantees both the leaves and the fruit. In case of heavy rain and hail, use DuPont Fuxing 8000 times spray in time to prevent the white rot from spreading. The fruit is nearly a mature period of high incidence of anthrax, with Dupont Wanxing 2000 times to control 1 or 2 times, the effect is obvious.
6. Strengthen soil management. Often weeding and weeding, timely drainage, reduce water supply, in order to facilitate the mature branches, promote flower bud differentiation, improve fruit quality.
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