Spraying foliar fertilizers on grapes, leaves with a wide range of fertilizers, rapid fertilizer efficiency, and labor-saving fertilizers are common fertilization methods for grapes. The absorption of the fertilizer is started 2 hours after spraying, and the urea can be absorbed by 88% within 24 hours after spraying. Spraying 0.2%～0.3% urea during flowering, adding 0.1% boric acid or borax or multi-element boron fertilizer mixture can increase fruit setting rate; spraying superphosphate solution at maturity of young fruit and berry can make the fruit sugar content. Significantly improved, and enhance resistance to disease; spray potassium fertilizer during the growth period of berries, the yield can be increased by 7% to 10%, sugar content increased by 1.5% to 2.5%; the softening of the initial spraying of rare earth berry solution, increase production and sweetening. To achieve the best results for foliar spray, you should master the following technical points:
1. The suitable period for spraying fertilizer. In general, foliar fertilizers can be applied throughout the growing season of the grapes. It is best to spray the “tip fertilizer†before the growth of new shoots; to spray the “stabilizing fruit fertilizer†during flowering and fruit setting; Application of "strong fruit fertilizer", the entire growth and development process, the lack of prime disease, should be promptly symptomatic spray fertilizer remedies. In terms of fertilizer types, nitrogen fertilizers should be sprayed before and after sprouting, leaf spreading, and flowering; from the spring shoots to the ripening stage, especially during the period from the new shoot growth to the berry enlargement, spraying phosphate fertilizer is the best; During the expansion period, the best potassium fertilizer was sprayed; the effect of spraying boron was good during the flowering period;
2. Appropriate fertilizer and spray concentration. The commonly used nitrogenous fertilizers are 0.2%-0.4% urea aqueous solution, 0.3%-0.5% ammonium sulfate, ammonium nitrate aqueous solution; phosphate fertilizer is 2%-5% calcium superphosphate leaching solution; potassium fertilizer is 0.4%-0.5% potassium sulfate aqueous solution. 1% potassium nitrate aqueous solution; potassium dihydrogen phosphate potassium phosphate fertilizer, spraying concentration of 0.2% to 0.3%. Plant ash is also a good potash fertilizer, and the general spray concentration is 3%. Trace element fertilizers include 0.1% to 0.2% borax or boric acid or multi-element boron fertilizer solution, 0.05% to 0.15% zinc sulfate solution, 0.1% ferrous sulfate solution, 0.1% magnesium sulfate solution, 0.05% to 0.1% The manganese sulfate solution, rare earth is a 0.05% to 0.1% rare earth nitrate aqueous solution.
3. Spraying weather and time. Foliar spray fertilizer is affected by wind, temperature and humidity. Within a certain range, the higher the temperature, the faster the leaves suck fat; the higher the humidity, the more suction fertilizer; the smaller the wind speed, the more time the fertilizer solution is moist on the leaves. Longer, so more fat and less loss of drift. In order to improve the effect of spray fertilizer, it is best to choose a cloudy and dry application without wind, and it is better to do it in the evening or in the morning with good temperature (18°C～25°C), high humidity, and low evaporation.
4. Spray fertilizer method. The stratum corneum is thinner than the old leaf, and the amount of fertilizer solution is large; the stomata on the back of the leaf is more than the leaf front and the absorption is fast. Therefore, grape spray fertilizer should be mainly shoots, young leaves and foliage. Spraying fertilisers strives to make fine grain of the fog so as to make it evenly and densely sprayed until the leaves are all wet and the fertilizer drops without falling. Daejeon Grapes is equipped with a knapsack sprayer and a mist sprayer. The elevated grapes are sprayed with high pressure. It is usually sprayed 4 to 6 times during the annual growth cycle. According to the needs of a variety of nutrient mix spray, but also with fungicides or insecticides pesticides (including plant growth regulators) mixed spray. In order to facilitate the adhesion of the fertilizer solution on the leaf surface, 0.1% to 0.2% of a neutral laundry detergent may be added to the fertilizer solution as an adhesive.
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