July-September is the transitional maturation period of most grape varieties, which is often accompanied by high temperature and rainy weather. Good management of this period is crucial for grape quality and yield. The main management measures are as follows:
Reasonable watering If it is not dry weather, do not always water, proper water control is conducive to turning. If drought is not watering, try to drip or irrigate the plant. Flood irrigation will affect the accumulation of sugar and the coloration will be slow.
For the expansion of color fertilizers, fertilizers with medium-nitrogen, low-phosphorus and high-potassium (15-10-30) fertilizers can be used. In the color-changing period, fertilizers with micro nitrogen, low phosphorus and high potassium (4-10-50) should be used. If potassium nitrate is used during the color conversion period, excessive nitrogen will be stored in the plants, which is not conducive to coloration. Spraying 0.2% to 0.3% of potassium dihydrogen phosphate on the leaves also has a certain effect on sugar increase and coloration.
Birds are prevented from beginning to color and birds begin to feed. If they are not protected against bird nets, they will become more and more harmful as a result of ripening. After grape seeds are foraged, on the one hand, it will affect the commercial nature, and on the other hand, it will cause Disease occurs.
To prevent grain softening, the calcium absorption by the root can not meet the demand of calcium in the period of grape softening and coloring. Spraying calcium on the leaf can prevent the symptoms of calcium deficiency in the fruit. At the same time, the use of hormone-like swelling agents and red-hormone fertilizers was excessive in the late fruit enlargement, and the soft fruits were more severe.
Disease control 1 Downy mildew: alternating use of 70% Proseden 600 times + 25% Methophorus 600 times, 72% Methanochrome Mn 600 times + 25% Methotrexate 600 times Urea, 25% pyrazole Sterolactone 1500 times + 80% dimethomorph 3,000 times. 2 Acid rot disease: 2.5% lambda-cyhalothrin 1000 times + 25% pyraclostrobin 1500 times + Beibo fluorosiliconazole 1000 times. 3 White rot, anthrax: 25% love can be 1500 times +10% difenoconazole 2000 times, 45% fenozole prochloraz 2000 times + 25% pyraclostrobin 1500 times.
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