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Protected grape temperature and humidity management
Protected cultivation of grapes is generally covered with straw from mid-November and covered in grass. There is no light in the greenhouse. Eurasian varieties need to be cooled for 1200-1400 hours, European and American hybrids need 1000-1200 hours, and the temperature is maintained at 0-7 degrees Celsius. , Sleep will be released after late January. After lifting the dormancy, you can uncover the grass and use the sun to warm the temperature, and warm up after more than 30 days after warming up. The maximum temperature during the day is 30-32 degrees Celsius during the day and 5-7 degrees Celsius at night. From the bud to the flowering period, the minimum temperature is above 10 degrees Celsius, the maximum temperature is 28 degrees Celsius, and the minimum flowering temperature is above 15 degrees Celsius. The best temperature is 18-28 degrees Celsius. From fruit enlargement to coloring, the minimum temperature is controlled at 15 to 25 degrees Celsius, the maximum temperature is 28-30 degrees Celsius, the fruit is colored to maturity, the night temperature should be 15 degrees Celsius, the maximum should not exceed 20 degrees Celsius, and the daytime temperature should be 25-30 degrees Celsius. . The use of sunlight to increase the temperature began immediately poured a germination of water, in order to reduce the greenhouse humidity, immediately after the foot can be covered with plastic film on the ground, not only improve the ground temperature, but also reduce the air humidity. After germination to inflorescence display, indoor relative humidity is controlled at about 80%; after inflorescences reach out, it is controlled at 70%; flowering period to fruit setting period is 65%-70%; after sitting and staying fruit, till the berry period is 70%, coloring period To maturity control at about 65%, if the humidity is too large, you should open the top outlet, remove indoor vapor, as much as possible to maintain the appropriate temperature and low humidity conditions. With the increase of temperature in the spring and the flexibility to uncover the haystacks, it is generally possible to remove grasshoppers in Beijing in mid-May, and remove the plastic film after picking and enter normal management.