First, temperature management is essential for grape sprouting and germination. The minimum temperature required for sprouting is 10°C, and the accumulated effective temperature should be between 450°C and 500°C. In unheated solar greenhouses, the warming process begins in mid-January, and after about 30 days of gradual warming, the grapes start to sprout. It’s important that the temperature rise is not too rapid, as this can lead to premature sprouting, which may cause imbalance between the above-ground and below-ground growth. Therefore, it's crucial to manage the temperature carefully during this period.

During the temperature rise and germination phase, the temperature should be gradually increased. For the first week, the daytime temperature should be kept between 15°C and 20°C, and the nighttime temperature should stay between 6°C and 10°C. By the second week, the daytime temperature can be raised to 15°C–20°C, with nighttime temperatures reaching 10°C–15°C. In the third week, the temperature should be increased to 20°C–25°C, while keeping the nighttime temperature around 13°C–15°C until full germination occurs. This careful temperature control ensures balanced growth and healthy sprouting.

Second, managing humidity is equally important. During the germination stage, grape plants require high moisture levels. If water supply is inadequate, it can delay germination or result in uneven sprouting. After the sprouting process begins, it’s recommended to water the plants thoroughly several times, with each irrigation providing approximately 30 mm of water. The greenhouse vents should be closed to maintain a relative humidity of over 90%. As the temperature rises during the day, the humidity may drop, so using a sprayer to mist the grape vines helps maintain optimal conditions and promotes faster germination.

 

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