First, the management of temperature
According to the requirement that the grape sprouts from the beginning of warming to a temperature greater than or equal to 10°C and an accumulative temperature of 450°C to 500°C, the unheated solar greenhouse will be dehumidified from the middle of January. After warming up for 30 days, the grapes sprouted. Since greenhouses cannot be covered with curtains for planting grapes, the temperature-raising germination period should be shifted accordingly.
During warming and germination, the temperature should not be too high. If the temperature rise is too high, too fast, will prompt the buds to germinate prematurely, and the ground temperature has not yet come up, the roots can not be normal activities, will make the grapes aboveground and underground growth incoherent, germination is not rectified order Qi, bad ear development. Therefore, starting from the opening of the curtain, the first week, the temperature should be maintained at 15 °C ~ 20 °C, the night temperature should be maintained at 6 °C ~ 10 °C; the second week, the temperature should be maintained at 15 °C ~ 20 °C, while the night temperature should be raised to 10 °C ~15 °C; the third week, the temperature should be proposed to rise 20 °C ~ 25 °C, the night temperature should be maintained at 13 °C 15 °C, until budding.
Second, the management of humidity
The pre-germination period of grape cultivation in protected areas is the period of maximum water requirement during the growth period. If the water supply is insufficient during the germination, the germination period is prolonged, the germination rate is decreased, or the germination is not neat. Therefore, after the germination begins, it is necessary to adequately fill a few times with water, the amount of water is about 30 mm, and the irrigation is repeated 2 or 3 times, and the ventilation openings of the greenhouses are closed so that the relative humidity of the air in the shed is kept above 90 Torr. During the day with the increase of temperature, the relative humidity of the air often drops. At this time, tools such as a sprayer can be used to spray water on the grape shoots, resulting in an artificially humid condition, and the buds can germinate early.
Sun Shade Netting,Shade Netting For Vegetables,Green Sun Shade Net,Green Net For Sun Protection
Changzhou Satidi Import and Export Co., Ltd. , https://www.guanjiejt.com