according to the meteorological department of hebei province, affected by cold and warm air, there will be rain and snow from march 16 to 18. at time, it is the growing time of facility grapes with poor cold resistance. in order to prevent the harm caused by the cold air to protect grapes, on march 15, a research team led by professor guo zijuan from changli fruit research institute carried out the technical guidance in nearby grape cooperatives and farms.
several guidance as below:
1.the greenhouse should be covered with thermal insulation. ensure that the inner and outer membrane or insulation cover tightly and press the edge. if there is extreme weather, it should extend the coverage time of the insulation.
2.use heating block or smoke to raise the inside temperature of the greenhouse.
3.reduce low temperature operation to prevent disease.
