With the intensification of global climate change, the frequency of extreme weather such as high temperature and drought across the country has accelerated in recent years. Tea trees are extremely sensitive to temperature, humidity and moisture conditions. Therefore, tea gardens are vulnerable to extreme weather hazards such as high temperature and drought, which seriously affect the normal growth of tea trees and the yield and quality of tea. Therefore, it is very important to strengthen the prevention and control of high temperature and drought in tea gardens.
What if the tea garden encounters high temperature and drought!?
Let's deal with it in three simple ways:
First, irrigation. Tea gardens with irrigation conditions should make every effort to adjust water sources, and adopt drip irrigation, sprinkler irrigation and other methods to irrigate. It can resist high temperature and drought and high temperature burns. Sprinkler irrigation has the best overall effect, and drip irrigation is the most water-saving for drought resistance. If there are fixed or mobile sprinkler and drip irrigation facilities, facilities should be used for sprinkler irrigation as much as possible, and the maintenance of irrigation facilities should be done well to ensure that they can work normally when necessary. Sprinkling and watering in high temperature weather should be carried out in the morning and evening. If conditions permit, it can be sprayed once in the morning and once in the evening. It is better to have 90% soil relative humidity as the irrigation water.
Second, shading and cooling. Shading with shading nets in tea gardens can avoid direct sunlight, reduce temperature, increase humidity and reduce evaporation. The temperature of tea canopy can be reduced by more than 8 ℃, which is one of the most effective high temperature resistance measures at present. It can be covered by canopy or tea tree canopy directly. Canopy covering is to set up a canopy 1.8-2.0 meters above the ground in the tea garden to cover the sun screen; For crown covering, the shading net is directly covered on the surface of the tea canopy, and the periphery can be fixed. 75 black shading net with a shading rate of 75% and a width of 1.8 meters can be selected, and the dosage per mu is about 450 meters.
Third, cover with straw. Spreading grass between rows of tea trees can effectively reduce ground temperature, reduce soil water evaporation, facilitate water storage, and improve the high-temperature stress resistance of tea trees. For young tea gardens, straw is directly applied to cover the tea gardens, and the effect of high-temperature drought resistance is more significant. The principle of spreading grass in the tea garden is that there is no soil after spreading grass. Straw, green manure and legume plants can be used as forage, and the thickness of spreading grass is about 8 cm.
In addition, before the high temperature alarm is lifted, it is recommended not to weed, spray or loosen the soil, so as to prevent it from backfiring.
