The use of whitening agents on the main trunk and the center trunk (about 1.5 to 1.6 meters from the ground) and the main branch (if necessary) will help the fruit trees safely pass winter. The proportion of whitening agent preparation: 2 parts of quicklime, 1 part of solid lime sulfur, half of salt, and 10 parts of water. Preparation method: first with hot water, add cold water and dilute and mix evenly. Can also be in accordance with the following formula: water 30 kg + 10 kg of white ash + salt 2 kg + 2.5 kg of animal oil + 1.5 kg of lime sulfur stock solution. The whitening of trunks not only removes hidden germs and pests, but also reduces shoot sticking and frost damage. At the same time, the whitening of young trees can effectively prevent the hares from feeding on the bark.
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