Eucommia ulmoides, Magnolia officinalis, and Astragalus membranaceus are skinless Chinese medicinal tree species. The following methods can increase their yield.
The knife divides the trunk. In the tree trunk 30 to 100 cm away from the ground, with a knife obliquely cut a few knives, depth to slightly injured xylem degree, the gap should be left between the knife. This will allow more organic nutrients to accumulate on the bark, thereby increasing production. This method can be conducted once each spring and summer four years before the tree is peeled.
Beat the bark. On one side of the trunk, lightly tapping with a small wooden stick to relax the xylem and phloem, the plant will not die because the bark on the other side is not hit. In the short-term, the formation on the side of the tree trunk that is beaten will give birth to new skin, thickening the bark. One month later, the bark on the other side can be beaten, so that in turn, the bark can be gradually thickened so as to increase the production. This method should be carried out in the annual growth season three years before the tree felling.
Half of the skin. Half a ring is cut on the side of the tree trunk, 20 centimeters from the ground and 20 centimeters below the main branch. The ends of the upper and lower halves of the trunk are cut and connected to each other, and the bark is stripped for medicinal purposes. During operation, no stripping of the surface may be damaged or contaminated, and the stripped surface shall be covered with a film so that the stripped surface can be regenerated. This method should be carried out once every summer when the diameter of the plant reaches 10 cm to 2 years before the tree is stripped. In the third year after the first skinning, the remaining skin can be peeled off, and the first peeled skin can be peeled off in the fifth year. In this way, the skin can be recycled several times to improve economic efficiency.
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