Citron, Polygonaceae, evergreen tree, is a green tree species with extremely high economic value. The seedlings are seedlings, but in northern Zhejiang, winter temperatures are low, and annual sowing of sweet pods is vulnerable to freezing injury. When severely frozen, they can freeze some of the shoots on the ground. Because the camphor was frozen and dehydrated, the survival rate of the transplant decreased, which affected the germination and growth of the second year, and it also caused bending of the branch. The use of a rebar stem graft method to avoid the above problems. The so-called re-trailer is to cut off the main pole at 7 to 10 cm from the rhizome. After re-cutting the poles, anti-freezing measures should be taken for the stumps. The measures are as follows: In the northern Zhejiang region, preferably in the middle or middle of December, after the citron has entered the dormancy period, the seedlings sown in the year can be re-truncated on the seedbed, leaving only 7 to 10 cm of the main pole on the ground and then used. The hoe smashes the mud between the rows and uses mud to completely pry the mast left on the ground for antifreeze. In the spring of the next year, the soil was opened and the stumps were excavated for transplantation. Cellar antifreeze. After the citron has entered the dormancy period, it can be excavated, cut off the main root, moderately trimmed the lateral roots, and immediately perform recutting on it, and then tie the stumps with ropes, 5 to 10 piles of stumps, for Cellar. The cellar should be located in a sunny place with a high topography. The cellar depth is 40-45 cm, the cellar width is about 120 cm, and the length is arbitrary. The cellar floor is placed with 5 cm thick moist sand or loose moist soil. In the cellar, the roots of each pile head are downwards and placed on the bottom of the cellar. The masts are upward and they are tied together. However, they cannot overlap. After the pile heads are completely drained, the pits can be filled with soil. , Every 100 to 120 centimeters, put a straw vertically to facilitate ventilation in the cellar; after the cellar is filled, slightly pressurize the fill, and continue to add soil until the cellar soil is higher than the surrounding soil layer 20 to 30. Centimeters ago, the mud on the cellar became a mound. After the completion of cellaring, for particularly heavy or rainy winters, cellar stumps should be regularly inspected. Several points in the pit shall be checked at the time of inspection and the soil shall be opened to check the dryness, humidity, and root conditions of the torreya in the pit. If there are any problems, appropriate measures should be taken in time. The transplanting of citrons generally takes place in mid-March of the second year. Whether it is exposed or stumped tree stumps, the root system must be trimmed at the time of transplanting, and the main roots must be cut off in winter. After the transplantation, cut the main rod 2 to 5 centimeters so that only about 5 centimeters of the main rod is exposed on the ground. After the main branch germinates, when the sprouting branch grows to about 15 centimeters, choose to leave a bud that grows most robustly, wipe out the rest of the sprouting branches, and then cut off more than 1 cm above the budding branch of the main stem. The cut should be slightly Tilt to the sprouting branch. Because of the avoidance of freezing damage and less water loss on branch stems, the transplanted scented scorpion has a higher survival rate than conventional transplanted seedlings, has early germination, rapid growth, and good growth. In northern Zhejiang, the lower the winter temperature, the better the effect of rebar cutting. In winter, where the temperature is lower than in the northern part of Zhejiang, the above measures for rebar cutting will be more effective. After being cultivated for one year, the camphor was greatly strengthened in its cold resistance. In northern Zhejiang, the two-year-old citron was generally not frozen. Even if it was chilled, its damage would be greatly reduced.
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