The camphor tree is a evergreen tree, a tree species in the south, and the Jianghuai region is its natural distribution on the northern edge. In recent years, camphor trees have been used as street trees in many places, but the survival rate is low. Even the sweet leeks that have survived for more than a few years still continue to die. According to investigations and analysis, the main reason for the death of Toona sinensis is that in many places, citrons are planted from January to March. At this time, the soil temperature is low, the roots of the seedlings have not yet sprouted, and the physiological activities of the aboveground parts have already started, causing imbalance of water in the seedlings. Second, some places have a high groundwater level and are planted too deeply, causing root rot. The third is that Xiangxi hi warm and humid climate, suitable for growth in the slightly acidic soil, while the Yangtze River Valley is neutral to slightly alkaline soil, the groundwater level is high, the average winter temperature is low, are not conducive to its normal growth. Fourth, many areas of road greening blindly pursue “evergreen†and use citrons, which results in tighter prices for seedlings in the province. The units with seedlings have to go far to Zhejiang, Fujian, and Hubei Provinces to adjust their seedlings. Not only the specifications are small, but also the long distance transportation. , Seedlings lose water and have serious damage. There are no special management after planting, and no necessary pruning, thinning, moisturizing and other measures have been taken to cause the seedlings to die. If you take the following measures, the above problems can be solved. I. Selective use of citrons According to site conditions, deciduous broad-leaved trees should be used as the backbone trees in the Jianghuai area. If citrons are used, attention must be paid to the selection of sections with high topography, sheltered from the wind, and adequate illumination, and soil improvement if necessary. Second, the selection of strong seedlings, timely planting, scientific management of the breast diameter of 5 to 10 cm or more and transplanted seedlings should be as short as possible to raise the time from planting to planting. The planting season is from early April to mid-May, and appropriate shallow planting.
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