Blue spruce
Native to the United States, it is named for its bright silver-blue leaves. Evergreen trees, up to 15 m high, crown up to 5 m, crown conical to columnar. Bark scaly, grayish red. Branchlets strong, brownish red. Leaves 2 cm ~ 3 cm long, quadrangular, stiff, bright silver-blue-green. The cone is green at first, then light brown, 7 cm ~ 12 cm long. Bright leaf color is very decorative, mixed with other tree species, can achieve outstanding color effect. Like light, slightly resistant to overcast.
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Seedling raising technique of softwood cuttings of European spruce
European spruce is an excellent tree species introduced from northern Europe in China. The tree grows fast. Because of its straight stem shape, wide adaptability, especially strong cold resistance, it has become not only an excellent timber tree species, but also an ornamental tree species for urban greening because of its beautiful tree shape and dense evergreen branches. Due to the direct introduction of seeds, the seedling growth is slow, it takes 5 years to get out of the nursery, and a large amount of foreign exchange is needed to introduce seeds, so the development is very slow. In order to speed up the promotion of this tree species and meet the needs of rapid development of forestry construction and urban and rural greening, I
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Cultivation and afforestation techniques of Picea koraiensis
Picea koraiensis is shade-tolerant, drought-resistant, cold-resistant and fast-growing. It is not only the main tree species in the forest from Changbai Mountain to Xiaoxinganling in Northeast China, but also a common garden seedling. The cultivation and afforestation techniques of Picea koraiensis are introduced below. Breeding of improved varieties 1. Select a good stubble. Pinus sylvestris var. mongolica and larch stubble are suitable for red-bark spruce sowing land. for the bed stubble of these two kinds of trees, if the working area is small and the stubble can not be adjusted, a large amount of organic fertilizer and base fertilizer should be applied and disinfected carefully. Second, seed sprouting. Snow storage is the best treatment.
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