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细种条是指着生在榆树苗干或大树上具有繁殖能力的纤细枝条。径粗0.15至0.3厘米(如火柴棒粗)。这类枝条比较幼嫩,生长期较短,一般生长期仅有3至5个月左右。以往选用种条时都把这类枝条当废物处理。当前,在推广优良品种的生产实践中,用这些细种条做接穗培育壮苗,具有:成活多、生长快、苗木壮、操作简便等优点。获加县辛章林场几年来的经验说明,细种条的成活率可达90%以上,每年高生长可达3.5—4.5米,地径3.5厘米。那么纤细的枝条为何能培育出壮苗呢?现将细种条的生理基础和操作方法分述如下:
Seeds is the kind of slender branches that grow on elm seedlings or trees. Rough 0.15 to 0.3 cm in diameter (such as matchstick thick). These branches are relatively young, short growth period, the general growth period of only about 3 to 5 months. In the past when the selection of species of such branches when the waste treatment. At present, the promotion of fine varieties of production practice, with these fine seed sprout to cultivate strong seedlings, with: more live, fast growth, seedlings strong, easy to operate and so on. The experience of several years in Xinzhang Forest Farm in Sega County shows that the survival rate of the slender strips can reach more than 90%, and the annual growth can reach 3.5-4.5 meters and the diameter can reach 3.5 cm. Why slender branches nurturing strong seedlings it? Now the details of the physiological basis and operating methods are described below: