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甜菊原产于南美洲的巴拉圭等低纬度地区,属于短日照作物,在我省长日照的条件下,不能正常开花结实。为使我省甜菊生产种子自给,几年来我们用短日照处理方法,成功地进行了甜菊繁种。繁种方法如下:1.短日照处理时期与方法:一般在7月上旬(辽北最迟不得晚于7月15日),当甜菊植株出现15对真叶前后进行遮光处理。处理的方法是,每天午后5～6时用农用黑色塑料布或其它遮光物遮光,在次日早晨7时揭去遮光物,使甜菊植株每天见阳光10～11小时,到现蕾时停止遮光处理。遮光前最好每亩地追施复合肥料20～30斤。在遮光处理时,无论采取什么样的遮光材料,都要遮掩严密。从开始遮光到停止遮光约需15～20天,现蕾后10～15天即可开花。甜菊是喜湿作物,应经常保持田间土壤湿润,尤其是现营开花期,更要及时灌水。
Stevia originated in South America, Paraguay and other low latitudes, belonging to short-day crops, in my governor under the conditions of sunshine, not normal flowering and fruiting. In order to make our province stevia self-sufficient seed production, the past few years we use short-day treatment methods, the success of stevia breed. Breeding methods are as follows: 1. Short-term treatment period and method: usually in early July (Liaoning late no later than July 15), when the stevia plants appear 15 true leaves before and after shading treatment. The treatment method is that every day from 5 to 6 pm with agricultural black plastic sheeting or other shading light shading at 7 am the next morning to remove the shading, so that stevia plants see the sun for 10 to 11 hours a day, when the bud to stop shading deal with. Shade before the best per acre topdressing compound fertilizer 20 to 30 pounds. In the shading treatment, no matter what kind of shading materials, should be kept tight. From the beginning of shading to stop shading takes about 15 to 20 days, 10 to 15 days after budding can flowering. Stevia is a wet plant, should always keep the soil moist, especially in the current business flowering, but also to timely irrigation.