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甜叶菊(Stevia rebaudiana Bertoni)是糖源植物,叶片中含有较多糖甙,经济价值高。通过在低丘酸性红壤研究氮磷钾对甜叶菊的营养作用,证明每100斤干叶吸收氨素5.36斤、P_2O_51.65斤、K_2O 7.63斤,三要素比例为1:0.3:1.42;甜叶菊在各生育期对养分的吸收,以现蕾期最多,营养生长期主要是氮钾,转入生育后期磷素仍然是不可缺的。其中养分大多吸自土壤,说明要获得高产,必需培肥土壤。方差分析表明,氮磷钾必需配合施用才能获得显著的增产效果。
Stevia rebaudiana Bertoni is a sugar-sourced plant with more glycosides in leaves, which is of high economic value. Through the study on the nutrient effect of N, P, K on Stevia rebaudiana in the red soils, the results showed that 5.36 kg, P_2O_51.65 kg and K_2O 7.63 kg were absorbed per 100 kg of dry leaves, the ratio of three factors was 1: 0.3: 1.42. Stevia Absorption of nutrients in each growth period, the budding period up to the vegetative growth period is mainly nitrogen and potassium, into the late growth of phosphorus is still indispensable. Most nutrients absorbed from the soil, indicating that to obtain high yield, fertilizing the soil necessary. Analysis of variance showed that nitrogen, phosphorus and potassium must be applied in order to achieve significant yield increase.