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叶片的长宽比,是品评君子兰优劣的指标之一。一般认为长宽比3～4∶1者为上品,5～6∶1者为中品,比值越小越好。控制君子兰叶片长宽比的技术措施,主要是从温度、阳光、水和肥料四方面着手。笔者有两株同一品系的4年生君子兰,各方面性状基本相同,一株按普通栽培条件培养,另一株则对温度、水和肥料进行科学控制。结果两年后测定,前者同侧的9片叶,长34.0～47.8厘米,宽7.1～9.7厘米。而后者的叶片长度比它相对缩短5.6厘米,宽度相对增加0.6厘米。
The aspect ratio of leaves, is one of the indicators of the quality of Clivia. Generally believed that the aspect ratio of 3 to 4: 1 for the top grade, 5 to 6: 1 for the goods, the smaller the ratio the better. The technical measures to control the aspect ratio of Clivia are mainly from the four aspects of temperature, sunshine, water and fertilizer. The author has two 4-year-old Clivia of the same strain, with basically the same traits in all aspects. One is cultivated under ordinary cultivation conditions while the other is controlled scientifically by temperature, water and fertilizer. The results measured two years later, the former ipsilateral nine leaves, length 34.0 ~ 47.8 cm, width of 7.1 to 9.7 cm. While the latter has a shorter blade length of 5.6 cm and a relative increase of 0.6 cm in width.