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墨兰钾饥饿两个月后，培养在低于１０ｍｍｏｌ／Ｌ的不同钾水平的营养液中．以比较各处理植株的生长发育、抗病和生理反应．结果表明：在正常生长状态下，墨兰体内钾含量高于氮和磷．Ｎ、Ｐ、Ｋ三者比例为６：１：９，因此栽培墨兰要重视钾肥．墨兰在缺钾（０ｍｍｏｌ／Ｌ）或低钾（０．１ｍｍｏｌ／Ｌ）条件下生长不良、花数少，叶片褐斑病较多；当供给较高钾含量（１、５或１０ｍｍｏｌ／Ｌ）时，植株生长良好，光合速率和呼吸速率亦高，根系活力较强，叶片生长快，花数多．褐斑病发病率低．作者认为，５ｍｍｏｌ／Ｌ钾水平的营养液较适合于墨兰生长发育．
After two days of starvation of cyanosis, the cells were cultured in nutrient solutions with different potassium levels below 10 mmol / L. The growth, development, disease resistance and physiological responses of all treatments were compared. The results showed that the potassium content of Cymbidium under normal growth conditions was higher than that of nitrogen and phosphorus. N, P, K three ratio of 6: 1: 9, so cultivation of Cymbidium should pay attention to potash. Cymbidium grew poorly under low potassium (0 mmol / L) or low potassium (0.1 mmol / L), with fewer flowers and more brown leaf spot. When high potassium (1,5 or 10 mmol / L ), The plants grow well, photosynthetic rate and respiration rate is also high, strong root activity, leaf growth faster, the number of flowers and more. Low incidence of brown spot. The author believes that 5mmol / L potassium level of nutrient solution is more suitable for Cymbidium growth and development.