Variation in root yield and ephedrine content of Bala (Sida cordifolia Linn.) at differential harvesting under open and shaded situation

A. Latha, V.V. Radhakrishnan


A field experiment was conducted under rainfed condition to study the effect of light intensity on yield and quality of Sida cordifolia and to find out the optimum stage of harvest of Sida cordifolia for higher root yield and quality. The experiment was laid out in randomized block design with three replications. There were nine treatments comprising of stages of harvest from six months after planting to fourteen months after planting at monthly intervals. The experiment on stage of harvest was repeated under direct sunlight and shaded situation to study the effect of shade. Observations on growth characters, yield attributes, fresh and dry yields were recorded. The ephedrine content of the root was estimated by HPLC analysis. The results indicated that vigorous plants and higher fresh and dry root yields were observed under open compared to shaded situation. Under shaded situation, higher root yield was noticed at fourteen months after planting and the yield was very low compared to that under open situation. With respect to ephedrine yield also, higher yield was noticed at hundred per cent sunlight. The maximum root yield and ephedrine content were recorded at eight months after planting and further delay in harvesting showed a sharp decline in both root yield and ephedrine content. The results indicated Sida cordiflia,/i> preferred open condition for higher root yield and ephedrine content and the optimum stage of harvest is eight months after planting.


Sida cordifolia, Stage of harvest, Dry root yield, Ephedrine content, Open, Shade

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A KAU publication [CODEN: JTAGEI; ISSN 0971-636X; eISSN 0973-5399]