EFFECT OF ANION VARIATIONS IN A NUTRIENT SOLUTION ON BASIL GROWTH, ESSENTIAL OIL CONTENT, AND COMPOSITION
The object of this study is to determine which anions increase the essential oil production in basil plant, Ocimum basilicum L. Plants were grown in containers for hydroponic culture in a glass-house. In the first experiment, dominant anion, such as NO3-, H2PO4, and SO42-, was kept at the level of 60% of total anion concentration in the nutrient solution of each treatment and the others were kept at 20%. In the second experiment of inverse variations, two anions were taken at the level of 40% and the other was kept at the level of 20% as a recessive anion concentration. Weight growth and essential oil yield of individual plant in the dominant NO3- -plot were the greatest and those in the dominant H2PO4- -plot came second. Of the essential oils, linalool and 1,8-cineol were highly increased, although eugenol was the dominant essential oil. From these data, the optimum ratio of NO3-: H2PO4- SO42- in a nutrient solution was estimated as 47:32:21% of total anion concentration. In inverse variations, yield of essential oil per plant was high in the plots at the low level of phosphate or sulfate. The optimum ratio of NO3-:H2PO4-:SO4- in a nutrient solution for the higher yield of essential oils was calculated as 49:26:25% of total anion concentration.
The relationships between essential oil content and percentage dry matter, or nutrient content were also discussed.
Takano, T. and Yamamoto, A. (1996). EFFECT OF ANION VARIATIONS IN A NUTRIENT SOLUTION ON BASIL GROWTH, ESSENTIAL OIL CONTENT, AND COMPOSITION. Acta Hortic. 426, 389-396