COLLECTION AND EVALUATION OF STEVIA (Stevia rebaudiana Bertoni.) GENOTYPES FOR GROWTH, HERBAGE YIELD AND QUALITY UNDER NORTHERN DRY ZONE OF KARNATAKA
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Date
2019-07
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University of Horticultural Sciences, Bagalkot
Abstract
The field experiment "Collection and Evaluation of Stevia (Stevia rebaudiana Bertoni.) genotypes for growth, herbage yield and quality under Northern Dry Zone of Karnataka" was conducted to evaluate nine stevia genotypes viz., CIM Madhu, CIM Mithi, Kodaikanal Local, Pune Local, Zaheerabad Local, GKVK Stevia-1, Indore Local, Hyderabad Local and Bidar Local in Randomized Complete Block Design with three replications during rabi season of 2018-19 at Main Horticultural Research and Extension Centre (MHREC), University of Horticultural Sciences, Bagalkote, Karnataka.
The results of the study revealed that, among the different genotypes evaluated, significantly higher plant height (46.02 cm), number of branches per plant (57.60), number of leaves per plant (895.43), plant spread in East-West (31.47 cm) and North-South (31.23 cm) direction and chlorophyll reading by SPAD meter (53.67) at harvest were observed in GKVK Stevia-1. The number of days taken for first flowering (21.53) and 50% flowering (26.03) were also recorded maximum in GKVK Stevia-1.
Similarly, the yield parameters such as fresh herbage yield per plant (110.08 g plant-1), dry herbage yield per plant (30.63 g plant-1), fresh herbage yield per plot (1.49 kg plot-1), dry herbage yield per plot (0.43 kg plot-1), fresh herbage yield per hectare (7.88 t ha-1) and dry herbage yield per hectare (2.27 t ha-1) were significantly higher in the genotype, GKVK Stevia-1. However, the maximum stevioside content (%) was observed in the Hyderabad Local (6.52 %) which was on par with GKVK Stevia-1 (6.48 %), Indore Local (6.45 %) and Kodaikanal Local (6.30 %) genotypes.
The study has revealed that the genotypes viz., GKVK Stevia-1, CIM Madhu, CIM Mithi and Indore Local were found promising to grow during the rabi season under protective irrigation in the Northern Dry Zone of Karnataka.