BIOMASS PRODUCTION, YIELD AND QUALITY IN COLEUS (PLECTRANTHUS BARBATUSBRIQ.) AS INFLUENCED BY IRRIGATION AND NUTRIENT SCHEDULEY. S. PRANEETH, A. P. MALLIKARJUNA GOWDA., M. N. THIMMEGOWDA, K. UMESHA AND T.N. RANJINIAbstract A field experiment was conducted for standardization of irrigation and nutrient schedule for drip fertigation in coleus (Plectranthus barbatus Briq.) at College of Horticulture, UHS Campus, GKVK (Po), Bengaluru. The experiment was laid in factorial concept in randomized block design (RBD) with three replications. Treatments comprised of a combination of drip irrigation regimes, viz., 0.9, 0.7 and 0.5 IW/CPE ratio and fertigation schedules up to 4 months, fertigation up to 5 months, and with soil application as per recommended dosage. Among drip irrigation regimes, irrigation at 0.7 IW/CPE recorded maximum fresh weight of leaves (725.7g), dry weight of leaves (172.8g), fresh weight of tubers per plant (395.89g), dry weight of tubers per plant (51.48g), fresh tuber yield (32.99 t ha-1) and moisture per cent (6.69%). The total forskolin content was maximum with 0.5 IW/CPE ratio (0.86%). Among fertigation schedule, highest fresh weight of leaves (734.3g), dry weight of leaves (174.8g), fresh weight of stem (1870.3g), dry weight of stem (301.6g), fresh weight of tubers per plant (398.77g), dry weight of tubers per plant (53.01g), fresh tuber yield (33.23t ha-1), dry tuber yield (4.42 t/ha) and forskolin yield (37.57 ha-1 kg) was registered with fertigation up to 5 months.
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