EFFECT OF PLANT GROWTH REGULATORS ON VEGETATIVE AND PHYSIOLOGICAL PARAMETERS OF CHINA ASTER (Callistephus chinensis L. NEES.) CV. LOCAL
Journal Title: International Journal of Agriculture Sciences - Year 2017, Vol 9, Issue 17
Abstract
A study was conducted to evaluate the effect of plant growth regulators on vegetative and physiological parameters of China aster (Callistephus chinensis L. Nees). The growth regulators used were gibberellic acid (GA3 @ 100,150 and 200 ppm), salicylic acid (SA @ 50, 100 and 150 ppm), brass inolide (BA @ 0.5, 1.0 and 1.5 ppm) and triacontanol (TR @ 1.0, 2.0 and 3.0 ppm). The growth regulators were applied as foliar sprays at two stages viz., 45 days and 60 days after transplanting and water spray as control. Application of GA3 at 150 ppm promoted the various growth and yield parameters. Spraying of GA3 at 150 ppm showed increased plant height (69.03 cm), plant spread with 37.64 cm for NS direction at 90 days after planting, number of branches plant-1 (9.25). GA3 at 150 ppm significantly increased the number of nodes plant -1 (11.47), followed by SA at 100 ppm (10.03) and number of branches plant-1 (9.25), followed by SA at 100 ppm (9.12). GA3 at 150 ppm registered significantly more number of nodes (11.47). The lowest number of nodes recorded in control was 7.27. GA3 at 150 ppm produced longer internodal length (5.57 cm) followed by SA at 100 ppm (5.25 cm).The shortest internodal length was recorded by control (1.76 cm). Leaf total chlorophyll, chlorophyll 'a' and ‘b’ contents were significantly increased by the application of GA3 at 150 ppm at flowering stage (1.58, 1.37 mg g-1, 0.83 mg g-1, 1.99) respectively, followed by SA at 100 ppm showed the chlorophyll 'a' (1.34 mg g-1), chlorophyll 'b' (0.75 mg g -1), total chlorophyll (1.53 mg g -1). The treatment GA3 at 150 ppm recorded highest chlorophyll a / b ratio (1.99) followed by SA at 100 ppm (1.98). Application of various growth regulators found significant for improving the vegetative growth and physiological parameters of China aster. Foliar application of GA3 @ 150 ppm would be effective to improve the growth and yield of China aster.
Authors and Affiliations
S. VIJAYAKUMAR, K. R. RAJADURAI, P. PANDIYARAJ, A. ELANGAIVENDAN
Keywords
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