Effect of Plant Growth Regulators on Tiller Dynamics and Yield of Sugarcane (Saccharum officinarum L.)

Abstract

A field experiment was conducted during spring 2015-16 at Pantnagar, Uttarakhand with the objective to study the effect of ethephon and gibberellic acid on tiler dynamics, millble cane production and yield of sugarcane. Ten treatments i.e. conventional planting (T 1 ), overnight soaking of setts in water (T 2 ), overnight soaking of setts in 50 ppm ethephon (T 3 ), overnight soaking of setts in 100 ppm ethephon (T 4 ), T 1 +foliar application of GA 3 @ 35 ppm at 90, 120 and 150 DAP (T 5 ), T 2 +foliar application of GA 3 @ 35 ppm at 90, 120 and 150 DAP (T 6 ), T 3 +foliar application of GA 3 @ 35 ppm at 90, 120 and 150 DAP (T 7 ), T 4 +foliar application of GA 3 @ 35 ppm at 90, 120 and 150 DAP (T 8 ), soaking of setts for six hours in 50 ppm ethephon (T 9 ) and six hour soaking of setts in 100 ppm ethephon (T 10 ) were laid down in a randomized block design with 3 replication. Soil of the experiment plot was silty clay loam having high organic carbon (1.04%), high available phosphorus (32.5 kg ha -1 ), medium in available potassium (256.2 kg ha -1 ) and low in available nitrogen (233.4 kg ha -1 ). The soil was neutral in pH (7.2). The treatment in which setts were planted after overnight soaking with 100 ppm ethephon followed by foliar application of gibberellic acid @ 35 ppm at 90, 120 and 150 DAP was found to improve tiller production, number of millable canes and yield of the crop.

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