Impact of Gibberellic Acid on Seed Yield of Sesame (Sesamum indicum L) Genotypes

Sesame (Sesamum indicum L.) is the fourth most important oilseed crop after rapeseed-mustard, soybean and groundnut. In West Bengal, it is cultivated during summer season and is the second most important oilseed crop. Seed, being the vital input for crop production, poor quality seed often faces problems during early growth, plant population and ultimately on seed yield. Use of growth regulators has effects on plant development and seed production. The present experiment was carried out considering four genotypes (V1: Rama, V2: Savitri, V3: Suprava, V4: Tilottama) and seven treatments viz., T1: GA3 @ 50ppm, T2: GA3 @ 100ppm, T3: GA3 @ 200ppm, T4: GA3 @ 300ppm, T5: GA3 @ 400ppm, T6: GA3 @ 500ppm, T7: Control (water spray) in split plot design with three replications. The results of the experiment revealed that, maximum number of capsule plant-1 (99.5) was observed in T2 followed by T7 (93.1) with significant variation between them. T2 (GA3 @100 ppm) had maximum seeds capsule-1 (34.75) and seed yield (1483 kg/ha) also. Among the varieties Rama (V1) produced maximum capsule plant-1 (98.5) followed by Savitri (V2). Savitri (V2) had maximum seed capsule-1 (37.38) with highest 1000 seed eight (3.36 g) and seed yield (1533 kg/ha). GA3 @ 200ppm can be used for delaying maturity. But GA3 @ 100ppm can be applied for higher seed yield in sesame.