Scilight Press

The effect of plant regulators on growth, yield and yield attributes was studied for five plant regulators: thiourea @ 10 mM, salicylic acid @ 10 µM, gibberellic acid @ 25 ppm, potassium nitrate @ 15 g/l and NS (no spray i. e. control) at anthesis; 7 days after anthesis and 15 DAA under restricted irrigations. The restricted irrigations were I₁ i. e. one irrigation applied at 21 DAS and I₂ two irrigations i. e. first at 21 and 80 DAS in split-split plot design with three replications. The results revealed that gibberellic acid @ 25 ppm resulted in significantly higher plant height (106.9 cm) applied at 15 DAA under two irrigations. The other growth parameters like dry matter and number of tillers were found significantly higher (186.2 g and 99.0, respectively) when salicylic acid @ 10 µM was applied at 15 DAA under two irrigations. Salicylic acid @ 10 µM applied at 15 DAA resulted significantly in higher effective tillers (320.7/m2), number of seeds per earhead (48.0), grain yield (5225 kg/ha) and harvest index (40.4%) under two irrigations. The highest gross returns (Rs. 106462/ha), net returns (Rs. 10,749/ha) and B : C (1.11) were recorded with salicylic acid applied at 15 DAA under two irrigations with lowest cost of cultivation (Rs.95713/ha) comparable to control treatment i. e. no spray (Rs. 95711/ha). Two irrigations in wheat resulted in significantly higher gross returns (Rs. 106594/ha), net returns (Rs. 9708/ha) and highest B : C (1.10).