Vol. 12, Issue 6 (2023)

The soil of experimental plot was vertisol, it was low in available nitrogen (172.35 kg ha^-1) and organic carbon (0.37), medium in phosphorus (16.50 kg ha^-1), rich in available potassium (335.30 kg ha^-1) and slightly alkaline in reaction (7.7). The cotton seed was sown at 90 x 30 cm spacing with 60:30:30 NPK kg/ha. The main plot treatments were two i.e. V₁: PDKV JKAL-116 and V₂: AKH-9-5 (Suvarna shubhra) and sub plot treatments were four i.e. B₁: Bio stimulant (Anacardic acid) @4 mg litre^-1 at 30, 45 and 60 DAS (20 mg+5 litre of water + 0.5 ml of DMSO), B₂: Bio stimulant (Anacardic acid) @ 4 mg litre^-1 at 45, 60 and 75 DAS (20 mg+5 litre of water + 0.5 ml of DMSO), B₃: DMSO @ 100 µl litre^-1 spray at 30, 45, 60 and 75 DAS (0.5 ml of DMSO+ 5 litre of water) and B₄: Control (water spray 30, 45, 60 and 75). Growth characters viz., plant height, number of functional leaves, number of monopodial and sympodial branches, dry matter accumulation, leaf area and chlorophyll content was significantly highest with genotype V₁: PDKV JKAL-116 Bt (BG-II) fallowed by V₂: AKH-9-5 (Suvarna shubhra). Yield attributes and seed yield (kg ha^-1) viz., number of bolls picked plant^-1, average boll weight (g), seed cotton yield plant^-1 (kg ha^-1) were recorded maximum in genotype V₁: PDKV JKAL-116 Bt (BG-II). The seed cotton yield was significantly highest in V₁: PDKV JKAL-116 Bt (BG-II) (2275 kg ha^-1) followed by V₂: AKH-9-5 (Suvarna shubhra). Same trend was observed in lint yield kg ha^-1, stalk yield kg ha^-1 and harvest index. The seed cotton yield was significantly highest in genotype V₁: PDKV JKAL-116 Bt (BG-II) (2275 kg ha^-1) followed by V₂: AKH-9-5 (Suvarna shubhra) (1725 kg ha^-1). Total nutrient content viz., nitrogen, phosphorous and potassium in seed and stalk were observed maximum by means of genotype V₁: PDKV JKAL-116 Bt (BG-II) followed by V2: AKH-9-5 (Suvarna shubhra). Similar trend was observed in available nitrogen, phosphorous and potassium. The significant difference were observed at to harvest, the growth characters viz., plant height, number of functional leaves, monopodial and sympodial branches, and dry matter accumulation content was significantly highest in treatment B₁: Anacardic acid @ 4 mg litre^-1 at 30, 45 and 60 DAS. However it was at par with B₂: Anacardic acid @ 4 mg litre^-1 at 45, 60 and 75 DAS. The seed cotton yield was significantly highest in treatment B₁: Anacardic acid @ 4 mg litre^-1 at 30,45 and 60 DAS (2256 kg ha^-1) which was at par with B₂: Anacardic acid @ 4 mg litre^-1 at 45, 60 and 75 DAS (2068 kg ha^-1). Same trend was observed in lint yield kg ha^-1, stalk yield kg ha^-1 and harvest index. Total nutrient content viz., nitrogen, phosphorous and potassium in plant and available NPK in soil were observed maximum by means of B₁: Anacardic acid @ 4 mg litre^-1 at 30, 45 and 60 DAS which was at par with B₂: Anacardic acid @ 4 mg litre^-1 at 45, 60 and 75 DAS (2068 kg ha^-1). Same trend was observed in total nitrogen, total phosphorous and total potassium which were maximum with B₁: Anacardic acid @ 4 mg litre^-1 at 30, 45 and 60 DAS and superior over B₃: DMSO 100 µl litre^-1 at 30, 45, 60 and 75 DAS and B₄: Water spray at 30, 45, 60 and 75 DAS. Interaction effect of genotypes and application of different bio stimulant were found to be non-significant in respect of all parameter except yield. Quality parameters viz., fibre finess, micronaire value and uniformity index was not significantly influenced by genotype and bio stimulant spray.