Vol. 9, Special Issue 8, Part I (2025)

A field experiment was conducted during the kharif 2024 at Soybean Research Station, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani. To study the “Screening and Response of Growth Regulators SA, ABA and CCC on morpho-physiological and yield parameters of soybean (Glycine max L. Merrill)”. The investigation was carried out in Randomized Block Design with three replications in soybean cv. MAUS-725 was sown on 1^st July 2024 by dibbling seeds in 45 cm between rows and 5 cm between plant spacing. The gross plot size was 2.70 m x 5.0 m and Net plot size was 2.25 m x 5 m. The experiment consisting of ten treatments viz., T₁, T₂ and T₃ (SA @ 50 ppm, 100 ppm and 200 ppm), T₄, T₅ and T₆ (ABA @ 2 ppm, 4 ppm and 8 ppm), T₇, T₈ and T₉ (CCC @ 200 ppm, 300 ppm and 400 ppm) respectively and T₀ (control), applied application of Plant growth regulators at 30 and 60 Days After Sowing (DAS).

The experimental results revealed that the application of various plant growth regulators had a significant influence on morpho-physiological and yield parameters all of which exhibited noticeable variation in response to the different treatments application of SA, ABA and CCC as compare to control in soybean. The application of plant growth regulators positively influenced plant height, days to 50% Flowering, days to maturity it was higher in treatment T₃ (SA @ 200 ppm) treated plants.

The photosynthetic productivity and partitioning of photosynthate finally lead to increases yield of soybean. The highest values for the number of pods/plant (68.70), seed yield/plot (3.16 Kg), 100-seed weight (16.02 g), biological yield (6182.64 Kg/ha) and harvest index (45.43%) was recorded under treatment T₃ (SA @ 200 ppm) at harvest. Significantly maximum seed yield/ha (2808.86 kg/ha) was also achieved treatment T₃ (SA @ 200 ppm).