Influence of Seed Size Grading on Physiological Parameters in Pigeon Pea cv. GRG152

The experiment was initiated during December 2020–21 and 2021–22 at seed unit, UAS, Raichur, Karnataka, India to study the influence of seed size grading on physiological parameters. For grading different round aperture sieves were used, viz., 3.50 mm, 3.75 mm, 4.00 mm, 4.25 mm, and 4.50 mm. The results revealed that the 3.75 mm sieve recorded higher seed recovery (88.60%) than other sieves with better seed quality parameters like germination (85.44%), physical purity (98.00%), 100 seed weight (10.13 g), seedling vigour index(2662), and pure live seed (83.55%). During the seed processing of Pigeon pea variety GRG 152, it is advisable to utilize 3.75 mm (R) sieves for size grading in order to enhance seed recovery while adhering to the Minimum Seed Certification Standard (MSCS) required for seed approval by the Government of India. The specified screen size can be submitted to the state seed certification agency or authority for consideration in the recommended screens for the grading of pigeon pea variety GRG152 within the seed certification program.