Standardization of sieve size for grading green gram (Vigna radiata L.) seeds

Green gram varieties viz. MH-421 and SML-668 were graded using various sieves on seed cleaner cum grader in order to find out the optimum sieve size for maximum seed recovery and quality seed. The seed retained over each sieve were collected separately and tested for seed quality parameters in the seed testing laboratory. The results revealed that 2.4 mm sieve size was found effective and economical for grading MH421 for maximum seed recovery (72.1%) with better seed quality i.e. germination (76%), which meets IMSCS while the sieve of 3.00 mm size was found effective and economical for grading SML-668 for maximum seed recovery (75.2%) with better seed quality i.e. germination (80%). The results also revealed that the recovery (%) increased with decrease in sieve size while the seed quality parameters increased with increase in sieve size.