Evaluation the effect of primary germination percentage and seed size and shape of hybrid maize (Zea mays L. Sc.704) on some seed vigor indices

In order to effect primary germination percent of seed lot and seed size and shape hybrid maize (Zea mays L.,) single cross 704 (Sc. 704) on seed vigor was carried out in seed quality analysis laboratory and research field as factorial experiment by completely randomized design and randomized complete block design respectively with four replications at Seed and Plant Certification and Registration Institute (SPCRI) in 2012. The treatments were included at three seed size and shape flat, medium and round by seed primary germination percent 88, 90 and 92%. The seed and seedling vigor were studied at the laboratory by seedling growth analysis through standard germination test and normal seedlings percent, mean daily germination, coefficient of velocity of germination, seedling length and dry weight and seedling length and weight vigor indices determined in laboratory. Also seedling field emergence percent and rate and seedling length and weight vigor indices in field measured. The results showed that seeds having various primary germination percent had significant different related to seed and seedling vigor indices. Also flat seed shape compared with round shape and medium size seeds had higher germination ability and related to seed and seedling vigor indices. In spite of this results, studied related to seedling emergence and vigor if field indices of having various primary germination percent and size and shape seeds had not significant difference but mean daily germination with seedling emergence percent and rate in field had significant positive correlation. Generally, under this experiment conditions seeds having higher primary germination percent and flat shape had seeds had more germination ability and stronger vigor.