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In the present studies investigation were conducted on sunflower hybrid varieties to study the influence of seed size (large, medium and small) on germination and seedling vigour. The germination potential and seedling vigour was significantly more in the large and medium size than the ungraded and smaller ones respectively. First count germination, plumule and radicle length, speed of germination, dry matter production and seed vigour index positively correlated with seed size. The optimum sieve for grading the seeds of these varieties have been fixed. The seed technological aspects encompassing these aspects are yet to be investigated. The findings of the present studies would benefit the farmer in obtaining superior crop.

EFFECT OF SEED SIZE AND SHAPE ON GERMINATION AND SEEDLINGVIGOUR IN HYBRID VARIETIES OF SUNFLOWER