METHODS FOR RAPID DETERMINATION OF SPECIFIC GRAVITY OF SINGLE SEEDS AND SEED SAMPLES AND THE CORRELATION OF SPECIFIC GRAVITY WITH OIL CONTENT

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Abstract
The specific gravities of seed of 14 safflower varieties were determined by three methods and correlated with oil percentages. Displacing a weighed quantity of seed in. water or mercury proved to be an accurate method of determining the specific gravity of seed samples. However, displacement in mercury is a more rapid method. The specific gravity of individual seeds or seed particles was determined rapidly with a density gradient tube but this method was not practical with large seed samples.A correlation coefficient of r = − 0.91 (P < 0.01) was obtained between specific gravity and oil content of safflower embryos. The correlation coefficients between specific gravity and oil percentage in flax seed, rapeseed, and dehulled sunflowers were −0.90, −0.84, and −0.90 (P < 0.01), respectively.

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