Effects of Seed Size Variation on Germination and Seeding Vigour of Sorghum (Sorghum bicolor L.)
2012
Jung, K.Y., National Institute of Crop Science, RDA, Milyang, Republic of Korea | Yun, E.S., National Institute of Crop Science, RDA, Milyang, Republic of Korea | Park, C.Y., National Institute of Crop Science, RDA, Milyang, Republic of Korea | Choi, Y.D., National Institute of Crop Science, RDA, Milyang, Republic of Korea | Hwang, J.B., National Institute of Crop Science, RDA, Milyang, Republic of Korea | Jeon, S.H., National Institute of Crop Science, RDA, Milyang, Republic of Korea
Seed size has been considered as an effective criteria for selection of the most vigorous seeds in sorghum [(Sorghum bicolor (L) Moench]. The smaller seeds were inferior to the larger sizes in emergence and grain yield. This study was conducted to determine germination rate, field emergence and vigor of sorghum for selection of high quality seed by different seed size. Sorghum cultivar of two (Hwanggeumchal and Tojong) were separated into five seed size proportion (less than 2.36, 2.80, 3.15, 3.35 and greater than 3.55 mm diam.) according to seed size. The larger seed was more higher 1,000 seeds weight, seed density, carbohydrates and protein content. Total seed germination performing varied 92% at the largest size (greater than 3.55 mm diam.) frequently inferior to slightly 67% at smaller seed (2.36 to 2.80 mm diam.) in the standard germination test. Seed size did have a significant effect on mean emergence time (MET) and maximum emergence rate index (ERI) and percentage of emergence. It should be noted that the results refer to MET of sorghum seeds ranging from 4.26 to 4.74 days. The relationship of seed size was not only to stand establishment but to grain yield. Yield was most affected by seed size and large seeds were superior to the smaller seed in 25~37% of the cases. Especially, yield was significant under 3.15 mm the beginning.
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