This study was conducted to determine a suitable time and temperature combination for the electrical conductivity test to be used in sorghum seeds. Fifty seeds known initial seed moisture content and weight of fresh and dead seeds (105°C for 6h) of seven sorghum cultivars were used as material. The electrical conductivities of soaking water were measured using an EC meter in 20, 25 and 30°C for 4, 8, 12 and 24 h using 50 mL deionized water. The experimental design was three factor factorial (7 × 3 × 4) arranged in a completely randomized design; with four replications and 50 seeds per replicate. The results showed that increased time and temperature caused a remarkable increase in EC values of all of the cultivars. Temperature significantly affected the electrical conductivity values and the best results were obtained at 25°C. The cultivars with the lower germination percentage gave the higher electrical conductivity value. Dead seeds always gave higher electrical conductivity at 25°C for all periods. It was concluded that the temperature of 25°C and 24 h was the optimum combination for the electrical conductivity test in sorghum.
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Asgharipour MR, Heidari M. 2011. Effect of potassium supply on drought resistance in sorghum: Plant growth and macronutrient content. Pakistan Journal of Agricultural Science, 48: 197-204.
Cisse ND, Ejeta G. 2003. Genetic variation and relationships among seedling vigor traits in sorghum. Crop Science, 43: 824-828.
Doggett H. 1988. Sorghum. 2nd Ed. John Wiley and Sons Inc. New York.
Hampton JG, Tekrony DM. 1995. Handbook of vigour test methods. 3rd Ed. International Seed Testing Association, Zurich. ISTA 2003. Handbook on seedling evaluation. 3rd Ed. International Seed Testing Association, Zurich.
Mutavaa RN, Prasada PVV, Tuinstrab MR, Kofoidc KD, Yua LJ. 2011. Characterization of sorghum genotypes for traits related to drought tolerance. Field Crops Research, 123: 10-18.
Milosevic M, Vujakovic M, Karagic D. 2010. Vigour tests as indicators of seed viability. Genetika, 42: 103-118.
Panobianco M, Vieira RD, Perecin D. 2007. Electrical conductivity as an indicator of pea seed aging of stored at different temperatures. Scientia Agricola, 64: 119-124.
Santipracha W, Santipracha Q, Wongvarodom V. 1997. Hybrid corn seed quality and accelerated aging. Seed Science and Technology, 25: 203-208.
Soares MM, Conceicao PM, Dias DCFS, Alvarenga EM. 2010. Vigor tests in sorghum seeds with emphasis to electrical conductivity. Ciência Agrotechnica, 34: 391-397.
Vieira RD, Paiva A, Perecien DJA. 1999. Electrical conductivity and field performance of soybean seeds. Seed Technology, 21: 15- 24.