ﺗﺎﺛﻴﺮ ﺗﻴﻤﺎر ﻣﺪت زﻣﺎن و ﻏﻠﻈﺖ اﺳﻴﺪﺳﻮﻟﻔﻮرﻳﻚ(95% ) ﺑﺮ ﻛﺮک زداﻳﻲ، ﺗﻮان ﺟﻮاﻧﻪ زﻧﻲ و ﻗﺪرت روﻳﺶ ﭘﻨﺒﻪرﻗﻢ وراﻣﻴﻦ (Gossypium hirsutum L)

This investigation was conducted to evaluate the effects of the sulfuric acid on seed germination of cotton seed, under time condition. The design of the experiment was a factorial completely randomized design (CRD) with three replications. The experimental factors were cotton seeds under twenty levels of sulfuric acid (5, 10, 15, 20, 25, 30, 65, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 96) Percent and five levels of time treatment (1,5, 10, 15 and 20) minute. At the first stage cotton seeds were immersed in one level of sulfuric acid treatment for up to times at room temperature. Then the seeds were distilled by water for 24 h at 30 °C and subjected to water for two week. The results showed that sulfuric acid technique had a significant effect (p<% 1) on seedling parameters including: dry weight of seedlings, length of radicles and plumules, rate and period of germination Mean Germination Time, Germination of Coefficient, Variance of Mean Germination Time, Uniformity of Mean Germination Time and Seed Vigour Index. The upper levels of sulfuric acid had more inhibition effect on plumula growth than the lower levels of sulfuric acid.