Effect of plant-derived smoke on germination and seedling growth in some species weed

In order to evaluate effects of plant-derived smoke on germination and seedling growth in some species weeds an experiment was conducted in factorial based on completely randomized design at laboratory of ecology of Faculty of Agriculture, Islamic Azad University, Science and Research Branch, in 2015. First Factor was 12 weed species and second factor was germination treatment consisted of 10-3 M KNO3, 10–4 M GA3, 0.01 and 0.1 (V/V) smoke-extract dilution at constant temperature and alternating temperature. For the study species the relative effectiveness of alternating temperatures, KNO3, GA3 and smoke –extract dilution were compared on germination percentage, mean time to germination and seedling dry weight relative to the control. Results showed that smoke-extract dilution stimulated germination and seedling growth in a number of species weeds and it also had negative impacts on other species weeds. There were significant correlations between the effect of smoke-extract dilution and GA3 on the three measured parameters. None of the treatments were effective on all weed species. In addition, smoke –extract dilution appears to have no negative impact on seedling morphology, as observed with GA3, and may have wide-scale applicability as a germination and early growth stimulant. So smoke may have wide applicability as a germination and seedling growth stimulant in some species weeds.