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This investigation was conducted during (25/9/2014 to 25/9/ 2015) at Grdarashafield/ Salahaddin University, Erbil/College of Agriculture with GPS reading ofelevation 419 m. Longitude 36.109 N Latitude 44.018 E. The interaction of seedsize, growing media and period of sampling on growth character of Pinus brutiaTen. seedling was investigated by using poly bag pots. The studied factorsincluded three seed sizes (large, medium and small), five growth media (control(field soil), control+ loamy soil, control+ compost, control+ peat moss, control+loamy soil + compost+ peat moss) and three periods (25th of March, 25th of Juneand September, 2015 ) and their interactions on germination and seedlingperformance of Pinus brutia Ten. using factorial experiment based on CRD designwith three replications. The results indicated that the seed size affected significantlyon the studied characters. The highest values of shoot diameter, shoot fresh weight,root fresh weight, shoot dry weight, root dry weight, and Quality index were (2.74,2.69, 1.73, 0.94, 0.54, and 0.25) recorded from large seed size respectively. Whilein general the period of sampling affected significantly on the seedling characters(shoot diameter, shoot length, root length, shoot fresh weight, root fresh weight,shoot dry weight, root dry weight, and Quality index). The highest values of themwere (3.13, 17.18, 68.93, 4.16, 1.98, 1.49, 0.76, and 0.29) recorded from thirdperiod respectively.On the other hand, the growth media affected significantly on most of the studiedseedling characters. The highest values of (shoot diameter, shoot fresh weight, rootfresh weight, shoot dry weight, and root dry weight) were (3.12, 16.83, 4.69, 2.26,1.55, and 0.74) recorded from media 3 respectively. Combination treatmentsamong seed size, growth media and period were also affected significantly on mostof the studied characters. The highest values of (shoot diameter, shoot length, shootfresh weight, root fresh weight, shoot dry weight, and root dry weight) were (4.11,26.50, 10.71, 4.25, 3.88, and 1.84) which recorded from combination treatment ofthird period, large seed size and media 3 respectively.

Interaction Effect of Seed Size, Growing Media and Period of Sampling on Growth Characters of Pinus brutia Ten. Seedling at Grdarasha /Erbil