بررسی و تعیین اثرات ارتفاع محل پیوند و نوع پایه در میزان سرمازدگی احتمالی پرتقال تامسون ناول

In order to preventation radiational frost damage after snowing in Norh of Iran (Caspian sea) and different effect of hieghts in microclaimate as spelet plots design is done.5tratement of hieght ,10, 20, 30 ,40,50 cm for budding as sub plot and three rootstocks as main plot in four replications were assaimed. The result show that citromello is the best one in vegetative growth ,poncirous in fruit set.The frost damage in 7 years show that because of no snwing in Ramsar we haven,t any damage unless in second year on citrange and 10,20 cm.The effects of radiation frost damage in 1379 and Astara,the second place show thatin 10 and 20 cm height and citrange had the most damages as death of trees.