... was used in this study This plants was cultivated in containers of 250 cm3 (Arnabat) with an anti-spiralling system, during years Effects of shelters tubes on Juniperus thurifera L seedlings 719 ... 2001 and Oct 2001–Sept 2002, collected in the meteorological station located in the trial zone Effects of shelters tubes on Juniperus thurifera L seedlings 721 Figure Absolute maximum and minimum ... reduction of the specific foliage area, increasing the index of narrowness, morphological disproportion and poor growth, reduction of transpiration, together with the added economic cost which is incurred...