Show trees now anticipate A much longer li life f e city treed treei red may soon be enjoying beenjoylne enjoyino enjo yino loncer longer and healthier lives th answer to growing trees successfully in areas covered with pavement is not a new wonder drug but a new type of porous asphalt being tried out in providence it R 1 I it is hoped this type of asphalt will prove to be a covering that will withstand toot foot traffic and still allow ample water to get through to the roots of the trees the experiments deal with trees planted in the paved pedestrian islands of a parking area in providence th the new porous asphalt being used as paving allows 80 per cent of the rainfall to percolate into the ground over the whole surface of the island walka walks this bin der course mixture of st tone one and sand send combined with asphalt obtained after considerable testing allows 500 cc of water to go through a five inch ring ot of the mixture in 8 5 seconds the per percolation coja Is 1 equivalent to a rainfall of nearly 15 13 inches the piNes pedestrian pinestrian trian islands islanis which house the trees are dished 41 shed to retain water Reen recently itly when hoses were turned on them not a drop ot of water ran an over the curbs because it was absorbed as fast as it streamed onto the surface of the asphalt I 1 few cities have had success success in in planting and growing trees in paved areas because they cannot provide lovide rovide adequate open ground around pround around the bases of the trees watering just around the trunk is not enough to provide the necessary moisture for the trees fingerling ends it is hoped this new paving plan will get to the root of the problem by providing tor for pedestrian traffic as well as insuring adequate moisture for the trees |