POLYTHENE TUBE SIZE IN RELATION TO SEEDLING GROWTH IN THE NURSERY Mohammad Hafeez, PFS-1. Abstract: In order to standardise the size of the polythene bag and the number of perforations in it, an experiment was started in 1970 in the Research Garden, Peshawar. Different diameters, lengths, thickness of polythene were used. Miscellaneous species of Pines, Eucalyptus and Acacias were tested. On the basis of the data collected it has been found out that tube size 6 X 2.5-in c he s and 6.0 x 2.0 inches and with 45 and 36 Perforations of 1/8* dia. are the most useful ones for broad leaved and coniferous species respectively.