ABSTRACT
The present paper work aimed at determinig the sample size for xperiments of Euca1iptus saligna SMITH in the tree nursery. The experiment was establisbed at Barba Negra Forest Reserve located in the production area of Riocell S.A. in Barra do Ribeiro - RS. To determine the sample size, a total of eight blocks with ninety six seedlings each block were used. The measured variables were: the plant total height and the diameter of the connecting point of root and stem easured by a millimeter graduated pachymeter. It was observed that the results obtained in the pe nursery show that the experimental design must be the block at random, using the tray as a block. The size of the ideal sample to variable diameter is the one with 26 seedlings for each tratment with significant minimum difference of 10% and nine seedlings for each treatment when e difference goes to 20%. To the height variable the size of the ideal sample is 23 seedlings with d = 10% and eight seedlings when the difference goes to 20%. It is impossible to delineate an experiment when the difference goes to 5% to both variables.
Key words:
sampling; Eucalyptus; tree nursery; designing