TY - SER AU - Silva,P.S.L.e AU - Santos,L.E.B.dos AU - Oliveira,V.R.de AU - Sousa,R.P.de AU - Fernandes,P.L.de O. TI - Sample size and sampling method for evaluation of characterĂ­stics of the sunflower KW - GIRASSOL KW - MORFOLOGIA VEGETAL KW - AMOSTRAGEM ER -