An experiment testing 9 different herbicides applied for weed control in garl ic crop (Allium sativum L.) was used in order to define the sampling technique. The following four sampling methods were compared through the Discriminant Function: 1) X1 - sample of 0,30m x 0,30m size located at the central part of the plot; 2) X2 - sample of 0,30m x 0,90m locted at the ce ntra l thi rd part of the plot (X1 is in cluded in X2); 3) X3 - sample of 0,30 x 1,50m also locted at the central third part of the plo t (X2 is included in X3); 4) X4 - three samples of the same siz e of X1 with diagonal disposition(X1 is included in x4). The following conclusions were obtained: 1) Sampling representing 4,5% of the plot area was enough for e valuat ing the herbicides efficiency on dicotyledonous weeds; 2) for the monocotiledon class the sampling area should be 22,5% of the plot.
Sampling areas; herbicides; trials; weeds