Fig. 5

The precision of estimating mean leaf thickness of the pile, based on the sampling of 5 leaves from the piles harvested in different dates. In each date, thickness of 35 leaves were measured. Then 100 virtual groups of 5 leaves were formed randomly, and mean thickness of leaves in each group was estimated based on the average of thickness values. The bars indicate the distribution of mean thickness of the 100 groups. DAS, days after sowing; μ, overall mean thickness of piles; SD, standard deviation; Difference, the difference between the averaged thickness of population and overall mean thickness estimated by sampling