Nambiar, P.T.N.2014-07-102014-07-102007-02J.Plantn.Crops 1989 Suppl. v-16 p-489-492http://hdl.handle.net/123456789/3973The yield data of an NPK fertilizer experiment conducted at CFCRI, Kasaragod were made use of for studying the coefficients of variations of plots of different sizes and shapes, after converting to a uniformity trial data by eleminating treatment effects on the yield of individual palms. Not much variations in C.V. were observed for plots of different shapes of the same size. The C.V. decreased with the increases in plot size. Smith s Law (1938) was found to give a satisfactory fit to the underlying relationship between CV and plot size. The per unit decreases in CV were found minimum, when the plot size exceeded 8 palms/plot. With fixed experimental resources, smaller plots were found more efficient. The efficiency decreased with increase in block size.enArticle