Abstract

A uniformity trial was conducted on two years old coppice plants of Eucalyptus at the Research Station of the Central Soil and Water Conservation Research and Training Institute Research Centre, Chandigarh during 1986. The plants were raised at 2 m x 2 m spacing and were given uniform cultural treatments. The data on diameter at breast height (DBH) and height of all the individual plants in 24 x 24 tree compartment were analysed to find out the optimum plot and block sizes for conducting field experiments. The CV decreased with the increase in plot size up to a plot of 8-12 trees with and without block arrangements for both the observations. The equation y = ax gave a good fit to the relationship between CV and plot size for both the observations. Compact plots showed less variability than the plots elongated in either of the direction. The number of replications and total number of the plants also indicates that a plot of 8-12 plants would be most suitable. The block efficiency decreased with an increase in block size. The shape of the block had no consistent effect.

Keywords