The plants were arranged in three randomised blocks. Each block consisted of five plots with each plot being representative of a stress treatment. Each plot had 6 replicate plants with guard plants at the end of the back row and guard rows at the sides of each plot. A row was thus randomly allocated a water stress treatment and this was replicated over the other two additional blocks. Therefore there were 30 plants per block giving a total of 90 experimental plants for all 3 blocks.