Fig. 7. Axillary bud outgrowth from extended metamers. Number of axillary shoots from U as a function of number of metamers extended during the previous year (on per branch basis). Symbols represent measured values; the treatment number is given next to the corresponding symbol. The line represents linear model fitted to the data. The slope of the line 0·41 gives the proportion of axillary bud break in spring of year 3.