Studies on the sultana vine. V. Further studies on the course of bud burst with reference to time of pruning

Abstract

Further studies on the course of bud burst were made on three sites in the Sunraysia district and the effect of three times of pruning on time of bursting investigated over a period of three seasons. The largest differences in time of bursting were between seasons, with smaller differences between sites and an interaction between sites and seasons. Vines pruned on August 11 burst about 3 days later than vines pruned on June 4 or July 8. The June-pruned vines burst earlier than the July-pruned vines at bud positions 13 and 14 only. The trends of the bud position means for time of bursting, bud burst, and fruitful shoots on the one site on heavy soil differed from the other two sites on sandy soils which were very similar. The three sets of deviations appeared to be related. Data obtained on the proportion of buds producing two shoots suggested that this was positively related to nitrogen.