Abstract
The effect of carbohydrate sources on vegetative growth in macadamia at two major flushing times (March and September in southern hemisphere) were studied indirectly by measuring the growth rate of individual flushes in response to girdling and defoliation treatments during the vegetative growth period. Internode length and girth of a single flush were affected significantly by girdling and defoliation treatments. Two sources of carbohydrate were hypothesised for vegetative growth of the single flush; reserved carbohydrate and current photosynthate. The contribution of these sources to vegetative growth were defined and calculated from the differences between the combinations of girdling and defoliation treatments over time. Based on the results for two major flushing times, reserved carbohydrate contributes more to vegetative growth of macadamia than current photosynthesis.
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