The Journal of Horticultural Science & Biotechnology
Vol. 52 No: 2
The Effect of Truss Removal on the Yield of Early Sown Tomatoes
G. SLACK and A. CALVERT
The effect of removing individual trusses from glasshouse-grown tomatoes was investigated and the results are discussed in terms of carbohydrate source/sink relationships. Removing a truss resulted in yield increases on some of the remaining trusses both above and below the one removed, the largest increases occurring on the trusses adjacent to the removed truss with smaller increases on the more distant ones. This general pattern of yield increases occurred whichever of the first nine trusses was removed. The total yield from plants reduced to nine trusses varied from 91% to 99% of the yield from the control plants with ten trusses, depending on the position of the truss removed. The results suggest that most of the translocated material received by truss is derived from the leaves in its immediate vicinity. Also that the removal of a truss sink results in apical and basal movement of the available assimilate to the remaining trusses, perhaps via the internal and external phloem.
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