Abstract
AbstractCombinations of gibberellic acid (GA) and 2‐methyl, 4‐chlorophenoxyacetic acid (MCPA) were applied to the foliage of greenhouse‐grown sugarcane (interspecific hybrids of Saccharum), as part of a program of screening potential ripening agents. GA induced the typical growth stimulation, lasting about 4 weeks in these trials. MCPA induced a transient growth stimulation (lasting only one week) followed by growth retardation. The coadministration of MCPA sharply curtailed the growth response to GA. Suitable combinations increased stem weights without reducing the concentration of total sugars, and induced “ripening” by causing the conversion of reducing‐sugars to sucrose. Such coadministration appears worthy of field‐testing under conditions which favor high levels of reducing‐sugars in the cane; in contrast to the probable effects of growth retardants, this mixture should not introduce any penalty of reduced weight of cane.
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