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Effect of para-chlorophenoxyacetic acid spray on composition and residue in boysenberries

Effect of para-chlorophenoxyacetic acid spray on composition and residue in boysenberries

J Food Sci 29(6): 744-749

A 100-ppm p-chlorophenoxyacetic acid (PCPA) spray 46 days before harvest produced boysenberries 10-15% larger and heavier than the control sample. Total yield was 9% higher for the sprayed than for the control sample. The acids, soluble solids and ascorbic-acid contents of the berries varied somewhat with date of harvest and ripeness level. A gas-liquid chromatographic method to determine PCPA as a Cl4-labeled methyl-ester can detect .05 ppm PCPA in a 100-g sample. Boysenberry plants sprayed once, 46 days before harvest, showed a residue of 0.09 ppm in the berries; whereas those sprayed twice, at 46 and 33 days before harvest, showed a residue of 0.26 ppm.

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