EFFECTS OF ABSCISSION CHEMICAL SPRAY DEPOSITION ON MECHANICAL HARVEST EFFICACY OF 'HAMLIN' ORANGE

KOO, YOUNG M.

Abstract


An experimental abscission chemical, 5-chloro-3-methyl- 4-nitro-1H-pyrazole (Release®, CMN-P), was applied to investigate the effects of spray variables on the mechanical harvesting efficacy of a trunk shaker on 'Hamlin' orange [Citrus sinensis (L.) Osbeck] trees. Spray test variables were sprayer type, spray volume and CMN-P application rate. A Titan tower sprayer delivered higher deposition and achieved better canopy penetration compared to the conventional FMC sprayer. Generally, spray deposition was lower in the upper than in the lower canopy section and lower in the inside than in the outside canopy position. Deposition increased with a decrease of spray volume, but high spray volumes resulted in lower fruit detachment force and higher percent removal of fruit than low spray volumes. The percent removal of fruit was positively correlated with application rates of CMN-P, uniformity of deposition, fruit rind 'burn' and pre-harvest drop of fruit.

Keywords


citrus

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283