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Role of Prohexadione Calcium at Varying Concentrations and Frequencies<br />

in Reducing the Lodging in Roselle Plant (Hibiscus sabdariffa L.) and<br />

Maintaining Its Fruits Quality<br />

Nurshuhaily binti Zainisiam<br />

Supervisor: Dr. Wan Zaliha Binti Wan Sembok<br />

Bachelor of Science Agrotechnology (Postharvest Technology)<br />

School of Food Science and Technology<br />

Roselle’s lodging is a bending of the upper shoot due to heavy crops load which leads<br />

to reduction in yield. This study aimed to determine the best concentration and<br />

frequency of ProCa spray in reducing lodging and maintaining its fruit quality. Eight<br />

treatments (2 sprays with 0 mgL -1 , 2 sprays with 25 mgL -1 , 2 sprays with 50 mgL -1 , 2<br />

sprays with 75 mgL -1 , 4 sprays with 0 mgL -1 , 4 sprays with 25 mgL -1 , 4 sprays with 50<br />

mgL -1 , and 4 sprays with 75 mgL -1 ) were sprayed on roselle plants. No significant<br />

interaction was recorded between concentrations and frequencies of ProCa on the preand<br />

postharvest parameters. Although, no apparent effects were observed, all<br />

treatments include control resulted in shorter roselle branches. This may be attributed<br />

to the spray drift effect during applications. In conclusion, ProCa application at varying<br />

concentrations and spray numbers reduced lodging without affecting other fruit quality<br />

attributes.<br />

1066 | UMT UNDERGRADUATE RESEARCH DAY 2018

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