지베렐린 엽면살포가 ‘궁천조생’ 감귤의 착화와 과실품질에 미치는 영향
Effect of Foliar Application of GA3 on the Flower Bud Formation and Fruit Quality of Satsuma Mandarine (C. unshiu Marc. cv. Miyagawa)
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BACKGROUND: Control of alternate bearing satsumamandarin in Jeju is very important to maintain the optimumprice of fruit and get the sustainable income of farmers. Unlike orange, Satsuma mandarin is well known to sensitiveon alternate bearing. We carried out the experiment to knowthe effect of foliar application of GA3 on the flowering andfruit quality of satsuma mandarin (C. unshiu Marc. cv. Miyagawa). METHODS AND RESULTS: To experiment, thetreatments consist of control, different concentration ofGA3 (25, 50 and 100 mg/L), machine oil emulsion 100 timesand mixture of various concentration of GA3 (25 and 50mg/L) with machine oil emulsion 100 times which it wasapplied on 15 year-old Miyagawa satsuma mandarin atDecember 29, 2011. Foliar application of GA3 in winterreduced the flowering of satsuma mandarin. Flower-leafratio was significantly reduced at 100 mg/L GA3, while nodifferences observed in low concentration of GA3 (25 and50 mg/L). However, it was significantly decreased to 0.19in application of GA3 25 and 50 mg/L with machine oilemulsion 100 times mixture. Number of leaves per fruit wassignificantly increased as foliar application of GA3 also itreduced the fruits remarkably. Soluble solid contents andHunter’s a of peel color ratio showed no difference amongGA3 single treatments, but it was reduced in GA3 25 and 50mg/L with machine oil emulsion 100 times mixturessignificantly. From the results, it has been found that higherGA3 concentration can reduce the number of flowers on thealternate bearing of satsuma mandarin. However, it wasfound that lower concentration of GA3 with machine oilemulsion mixture 100 times can reduce flowering. CONCLUSION(S): The foliar application of GA3 (100mg/L) can alleviate alternate beraring. Also, mixture oflower concentration of GA3 with machine oil emulsion 100times can retard flowering more significantly while it needsfurther confirmation.
Abstract
BACKGROUND: Control of alternate bearing satsumamandarin in Jeju is very important to maintain the optimumprice of fruit and get the sustainable income of farmers. Unlike orange, Satsuma mandarin is well known to sensitiveon alternate bearing. We carried out the experiment to knowthe effect of foliar application of GA3 on the flowering andfruit quality of satsuma mandarin (C. unshiu Marc. cv. Miyagawa). METHODS AND RESULTS: To experiment, thetreatments consist of control, different concentration ofGA3 (25, 50 and 100 mg/L), machine oil emulsion 100 timesand mixture of various concentration of GA3 (25 and 50mg/L) with machine oil emulsion 100 times which it wasapplied on 15 year-old Miyagawa satsuma mandarin atDecember 29, 2011. Foliar application of GA3 in winterreduced the flowering of satsuma mandarin. Flower-leafratio was significantly reduced at 100 mg/L GA3, while nodifferences observed in low concentration of GA3 (25 and50 mg/L). However, it was significantly decreased to 0.19in application of GA3 25 and 50 mg/L with machine oilemulsion 100 times mixture. Number of leaves per fruit wassignificantly increased as foliar application of GA3 also itreduced the fruits remarkably. Soluble solid contents andHunter’s a of peel color ratio showed no difference amongGA3 single treatments, but it was reduced in GA3 25 and 50mg/L with machine oil emulsion 100 times mixturessignificantly. From the results, it has been found that higherGA3 concentration can reduce the number of flowers on thealternate bearing of satsuma mandarin. However, it wasfound that lower concentration of GA3 with machine oilemulsion mixture 100 times can reduce flowering. CONCLUSION(S): The foliar application of GA3 (100mg/L) can alleviate alternate beraring. Also, mixture oflower concentration of GA3 with machine oil emulsion 100times can retard flowering more significantly while it needsfurther confirmation.
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