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Gibberellin application and potash fertilizer on yield and quality of 'White Malaga' grape
- Amkha, S., Saengkai, K., Rungcharoenthong, P.
- Acta horticulturae 2018 no.1206 pp. 51-56
- fertilizers, foliar application, gibberellins, grapes, potassium, soil drenching, total soluble solids
- The effect of gibberellins (GA3) with potash fertilizer (0-0-60) was investigated for increasing yield and quality of 'White Malaga' grapes. This study was divided into two experiments. The first experiment was to find out the effect of GA3 concentration on yield and quality of 'White Malaga' grapes. Experimental was completely randomized design (CRD) with 4 replications and 5 treatments which include: control (non-GA3), GA3 30 mg L-1, GA3 50 mg L-1, GA3 70 mg L-1 and GA3 70 mg L-1 (commercial grade). The second experiment investigated the effect of GA3 and 0-0-60 fertilizer on yield and quality of 'White Malaga' grapes. The design of the experiment was similar to the first but with 4 replications and 7 treatments which include: control (non-GA3 and 0-0-60 fertilizer), GA3+100% foliar of 0-0-60 fertilizer, GA3+50% foliar and 50% soil drench of 0-0-60 fertilizer, GA3+100% soil drench of 0-0-60 fertilizer, 100% foliar of 0-0-60 fertilizer and 100% soil drench of 0-0-60 fertilizer. The study evaluated length of cluster, diameter of rachis, length of berry, diameter of berry, weight of cluster and total soluble solid. In the first experiment, the results showed that high concentration of GA3 application increased diameter of rachis, length of berry, and diameter of berry compared to the control. GA3 application observed a remarkably higher total soluble solid content than non-GA3 application. GA3 at a rate 50 mg L-1 seemingly increased yield as indicated by cluster length. In addition, potash fertilizer foliar application improved yield and total soluble solid. On the other hand, GA3 and potassium application by soil drench had a maximum yield and total soluble solid. Summarily, GA3 application and potash fertilizer had a positive effect on yield and quality of 'White Malaga' grapes.