El-Dengawy, E., Abul-soad, A., EL-Attar, A. (2019). Impact of Thinning Bunches and Spraying Calcium Nitrate and Gibberellic Acid on Set, Drop, Yield and Quality of Fruits in Hayany Date Palm. Journal of Plant Production, 10(10), 815-821. doi: 10.21608/jpp.2019.60381
E. F. A. El-Dengawy; A. A. Abul-soad; A. N. A. EL-Attar. "Impact of Thinning Bunches and Spraying Calcium Nitrate and Gibberellic Acid on Set, Drop, Yield and Quality of Fruits in Hayany Date Palm". Journal of Plant Production, 10, 10, 2019, 815-821. doi: 10.21608/jpp.2019.60381
El-Dengawy, E., Abul-soad, A., EL-Attar, A. (2019). 'Impact of Thinning Bunches and Spraying Calcium Nitrate and Gibberellic Acid on Set, Drop, Yield and Quality of Fruits in Hayany Date Palm', Journal of Plant Production, 10(10), pp. 815-821. doi: 10.21608/jpp.2019.60381
El-Dengawy, E., Abul-soad, A., EL-Attar, A. Impact of Thinning Bunches and Spraying Calcium Nitrate and Gibberellic Acid on Set, Drop, Yield and Quality of Fruits in Hayany Date Palm. Journal of Plant Production, 2019; 10(10): 815-821. doi: 10.21608/jpp.2019.60381
Impact of Thinning Bunches and Spraying Calcium Nitrate and Gibberellic Acid on Set, Drop, Yield and Quality of Fruits in Hayany Date Palm
1Pomology Department, Faculty of Agriculture, Damietta University, Egypt
2Tropical Fruit Research Department, Horticulture Research Institute, Agricultural Research Center, Egypt
Abstract
This research was conducted during 2015 and 2016 growing seasons on Hayany Cv. date palms growing on sandy soil in a private orchard in the governorate of Damietta, Egypt, to assess the effect of thinning bunch and spraying with calcium nitrate and gibberellic acid on fruit set, drop percentage, productivity and fruit quality. Bunch thinning was carried out by leaving 7, 9 and 11 bunch\palm and removing the overload. Each thinning treatment was then subjected to spraying 2500ppm calcium nitrate alone or combined with gibberellic acid at 150 ppm as well as without spraying (control). The results cleared that the thinning treatments by retaining 7, 9 and 11 bunch / palm with calcium nitrate spraying at 2500 ppm alone or followed by spraying with gibberellic acid at 150 ppm led to increasing the percentage of fruit set, yield / palm and decreasing the percentage of fruit drop compared to the control (Retention 7, 9 or 11 with water spray). Also the yield were increased with increasing number of bunches/palm from 7 to 11bunches/palm in the first season and the treatment of thinning at 11 bunch / palm with calcium nitrate and gibberellic acid spray gave the highest yield / palm compared to other treatments. While the thinning procedure by leaving 11 bunch / palm led to a decrease in palm yield in the second season compared to other thinning treatments. The palms subjected to combination treatment involved 7 bunch/palm and Ca(No3)2 + GA3 gave the best physical properties parameters (fruit weight, flesh weight, fruit size, fruit length and fruit diameter) compared to other treatments. The date fruits of the same treatment got the best values in most chemical characters such as SSC%, total sugar and percentage of calcium, whilst the ratio of acidity and total tannins decreased significantly.
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