Productivity and Fruit Qualities of Zaghloul Date Palm in Response to Fruits Spray with Some Nutritive and Regulative Substances

Document Type : Original Article

Authors

1 Central Laboratory for Date Palm Researches and Development, Agriculture, Research, Center, Giza, Egypt.

2 Horticulture Department, Faculty of Agriculture, Benha University.

Abstract

This study was conducted during two successive 2022 and 2023 seasons on twenty years old Zaghloul date palm trees grown in experimental the Central Laboratory for Date Palm Research and Development, Agriculture Research Center, Giza Governorate, Egypt. It was hoped to increase yield and improve fruit qualities of such desirable cultivar through investigating fruits spray 3 times yearly with(seaweed extract, glutathione and chitosan) either solely or  together at their lowest concentration, besides water spray as control. So, impact was evaluated through determining the changes exhibited in various fruiting parameters during two seasons which could be summarized as follows:
1- It was quite evident that spraying Zaghloul fruits with various seaweed extract, glutathione and chitosan solutions affected significantly all evaluated fruiting measurements than control except fruit firmness were too slight to be significant.
2- Two trends of response were detected, herein 1st declared obviously that, most desirable fruiting parameters particularly yield, bunch weight, weight of (whole fruit & flesh), flesh %, (fruit volume & its dimensions), fruit TSS % and sugars (total, reducing & non-reducing) were significantly increased over control. Effectiveness of sprayed solution varied from one substance to another and also their concentration. Anyhow combinations of 3 substances were statistically the superior, descendingly followed by glutathione at 1000 and 500 ppm.Meanwhile, algae extract solution was the least effective while chitosanwas in between.
3- trend took the other way around with fruit shape index, total acidity and  nearly tannins  or phenolic compounds.

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