THE ECONOMICS EFFECT FOR SOME OPERATING OF FRUIT THINNING AND BUNCH COVERING TREATMENTS ON "SEWI CV." DATE PALM Productivity in Siwa Oasis الاثر الاقتصادی لبعض معاملات الخف و التغطیة للسباطات على إنتاجیة أصناف البلح فی واحة سیوه

‘Piyarom’ dates are one of the most important commercial date cultivars grown in Iran but fruit quality and postharvest losses can be a problem. Thinning and the use of bunch covers were examined to improve the date fruit quality. Three different levels of fruit thinning were applied (without thinning, removal of one third of total strands from terminal tips during pollination and removal of one third of terminal tips of central strands in early kimri). In addition, the effects of bunch covers were assessed with the use of polyethylene bunch covers that were applied in the early stages of Khalal. The results showed that bunch covering reduced the lightness of the fruit but increased bunch weight, fruit length, total antioxidant activity and total phenolic compounds compared to the control. Thinning during pollination increased the weight of the fruit compared to the control. The thinning during Kimri stage increased the percentage of Tamar and ascorbic acid content. These results show that the use of covers play a positive role in increasing quality and bunch weight and thinning at both pollination and Kimri ripening stage is recommended to produce high quality ‘Piyarom’ dates.

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Studies on the Improvement of Date Palm Productivity Using Different Methods of Pollination and Fruit Thinning Levels

Journal of Plant Production ◽

10.21608/jpp.2019.36270 ◽

2019 ◽

Vol 10 (4) ◽

pp. 373-377

Author(s):

Mokhtar Shaaban ◽

E. Ahmed ◽

M. El-Akkad

Keyword(s):

Date Palm ◽

Fruit Thinning

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Impact of Chemical and Non-Chemical Thinning Treatments on Yield and Fruit Quality of Date Palm

Journal of Food Research ◽

10.5539/jfr.v4n4p18 ◽

2015 ◽

Vol 4 (4) ◽

pp. 18

Author(s):

Mohamed S. Al Saikhan ◽

Abdel-Kader A. Sallam

Keyword(s):

Fruit Quality ◽

Date Palm ◽

Fruit Set ◽

Block Design ◽

The Other ◽

Alternate Bearing ◽

High Quality ◽

Fruit Thinning ◽

Thinning Process

<p>The fruit thinning process is employed for the production of high quality large-sized fruits and prevent the production of compact bunches. It is also one way to reduce the alternate bearing habits in date palm. In this study, seven thinning treatments (i.e. without spraying water after pollination, spraying water at 3 minutes after 3, 4 and 5 h, spraying Ethephon at 0, 500 and 1000 ppm after ten days from pollination) are used for Khalas and Ruzeiz date palm cultivars. The factorial experiment in a randomized completely block design with three replicates was done. The results reveal that, spraying water after mechanical pollination has reduced fruit set% and increased fruit shees%. Most thinning treatments reduced fruit yield/palm in both Khalas and Ruzeiz. Spraying water after 5 h enhanced fruit quality compared with the other thinning treatments in besr and tamr stages. Spraying with ethephon at 1000 ppm gave the increased sugars content and TSS, whereas reduced the moisture content in besr stage. Spraying water after 5 h from mechanical pollination or Ethephon at 1000 ppm after 10 days are suitable for obtaining economic yield with best fruit quality.</p>

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IMPACT OF CHEMICAL THINNING TO IMPROVE FRUIT CHARACTERISTICS OF DATE PALM CULTIVAR KHALAS

IRAQI JOURNAL OF AGRICULTURAL SCIENCES ◽

10.36103/ijas.v50i5.802 ◽

2019 ◽

Vol 50 (5) ◽

Author(s):

Ghazzawy & et al.

Keyword(s):

Date Palm ◽

Block Design ◽

Quality Parameters ◽

Fruit Weight ◽

Fruit Yield ◽

Early Application ◽

Palm Fruit ◽

Time Of Application ◽

Fruit Thinning ◽

Yield And Quality

A field study was conducted to observe the effects of chemical fruit thinning and their time of application on fruit yield and quality of date palm cv. Khalas at Date Palm Research Center of Excellence, King Faisal University, Saudi Arabia. Fourteen date palm trees were randomly selected for the experiment, which was laid out on two-factorial randomized complete block design having six replicates for each treatment. Factor-one comprised of the six chemical (ammonium thiosulphate at 1, 2, and 3% and ethephon at 100, 200 and 300ppm) excluding control, whereas the second factor was the time of application of these two chemical thinners (5 and 10 days after pollination). The findings of this study indicated that the chemical fruit thinning had definite effects on virtually all fruit quality characteristics. Early application of chemical thinners after 5 days of pollination, significantly decreased the total fruits drop percentage and enhanced number of retained fruits, bunch weight, yield per palm, fruit color, fruit weight and length, seed weight, TSS, total and reducing sugars. On the other hand, among chemical thinners, the application of ethephon at 300 ppm significantly improved previously mentioned parameters. Similarly, ethephon at 200 or ATS at 3% also showed promising results. It is therefore, concluded that the application of ethephon at 200 or 300ppm after 5 days of pollination influenced significantly regarding fruit yield and quality parameters of date palm cv. Khalas.

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