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Accueil du site → Doctorat → Pakistan → Studies on the Ripening Aspects and Fruit Quality of Date Palm (Phoenix dactylifera L.) Cvs. “Hillawi and Khadrawi”

University of Agriculture, Faisalabad (2015)

Studies on the Ripening Aspects and Fruit Quality of Date Palm (Phoenix dactylifera L.) Cvs. “Hillawi and Khadrawi”

HUSSAIN, IMTIAZ

Titre : Studies on the Ripening Aspects and Fruit Quality of Date Palm (Phoenix dactylifera L.) Cvs. “Hillawi and Khadrawi”

Auteur : HUSSAIN, IMTIAZ

Université de soutenance : University of Agriculture, Faisalabad

Grade : Doctor of Philosophy (PhD) 2015

Résumé partiel
Date palm is an important fruit crop in the world as well as in Pakistan. It provides a rich and quick energy source to humans and also plays a significant role in the social and economic life of the people living in dry areas. Monsoon rains at the time of fruit harvesting or ripening are very harmful and heavy fruit losses occur resulting rotting, fruit drop and uneven fruit ripening. Unfortunately, in Pakistan serious losses occur due to these rains at the time of fruit harvesting/ripening. The research work reported in this manuscript was conducted in the Experimental Fruit Orchard Square Number 9 and Post Graduate Agricultural Research Station (PARS) (Latitude 31o-26´ N, Longitude 73o-06´ E and Altitude 184.4 m), Institute of Horticultural Sciences, University of Agriculture Faisalabad, Punjab Province, Pakistan. In the field studies, effectiveness of ethephon application (foliar and injection) and strands thinning practices on ripening acceleration and fruit quality of date palm were investigated and found that ethephon application with spray showed superiority over injection method to accelerate the maturity and ripening processes of date fruits in both Hillawi and Khadrawi cultivars. Fruit sprayed with ethephon (4 ml/L and 2 ml/L) at final kimri and early khalal stages reached at rutab stage 13 and 6 days earlier and showed uniform fruit ripening indexes of 60.46 and 44.85% and rutab fruit yield (6.29 and 4.37 kg ) per bunch with good fruit quality composition than the untreated fruits. Second field experiment was conducted to explore the role of strands thinning on maturity enhancement and fruit quality. Strands thinning practices were carried out with following intensities (no thinning, 20% RCS (removal of central strands), 30% RCS, 20% STT (shortening of terminal tips), 30% STT, 20% RCS + 20% STT and 30% RCS + 30% STT) at early kimri stage (4 weeks after pollination). It was observed that strands thinning practices improved quality characteristics than the fruit those were untreated (without thinning) in both cultivars. Strands thinning intensity @ 30% RCS alone resulted in 10 days earlier maturity and higher rutab yield of 5.22 kg per bunch and more uniformly ripe fruit (76.28%) at rutab stage. The total soluble solids, ascorbic acid, sugars (glucose, fructose and sucrose), total phenolic, total flavonoids and total antioxidants were significantly improved while titratable acidity and total tannin contents were decreased in thinned fruits

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