Effect of Storage at -20 C° on Physical and Mechanical Properties and Their Relation with Sugar Content and Type of Date Palm Fruits (Khlass Variety) in Rutab Stage from Al-Hassa Area- Saudi Arabia

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Changes in physical and mechanical properties, type and content of sugars of date palm Khlass Varity at rutab stage during storage at -20 C° for 2, 5, 8 and 11 months were studied. The results showed significance fluctuate changes in the values of the determined parameters during storage> Force, hardness and penetration coefficient varied from 0.266 to 0.653N , 0.775 to 2.884 N/mm, and 0.136 to 0.517 N/mm respectively during storage fruits at -20C°. The highest and lowest values of hardness, cohesiveness, adhesion, chewiness, elasticity and resilience were 2.119N. in fresh fruits and 1.639 N
after 5 months of storage, 0.728 after 8 months and 0.592 after 2 months of storage, 0.658 after 5 months and 0.509 after 11 months of storage, 0.942 after 8 months and 0.571 after 5 months of storage, 0.738 after 8 months and 0.607 after 5 months of storage, 0.227 in fresh fruit and 0.11after 8 months storage at -20C° respectively. Total and reducing sugars especially glucose and fructose contents were gradually increased with extending storage period at -20C° for 11 months. The obtained resulted indicated the suitable storage period of this species of date at rutab stage is 2 months at -20C°.        
 
 
 

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