The present study was conducted at district Kom Ombo sugar cane farms, (latitude of 24 o 28 o N and longitude of 32 o 57 o E), Aswan Governorate, in the two seasons of 2015/2016 and 2016/2017 including plant cane and 1 st ratoon crops, respectively. To study the effect of harvesting age and phosphorus fertilization levels on yield and quality of some sugar cane varieties. Field experiment included twenty-seven treatments represented the combinations among three harvesting ages (10, 11 and 12 months) three phosphorus fertilization levels [30, 45 and 60 kg P 2 O 5 /fad.] and three sugar cane varieties [G.T. 54-9, G.2003-47 and G.2004-27]. Randomized complete block design with three replications laind aut in split-split plots arrangement.The results showed that all of the studied traits were significantly influenced by the harvesting ages. The three sugar cane varieties significantly differed in all studied traits. The new commercial sugar cane variety G.2003-47 showed superiority over the other varieties in brix sucrose purity cane and sugar recovery percentages. Increasing phosphorus level from 30 up to 60 kg P 2 O 5 /fad. increased significantly brix, sucrose, purity and sugar recovery percentages, while cane and sugar yield tons/fad., in plant cane crop, only.Our data suggest that farmers should attempt to harvest the majority of their crop at age of 12 months. With fertilization by 60 kg P 2 O 5 /fad. to maximize yield.
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