EFFECT OF SOWING DATE, IRRIGATION INTERVAL AND NITROGEN FERTILIZATION ON YEILD AND QUALITY OF SUGAR BEET UNDER UPPER EGYPT CONDITIONS

Document Type : Original Article

Author

Sugar Crops Research Institute, Agricultural Research Centre Giza, Egypt

Abstract

Two field trials were carried out at Shandaweel Research Station (Sohag Governorate) in two successive growing seasons 1995/1996 and 1996/1997 to study the effect of twelve treatments which repre­sent the combination between two sowing dates (November 1st and No­vember, 15th), two irrigation intervals (7 and 14 days) and three nitro­gen levels (40, 60 and 80 Kg N/feddan) on yield and quality of sugar beet. A split-split plot design in four replications was used. The obtained results showed that non of the studied characters was significantly af­fected by the two sowing dates except top yield. Scheduling irrigation at 7-day intervals produced significantly higher root yield compared with that of 14-day intervals in the second season.lncreasing nitrogen level increased root diameter and root yield significantly, but decrease su­crose percentage significantly in the second season, thus sugar yield was not significantly increased in both seasons.