ABSTRACT
A field experiment was carried out at Malawi Research Station, El-
Minia governorate (latitude 28.10 o N, longitude 30.75 o E and altitude of
55 m above sea level) Egypt in 2016/2017 and 2017/2018 seasons to
evaluate the performance yield and quality of four multi-germ sugar beet
varieties namely (Dina, Belatos, Athos poly and Sirona) under three
harvesting dates being (180, 195 and 210) days from sowing. A splitplot
design with three replications was used in both seasons.
The results showed that harvesting sugar beet after 210 days from
sowing was the proper dates to obtain the highest root and foliage fresh
weights /plant, sucrose, extractable sugar percentages, quality index, root
and sugar yields/fed in both seasons. Compared to the other two dates
(180 and 195) days from sowing.
Sowing Sirona variety led to an increase in root and sugar
yields/fed than that recorded by Dina, Belatos and Athos poly varieties in
the 1st and 2nd season, respectively. On the other hand, the highest
values impurities (sodium and alpha-amino N contents) of Belatos and
Athos poly were recorded by Dina variety which attained the lower
values of potassium and sugar lost to molasses %.
Delaying harvesting Sirona variety up to 210 days recorded the
highest values of sucrose; extractable sugar percentages, root and sugar
yield/fed in both seasons. Harvesting Belatos and Athos poly varieties at
180 and 195 days achieved the highest values of impurities (sodium,
potassium and alpha-amino N contents) and sugar lost to molasses% in
both seasons.