Effect of nitrogen rates and its time of application on productivity of sugar beet under sprinkle irrigation in newly reclaimed soils
Mahmoud, E.A. | Masri, M.I.
Results obtained from this study revealed that increasing N rates from 100 up to 160 kg N/fed significantly increased root weight by 16.52% and 24.77%, number of plants at harvest by 4.05 and 2.89 thousand plants/fed and root yield by 7.22 and 8.34 tons/fed in the first and second seasons, respectively. Excessive N rate lowered beet quality in terms of sucrose content, juice purity and extractable sucrose. Extractable sugar yield increased by increasing N rates from 100 to 120 Kg/fed. Such increase amounted to 29.08 % in the first season and 31.97 % in the second one. Additional increasing in nitrogen rate beyond 120 kg N/fed had no significant effect on sugar yield. Splitting N rate into 4 equal doses significantly increased weight of individual root and number of plants/fed at harvest. Late N application in favour of N splitted into 4 doses gave the highest root yield/fed. On the other hand, early application and splitting N in two equal doses at 4-and at 8-leaf stage improved beet quality traits in terms of sucrose %, purity % and extractable sucrose %. Splitting 160 kg N/fed into 4 equal doses gave the highest root yield, while splitting 120 kg N/fed into 4 equal doses was recommended for high sugar yield/fed.
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