Abd Ul-Karim Al-Hmmad(1) Bahaa ALRahban*(2) and Isood Al-Mihaymeed(1)
(1). Department of Plant Protection, Faculty of Agriculture, Al-Furat University , Der Ezzur, Syria.
(2). Plant Protection Administration, General Commission for Scientific Agricultural Research GCSAR, Damascus, Syria.
(*Corresponding author: Dr. Bahaa AlRahban. E-Mail: bahaarahban@gmail.com).
Received: 28/07/2016 Accepted: 31/08/2016
Abstract
The experiment was conducted on sugar beet crop, using Cawyinterpoly new, a multigerm cultivar, during the fall season of 2013\2014 at Halta village in Der- Ezzur governorate. Betanal expert herbicide, (75g/L Phenmedipham+25 g/L Desmedipham+ 151g/L Ethofumesat) was used as post-emergence treatment with an average of 2 L/ha for one application, manual weeding control for three times and non-weeded as a check. Phosphorus and potassium fertilizers were added by two ways: (1st) whole quantities were added before planting; (2nd) the quantities were divided and added in three times: one third before planting, one third after thinning, and one third after a month from thinning, besides the check without fertilization .The experiment was laid according to split plot design with three replicates. Broad-leaved weeds were dominated. Results showed that manually weeded treatment effectiveness was (100%), sugar yield (6.53 ton/ha ) and root yield (46.72 ton/ha) while Betanal expert herbicide treatment effectiveness resulted (89.78%, 6.27 ton/ha and 44.39 ton/ha) respectively. The un-weeded treatment surpassed significantly Betanal expert and manual weeding treatments in root sugar contents (17.18%), whereas there were no significant differences between manual weeding and Betanal expert herbicide in this trait. Splitting the quantity of fertilizer into three increased root yield (41.11 ton/ha) significantly as compared with adding the whole quantity before planting (38.56 ton/ha). However, there were no significant differences in sugar yield in terms of fertilizer methods. With respect of sugar content, adding whole quantity of fertilizer before planting gave higher root sugar content (16.67%) significantly compared with splitting the fertilizer to three (16.39%). The interaction between fertilization and weed control treatments affected only root sugar content significantly.
Key words: Sugar beet, Herbicide, Fertilization.
Full paper in Arabic: PDF