جستجوی مقالات مرتبط با کلیدواژه "درصد قند" در نشریات گروه "مکانیزاسیون کشاورزی"

One of the significant limitations in autumn cultivation of sugar beet is bolting. To investigate the quantitative and qualitative traits of root sugar beet cultivars and their resistance to bolting, a two-year (2018-2020) experiment was conducted as a randomized complete blocks design with three replications at Varsan Agricultural Research Station of Golestan Agricultural and Natural Resources Research and Education Center, Gorgan- Iran. Treatments included commercial autumn sugar beet cultivars [five imported cultivars (Montana, Jerra-kws, Rosagold, Chemineh, and Veles) and a domestic cultivar (Sharif). There was a significant difference in bolting rates of all cultivars in both years. Veles and Sharif cultivars had the highest bolting rate (41.7% and 33.3%) in both years, respectively. The bolting rate was higher in the second than in the first year. There was a significant difference between cultivars for root yield only in 2019. The highest (85.2 t ha-1) and lowest (59.8 t ha-1) root yields were obtained from Jerra-kws Chamine cultivars. There was a significant difference between cultivars for sugar purity, sugar extraction coefficient, and molasses sugar percentage in the second year. There was no significant difference between cultivars for sugar content and harmful nitrogen in both years. The cultivars showed different reactions in terms of bolting rate and other root qualitative traits (pure sugar, extraction coefficient, sodium, potassium, and harmful nitrogen levels) in the two years.

Several herbicides are registered for selective weed control in sugar beet; however, no single chemical herbicide can control all weeds in beet fields. Frequently, two or more herbicides may have to be combined sequentially or as tank mixed to achieve adequate broad-spectrum weed control. In order to evaluate the effects of some combinations of broadleaf herbicides on sugar beet yield and quality, a field experiment was conducted in randomized complete block design with three replications at Miandoaab Agricultural Research Station during 2009-2010 growing season. The results showed that weed competition decreased root yield up to 84%. The maximum root yield (73.66 tha-1) was obtained from 4.5 kgha-1metamitron application at 2-to 4-leaf stage and the minimum root yield was obtained in the control (20.66tha-1). The herbicide treatments had a significant effect on white sugar content so that the highest white sugar yield was achieved from bettanal Progress Am herbicide (10.9 tha-1) and the lowest white sugar yield was found in control treatment (1.49 tha-1). The lowest sodium, potassium, amino-nitrogen as well as molasses content were obtained from phenmedipham desmedipham ethofumesate and the highest value for the above parameters was observed in control treatment. Generally, weed competition led to decreasing root yield and sugar content and treatment bettanal Progress Am herbicide was recommended to control broadleaf weeds.