Quality Of Beet Research Articles

EFFECT OF MINERAL AND BIO-FERTILIZATION ON YIELD, YIELD COMPONENTS AND QUALITY TRAITS OF SUGAR BEET PLANTS

Two field experiments were carried out at the AgriculturalResearch Farm of Delta Sugar Company at El-Hamol, Kafr El-SheikhGovernorate during two winter seasons of 2008/2009 and 2009/2010to study the effect of mineral and bio-fertilization on yield and itscomponents and quality of sugar beet plants. A split plot in stripedesign with four replications was used, where nitrogen fertilizertreatments were occupied in the main plots and the bio-fertilizer (soilor spray) treatments were distributed in the sub-units (in thehorizontal strips). The results could be summarized as follows:- Increasing nitrogen fertilizer significantly increased the yield and itscomponents traits, while the quality traits were decreased.- The highest values for yield and its components traits were foundeither with yeast treatment or by using the mixture of macro &micro spray treatment with amino acid treatment in the first or inthe second season.- The highest values of sugar beet quality traits were recorded byhumic acid or by the effective microorganism treatment.- Generally, the significant highest values of yield and its componentstraits either by using yeast treatment or by using the mixture ofmacro & micro treatment with amino acid treatment together with120 kg N/fed. While the quality traits had the highest values byusing the mixture of macro & micro treatment with amino acidtreatment or by using the yeast treatment under 80 kg N/fed.treatment.

Sugar beet (Beta vulgaris L.) storage quality in large outdoor piles is impacted by pile management but not by nitrogen fertilizer or cultivar

Van Eerd, L. L., Congreves, K. A. and Zandstra, J. W. 2012. Sugar beet (Beta vulgarisL.) storage quality in large outdoor piles is impacted by pile management but not by nitrogen fertilizer or cultivar. Can. J. Plant Sci. 92: 129–139. Even though storage results in lower sucrose recovery from sugar beets, physical constraints dictate that a significant proportion of the sugar beet crop can be stored up to 120 d before processing. From 2006 to 2010, N fertilization (0–220 kg N ha–1), sugar beet cultivar, and pile management method were independently evaluated to determine their effects on sugar beet storability in large outdoor piles. At harvest, five representative sugar beet samples from the N and cultivar field trials were placed in a large outdoor storage pile. Sugar beet quality assessments were taken at harvest and three times over the storage season. On the last retrieval date only, sugar beet samples were retrieved from piles managed via the length- vs. end-removal method. Although there were differences among N treatments and cultivars in sugar beet quality at harvest, there were no storage date by N treatment or storage date by cultivar interactions for any parameters measured indicating that N fertilization or cultivar did not influence the ability to maintain sugar beet quality in large outdoor piles. The length-removal method of pile management had better quality sugar beets compared with the standard end-removal method. Hence, sugar beet producers do not need to modify production practices to optimize storability, but sugar beet processors can improve sucrose recovery by removing sugar beets lengthwise along both sides of large piles as opposed to the standard end-removal method.

EFFECT OF APPLICATION OF ZINC ON YIELD AND QUALITY AND NUTRIENT UPTAKE OF SUGAR BEET (Beta vulgaris L.)

The experiment was conducted at two locations (Aridisols and Entisols at Ninevah province) to study the effect of three levels of zinc ( 0 , 5 , 10 ) mg Zn .L-1 sprayed to the leaves of sugar beet and their interaction on the growth , nutrients uptake and quantity and quality of sugar beet (Beta vulgaris L.),by using randomized complete block design (R.C.B.D) with three replicates.The results of this study showed that the use of higher levels sprayed with zinc caused a significant effect on yield quantity by increasing the total yield , yield per plant, weight per one root , and qualitatively (perx , sugar percentage , purity , raw sugar, pure sugar). Higher response to fertilizer (Zn) application was found in the soil of compared Aridisols soil with Entisols soil , in the root yield quantity and quality (by increasing the total yield , sugar percentage, and sugar yield of sugar beet) .Also the fertilizer efficiency and inter needed of the elements were higher in Aridisols soil when compared with Entisols soil of at all levels of added Zinc fertilizers.

Effect of Time and Concentration of Boron Foliar Application on Yield and Quality of Sugar Beet

A field experiment was carried out at the Research Center of Barkat-e-Jovein, Jovein agro-industries, Northeastern Iran, during 2008 to evaluate the effect of concentration and time of boron foliar application on root yield and quality of sugar beet (Beta vulgaris). Treatments consisted of 3 application times (30, 45 and 60 DAP) and 4 application rates (spraying with concentrations of 0, 4, 8 and 12‰ corresponding with 0, 0.35, 0.70 and 1.22 kg B ha as water-soluble B (Boric acid)). Results revealed that application time had no considerable 1 effect on sucrose concentration, root yield, k , Na , molasses sugar, nor on reducing nitrogen. Boron ++ application increased root yield and sucrose concentration by 12.12% and 26.35%, respectively, decreasing k , + Na , -amino-N and molasses sugar compared with those of the control. In this study, no significant differences +

Mineral nitrogen dynamics in soil during sugar beet and winter wheat crop growth

Nitrogen (N) is the crop nutrient which most directly influences the production and quality of sugar beet ( Beta vulgaris subsp. vulgaris L., SB) root. It is therefore important to accurately estimate the amount of N to be supplied to the crop. Past research has focused on predicting the amount of N available at the beginning of the growth season, whereas the amount of N in soil during crop growth is less considered. The aim of this work was to improve our knowledge of N availability for SB during the crop growth season, by monitoring the mineral N content in the cultivated soil layer in the spring-early summer period. The N dynamics in soil under rain-fed SB was compared to that under winter wheat ( Triticum aestivum L., WW). Three experiments were carried out in three locations of the Po Valley, North Eastern Italy, on silty clay (San Prospero, Modena, 2004), silty clay loam (Rovigo, 2006), and loam (Bovolone, Verona, 2008) soils. The experimental design was a strip-plot, with crops (SB, WW) in the main plots and three N rates in the sub-plots (0, 40 and 80 kg N ha −1 for SB and 80, 120 and 200 kg N ha −1 for WW, at San Prospero; 0, 60 and 120 kg N ha −1 for both crops, at Rovigo and Bovolone). Increasing N rates did not influence crop N removal, or only slightly increased it. In the period of simultaneous crop growth, in the three locations, the mean mineral N content of the soil samples under SB was on average more than twice that under WW, even though crop N removal by SB was on average higher than that of WW (more than twice, at Rovigo, and up to three times, at Bovolone). Our results suggest that N recommendations should be formulated by taking into account, besides the usually considered N balance terms, the soil N availability linked to specific crop management and growth patterns.

Improving Yield and Quality of Sugar Beet Using Boron at Different Levels of Nitrogen Fertilizer

Improving Yield and Quality of Sugar Beet Using Boron at Different Levels of Nitrogen Fertilizer

Influence of sugar end syrup pH value on overall color rise in the sugar end and color of final molasses

Where chromatographic separation of sucrose from molasses produced is employed, the color of the molasses feed to the molasses separator operation has a relatively large effect on the color of the sucrose enriched extract produced from the separation process and, as a result, on the overall efficiency of sugar recovery from the molasses separation process. The subsequent sugar end processing efficiency of the separator sucrose enriched extract product to granulated sugar is quite dependent on the color loading of the extract being processed. This study evaluates the effect of manipulating and controlling the pH value of the A (high green) run-off syrup, B (intermediate) green run-off syrup and final molasses produced to achieve minimal color rise and a low final molasses color from the thick juice processed in the sugar end. The deliberate and precise control of green syrup pH value will produce molasses of the desired color relative to the quality of the beets being processed and the thick juice produced from such beet quality. It is further shown that the color of extract produced is highly dependent on the color of molasses feed to the molasses separation operation.

Importance of cultivar and harvest date on the yield and processing quality of sugar beet

The results assessed from sugar beet microtrials at Kljajicevo (Serbia) in 2010 harvested at three harvest periods demonstrated that the average root yield tended to increase from the first to the third harvest period. The average increase in root yield between the first and the second harvest period was 29.06 t ha-1 or 32.76%, between the second and the third period 14.77 t ha-1 or 12.54% and between the first and the third period 43.83 t ha-1 or 49.40%. In average, the content of sugar in root showed a similar tendency. The highest increase in this parameter was registered between the second and the third harvest period and it amounted to 1.00% abs. Other indicators of sugar beet processing quality showed a slow increase or slight decrease depending on the harvest date, probably due to plentiful rainfall in September. Mean granulated sugar yield had an increasing tendency: 3.413 t ha-1 or 32.82% between the first and the second harvest period, 2.820 t ha-1 or 20.42% between the second and the third and 6.233 t ha-1 or 59.94% between the first and the third period.

Yield and quality of sugar beet crown as well as leaf yieldof different sugar beet varieties and a fodder beet

Since sugar beet varieties differ in beet yield and quality, varieties may exist which are more profitable for a harvest including the crown because of a larger crown with a better quality compared to other varieties. In 2009 and 2010 field trials with 8 sugar beet varieties and one fodder beet were conducted at 4 sites, and additionally a field trial with N application from 0, 100, 200, and 300 kg N ha–1. At harvest the crown was removed manually below the green leaf scares, root and crown were analyzed separately. The results show that yield and quality of the crown have not changed in relation to the root during the breeding progress. Differences among varieties in yield and quality continue in the crown. Varieties can, therefore, be chosen according to the known variety characteristics also when the crown is harvested. For the use in the fermentation process the incorporation of the crown will result in yield increase which is similar for all varieties. There were only little differences in leaf dry matter and similar root to leaf ratios for the sugar beet varieties. Increasing N application caused an increase of the amino N and sodium concentration, which was more pronounced in the crown than in the root. The concentration of invert sugar, raffinose, betaine and glutamine was higher in the crown than in the root. However, changes were similar for all varieties. The effect of these changes in quality on the sugar recovery process can only be studied in processing experiments.

Considerations of the technological quality assessment of sugarbeet

No real improvement in the technological quality of beet has been recorded over the last 15 years in Northern Italy. Among the possible explanations for the quality stagnation is that the traditional formulae cannot correctly differentiate between sugarbeet varieties which produce thick juice of very high purity. This seems to be connected with the role of potassium. The use of a standard purification procedure gives reliable and accurate data which is immediately comparable with the factory data. Research projects on medium/long term storage are currently being performed by Co.Pro.B., Italy, in cooperation with Syngenta and Beta. Up to now the results have shown that storage of sugarbeet in autumn time in northern Italy is possible provided that suitable varieties and proper handling of the roots are employed. Results obtained in the storage trials are reported. Correlations have been found between quality parameters (purity, color and lime salts) of the purified juice with the glucose content of the raw juice. An interesting correlation is reported between purified juice purity and raw juice purity.

Effect of different drip irrigation regimes on sugar beet (Beta vulgaris L.) yield, quality and water use efficiency in Middle Anatolian, Turkey

Agricultural production has forced researchers to focus on increasing water use efficiency by improving either new drought-tolerant plant varieties or water management for arid and semi-arid areas under water shortage conditions. A field study was conducted to determine effects of seasonal deficit irrigation on plant root yield, quality and water use efficiency (WUE) of sugar beet for a 2-year period in the semi-arid region. Irrigations were applied when approximately 50–55% of the usable soil moisture was consumed in the effective rooting depth at the full irrigation (FI) treatment. In deficit irrigation treatments, irrigations were applied at the rates of 75, 50 and 25% of full irrigation treatment on the same day. Irrigation water was applied by a drip irrigation system. Increasing water deficits resulted in a relatively lower root and white sugar yields. The linear relationship between evapotranspiration and root yield was obtained. Similarly, WUE was the highest in DI25 irrigation conditions and the lowest in full irrigation conditions. According to the averaged values of 2 years, yield response factor (ky) was 0.93 for sugar beet. Sugar beet root quality parameters were influenced by drip irrigation levels in both years. The results revealed that irrigation of sugar beet with drip irrigation method at 75% level (DI25) had significant benefits in terms of saved irrigation water and large WUE, indicating a definitive advantage of deficit irrigation under limited water supply conditions. In an economic viewpoint, 25% saving of irrigation water (DI25) caused 6.1% reduction in the net income.

Effect of free air carbon dioxide enrichment combined with two nitrogen levels on growth, yield and yield quality of sugar beet: Evidence for a sink limitation of beet growth under elevated CO 2

The increase in atmospheric CO 2 concentration [CO 2] has been demonstrated to stimulate the growth of C 3 crops. However, little information exists about the effect of elevated [CO 2] on biomass production of sugar beet, and data from field experiments are lacking. In this study, sugar beet was grown within a crop rotation over two rotation cycles (2001, 2004) at present and elevated [CO 2] (375 μl l −1 and 550 μl l −1) in a free air CO 2 enrichment (FACE) system and at two levels of nitrogen supply [high (N2), and 50% of high (N1)], in Braunschweig, Germany. The objective of the present study was to determine the CO 2 effect on seasonal changes of leaf growth and on final biomass and sugar yield. Shading treatment was included to test whether sugar beet growth is sink limited under elevated [CO 2]. CO 2 elevation did not affect leaf number but increased individual leaf size in early summer resulting in a faster row closure under both N levels. In late summer CO 2 enrichment increased the fraction of senescent leaves under high but not low N supply, which contributed to a negative CO 2 effect on leaf area index and canopy chlorophyll content under high N at final harvest. Petioles contained up to 40% water-soluble carbohydrates, which were hardly affected by CO 2 but increased by N supply. More N increased biomass production by 21% and 12% in 2001 and 2004, respectively, while beet and sugar yield was not influenced. Concentration of α-amino N in the beet fresh weight was increased under low N and decreased under high N by CO 2 enrichment. The CO 2 response of total biomass, beet yield and white sugar yield was unaffected by N supply. Averaged over both N levels elevated [CO 2] increased total biomass by 7% and 12% in 2001 and 2004, respectively, and white sugar yield by 12% and 13%. The shading treatment in 2004 prevented the decrease in leaf area index under elevated [CO 2] and high N in September. Moreover, the CO 2 effect on total biomass (24%) and white sugar yield (28%) was doubled as compared to the unshaded conditions. It is concluded that the growth of the storage root of sugar beet is not source but sink limited under elevated [CO 2], which minimizes the potential CO 2 effect on photosynthesis and beet yield.

Potassium substitution by sodium in sugar beet (Beta vulgaris) nutrition on K‐fixing soils

AbstractAlluvial soils with illite and vermiculite clay minerals are highly potassium (K)‐fixing. Such soils have been reported to require a huge amount of K fertilization for optimum plant growth. For halophytic plants such as sugar beet, sodium (Na) can be an alternative to K under such conditions. This study was conducted to investigate the possible substitution of K by Na fertilization with reference to K‐fixing soils. Three soils, i.e., Kleinlinden (subsoil), Giessen (alluvial), and Trebur (alluvial), differing in K‐fixing capacities, were selected, and sugar beet plants were grown in Ahr pots with 15 kg soil pot–1. Three treatments (no K and Na, K equal to K‐fixing capacity of soil, and Na equivalent to regular K fertilization) were applied. In a second experiment, containers (90 cm × 40 cm × 40 cm) were used with 170 kg Kleinlinden soil each, and one sugar beet plant per container was grown. In both experiments, plants were grown till beet maturity, and beets were analyzed for sucrose concentration and other quality parameters such as α‐amino nitrogen to calculate white‐sugar yield with the New Brunswick formula. The results showed that growth and quality of sugar beet were not affected by Na application, and ultimately there was no decrease in white‐sugar yield. Moreover, the soils with more K‐fixing capacity were more suitable for K substitution by Na. It is concluded that Na can substitute K in sugar beet nutrition to a high degree and soils with high K‐fixing capacity have more potential for this substitution.

Human Urine and Wood Ash as Plant Nutrients for Red Beet (Beta vulgaris) Cultivation: Impacts on Yield Quality

The objective of this study was to evaluate the effect of human urine and wood ash fertilization on the yield and quality of red beet by measuring the microbial, nutrient, and antioxidant (betanin) content of the roots. Red beets were fertilized with 133 kg of N/ha as mineral fertilizer, urine and ash, and only urine with no fertilizer as a control. The mineral-fertilized plants and urine- and ash-fertilized plants also received 89 kg of P/ha. Urine and ash and only urine fertilizer produced 1720 and 656 kg/ha more root biomass, respectively, versus what was obtained from the mineral fertilizer. Few fecal coliforms and coliphage were detected in mineral-fertilized and urine- and ash-fertilized red beet roots. The protein and betanin contents in red beet roots were similar in all treatments. In conclusion, this study revealed that urine with or without ash can increase the yield of red beet and furthermore the microbial quality and chemical quality were similar to the situation in mineral-fertilized products.

Long-term storability of different sugarbeet genotypes – Results of a joint IIRB study

In 2008/09 and 2009/10, storage trials with 12 sugarbeet genotypes were carried out under different conditions in six countries. The genotypes were grown in strips and harvested in September/November either by machine (using good agricultural practice) or by hand. Samples were then stored either in nets incorporated in clamps or in separate nets/bags or containers inside a barn or climate room. All samples were weighed and analyzed before and after storage for sugar (by polarimetry), potassium, sodium, amino nitrogen, total soluble nitrogen, sucrose, glucose, fructose, raffinose, betaine and glutamine content. After storage the samples were also examined visually. Differences between the genotypes were observed for root tip breakage, sprouting, moulds and rot, although these differences were not unambiguous in all experiments and varied between the observations in the different countries. The sugar losses ranged from 0 to 66% of the initial amount and seemed to be related to various biotic and abiotic factors. Root damage by machine harvest and storage temperature were dominant factors in relation to the sugar losses. Genotypes also showed significant differences in sugar losses, but a strong interaction with year and site existed. Correlations could be found between sugar losses and initial sugar content (r = –0.66), initial betaine content (r = –0.62) and root tip breakage (r = +0.66) and after storage, moulds (r = +0.87), rot (r = +0.88) and invert sugars (r = +0.89). Chemical analyses showed differences between the genotypes for the decrease in beet quality after storage, not only by a reduction in sugar content but also by an increase in invert sugar and soluble nitrogen.

Response of Two Sugar Beet Varieties to Chicken Manure and Phosphorine Application

The present study was conducted to investigate the effect of chicken manure at zero, 10 and 20 ton/fed.rates and biofertilization (phosphate dissolving bacteria PDB (Bacillus megaterium var. phosphaticum inoculation)) on growth, chemical composition, yield and sugar quality of two sugar beet varieties ('Lados' and 'T WS 1436'). The experiment was carried out at South Tahrir Region – El-Behira during the two successive growing winter seasons of 2006/2007 and 2007/2008. The experimental design used was a split split plot with four replicates. All data showed that Lados gave the highly significant difference compared to TWS 1436 in all growth attributes and sugar beet quality parameters except for purity%, Na% and extractable sucrose%. Also, the results showed that with increasing chicken manure rates from control to 10 and 20 ton/fed. , the means of growth attributes and sugar beet quality parameters tended to increase significantly at the different sample dates in both seasons, except T.S.S.% and A.C. which were reduced significantly in both seasons. All growth attributes values at the different sample dates in both seasons were increased significantly by inoculation with phosphate dissolving bacteria. On the other hand, there was no significant difference in extractable sucrose%, A.C. and µ-amino-N between both varieties with and without PDB inoculation. In contrast, K, Na and T.S.S. percentages were decreased significantly with inoculation by PDB. In each plant varieties, the response of sugar beet plants without PDB to the increasing of chicken manure (OM) application was vigorous and highly significant. On the other hand, the sugar beet plants inoculated with the PDB had a slight difference and not significant at different OM rates in both varieties. In general, the bacteria have a significant effect when an organic matter level was very low. It can be concluded that inoculation with phosphate dissolving bacteria singly or application of chicken manure singly or combination of them had significantly increased all sugar beet growth attributes and quality parameters under the same conditions of this experiment. Also, Lados variety produced higher sugar beet growth attributes and quality parameters compared to the other variety TWS 1436

Vesicular-arbuscular mycorrhiza and Trichoderma virdi as deterrents against soil-borne root rot disease of sugar beet

The aim of the present work was to study the effects of vesicular-arbuscular mycorrhiza (VAM) and Trichoderma virdi (T. virdi) fungi as deterrents against Rhizoctonia solani (R. solani) and Fusarium solani (F. solani) infections on the growth and quality of sugar beet. Two experiments were carried out in the greenhouse at the Agriculture Research Center, Giza, Egypt, under greenhouse conditions. The results showed that mycorrhizal and T. virdi inoculation significantly restricted the spread of both soil-borne pathogens in the host root tissues. Disease incidence of sugar beet roots was reduced to 6.2 and 5.2% for mycorrhiza with Rhizoctonia and 5 and 4.5% with Fusarium in the 1st and 2nd seasons respectively. Trichoderma with Rhizoctonia inoculation reduced disease incidence to 6.0 and 5.8% and with Fusarium to 5 and 4.3% in the 1st and 2nd seasons, respectively, compared to pathogen (Rhizoctonia and/or Fusarium) alone. In the first and second seasons, respectively, incidence of R. solani infection, in combination with mycorrhiza treatment, was reduced to 6.2 and 5.2%, and to 5 and 4.5% when amended with F. solani. Dual inoculation with mycorrhizal or T. virdi and the pathogen resulted in increasing total fresh and dry weight, nitrogen (N), phosphorus (K) and potassium (P) contents of sugar beet leaves and roots compared to pathogen-inoculated plants. Furthermore, the same treatments increased yield and quality traits of sugar beet (sucrose, total soluble solids and purity percentage). The use of this microbial model system in biological suppression of R. solani and F. solani will sustain the productivity of sugarbeet.

EFFECT OF NITROGEN RATES AND ITS TIME OF APPLICATION ON PRODUCTIVITY OF SUGAR BEET UNDER SPRINKLE IRRIGATION IN NEWLY RECLAIMED SOILS

Two field experiments were conducted at Sedment El-Gabal location, Beni-Sweif Governorate during 2007/2009 seasons to study the response of sugar beet yield and some of its attributes under sprinkle irrigation to different N rates; 100, 120, 140 and 160 kg N/fed and its time of application viz., split application in two equal doses, at 4- and at 8-leaf stage, or in three equal doses,1/3 at 4- leaf stage, 1/3 at 8-leaf stage and 1/3 three weeks later, or dividing the rate into 4 equal doses and added 1/4 at 4- leaf stages, 1/4 at 8- leaf stage, 1/4 three weeks later and 1/4 three weeks after the last. A split plot design with four replications was used, where N rates were allocated in the main plots and time of N application was distributed at random in the subplots. 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.

Changes in the processing quality of sugar beet (Beta vulgaris L.) during long‐term storage under controlled conditions

SummaryLong‐term storage of sugar beet is an option to extend the processing campaign of the sugar factories in Europe. In the present study, changes in the processing quality of sugar beet were quantified during 110 days of storage at 7 and 20 °C. During storage, the concentration of sucrose decreased whereas K, Na, amino N, betaine, invert sugar and raffinose accumulated in the beets, i.e. quality was impaired markedly. At 7 °C, the changes in sucrose concentration were relatively small but the formation of invert sugar and raffinose caused considerable losses in beet quality. Thus, long‐term storage at low temperature is appropriate to prolong the campaign but processing costs will increase. Quality assessment with two formulae showed that measurements of K, Na and amino N are insufficient to evaluate stored sugar beets for recoverable sugar. Due to its increase in storage, the concentration of invert sugar should also be taken into account.

EFFECT OF NITROGEN FERTILIZATION AND LAST IRRIGATION ON YIELD AND QUALITY OF SUGAR BEET (Beta vulgaris L.) IN NORTHERN DELTA

Two field experiments were carried out at the Experimental Farm of EL-Serw Agricultural Station, Dommiata Governorate ,Agricultural Research Center ,Egypt during the two successive seasons of 2006/07 and 2007/08.The aim of this investigation to study the effect of nitrogen levels at rates of (80,100 and 120 kg N/fed) and three withholding irrigation dates of the last irrigation (3,4 and 5 weeks before harvest) on yield and quality of sugar beet . The results showed that: 1- There is significant effect of nitrogen fertilizer levels on root diameter, root fresh weight , purity %, root and sugar yields (t/fed) in both seasons and significant for sucrose percentage in the second season, TSS% in the first season while it is insignificant effect for root length in both seasons. The treatment of 120kgN/fed increased root yield by 64.157 % and 25.78% and sugar yield by 53.23% 21.25% compared by addition 80 kg N/fed in both seasons. 2- Effect of withholding last irrigation was significant for root length ,sucrose percentage ,sugar yields in both seasons and significant effect on root fresh weight in the second season and root yield in the first season and insignificant effect on purity percentage in both seasons. Applying the irrigation 5 weeks before harvest gave the lowest root length ,root fresh weight and the lowest root and sugar yields while gave the highest sucrose and purity percentages in both seasons. 3- The interaction between nitrogen fertilizer levels and withholding of last irrigation was significant effect on root length and root fresh weight in the second season ,TSS% in the first season and sucrose percentage in both seasons ,but it was insignificant effect on root diameter, root and sugar yields in both seasons. 4- From this study we can advise to use nitrogen fertilization at rate of 120 kg/fed and date of last irrigation 4 weeks before harvest to obtain the maximum yield and quality of sugar beet in East Northern Delta.