اعلانات هامة

A field experiment carried out in Deir Ezzor research center in 2010-2011 season to study the effect of decreasing of nitrogen fertilizer on the productivity and the quality of sugar beet, the levels of nitrogen applications are 10%-20%-30% of nitrogen recommendation. The potassium and phosphor fertilizer were according to sugar beet recommendation for all treatment.

The results have shown that plant feeding on nitrogen was significantly suitable when decreasing the nitrogen recommendation to 30% (L4) although the soil nitrogen was decreased from 12.54 ppm in L1treatment (according to recommendation) to 8.99 ppm in L4 treatment. Also, the root and leaves production wasn't influenced by the decreasing of nitrogen application. Likewise, theoretical sugar and pure sugar yield too weren't influenced by the decreasing of nitrogen application, the amount of theoretical sugar was between 12.21-13.03 ton/h in the treatments and the amount of pure sugar was between 10.27-10.79 ton/h for treatments L2,L3,L4 while L1 was 9.74 ton/h. The results have shown that Sucrose and Brix weren't affected significantly by the decreasing of nitrogen added rate according to the studied treatments, whereas the Sucrose percentages were 15.74% for L1 treatment and 16.56% for L4 treatment. Also the Brix percentages ranged between 19.99-20.13% for the studied treatments.

Nonsignificant difference for increasing of juice purity attracts attention, ranged between 82.81-84.44% percentage for treatments L2, L3, L4 compared with L1 treatment (77.15%).

Keywords: Level nitrogen applications, sugar beet quality and productivity.

انطلاقا من وجهة نظر بيئية و أخرى اقتصادية نفذت تجارب حقلية في مركز بحوث دير الزور خلال الموسم الزراعي لعام 2010-2011 بهدف دراسة تأثير خفض كمية السماد الآزوتي في إنتاجية ونوعية محصول الشوندر السكري، و ذلك بخفض معدل الإضافة بنسبة 10%، 20%، 30% من كمية الإضافة حسب التوصية السمادية، و أضيفت الأسمدة الفوسفاتية و البوتاسية حسب تحليل التربة والتوصية السمادية لجميع المعاملات المدروسة.