RESPONSE OF SUGAR BEET (BETA VULGARIS, L.) TO POTASSIUM APPLICATION AND IRRIGATION WITH SALINE WATER استجابة بنجر السکر لإضافة البوتاسيوم والرى بماء ملحى

Document Type : Original Article

Abstract

ABSTRACT :




A pot experiment was conducted during the winter growing seasons of 2001/2002 and 2002/2003 in the greenhouse of the Faculty of Agric., Al-Azhar Univ., Assiut campus. A complete randomized design with four replications was used in this study. A combination of four potassium levels (0, 24, 48, and 72 kg K2O /fed) with four levels of saline irrigation water (tap water, 2000, 4000 and 6000 ppm) on root yield and some chemical composition of sugar beet.
The mean effects of these interactions confirmed depressing manner in sugar beet growth with increasing salt concentration in the irrigation water up to 6000. The same trend holds true regarding both refineable sugar and purity percentages of the root juice. On contrary, TSS% in roots was significantly increased under such prevailing unfavourable conditions. The sustainable results ascertained the significance effect of salinity levels in irrigation water on K, Na or K/Na ratio in roots of sugar beet. Total soluble solids, refineable sugar, purity percentages of root juice, total root yield and top yield of sugar beet plants increased as K fertilizer increased. Generally, sugar beet plants could tolerate saline water up to 2000 ppm without impaired effects on growth yield and quality. Moreover, K application resulted in improving the quality of sugar beet roots either irrigated with saline water or with tap water.
أجريت هذه التجربة في صوبة بکلية الزراعة جامعة الأزهر أسيوط خلال موسمى النمو الشتوي 2001/2002م ، 2002/2003م فى نظام قطاعات عشوائية لاختبار التداخلات بين مستويات مختلفة من السماد البوتاسي (صفر، 24، 48، 72 کم بو2 أ/فدان) مع ثلاث مستويات من الري بماء ملحى (2000 ، 4000 ، 6000 جزء فى المليون) مع استعمال ماء الصنبور للمقارنة علي محصول الجذور والترکيب الکيميائي لنبات بنجر السکر.
التأثير الرئيس لهذه التفاعلات أکدت انخفاض فى نمو نبات بنجر السکر مع زيادة ترکيز الأملاح بماء الري إلي 6000 جزء في المليون. نفس الاتجاه کان يتحقق بخصوص کلا من نسبة صافي السکر والنقاوة فى العصير. وعلي العکس فإن النسبة المئوية للمواد الصلبة الکلية في الجذور قد زادت معنوياً تحت ظروف الري الملحي السائد. أکدت النتائج تحقيق التأثير المعنوى لمستويات الملوحة فى ماء الري على البوتاسيوم والصوديوم وکذلک النسبة بين البوتاسيوم إلي الصوديوم فى جذور نبات بنجر السکر. نسبة المواد الصلبة والسکر الصافى والسکروز في عصير الجذور وکذلک محصول الجذر والأوراق لکل نبات من بنجر السکر زادت مع إضافة السماد البوتاسي.
عامة، نبات بنجر السکر يستطيع تحمل الملوحة في ماء الري حتى 2000 جزء في المليون بدون تأثير يذکر علي النمو أو المحصول أو بعض صفات الجودة تحت الدراسة وکذلک إضافة سماد البوتاسيوم أدي لتحسين المحصول وصفات الجودة لنبات بنجر السکر سواء رويت بماء ملحي (مستوى 4000 جزء فى المليون) أو ماء عذب.

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