استجابة بعض المؤشرات المورفولوجية والفيزيولوجية والإنتاجية في القطن لمعدلات مختلفة من السماد الآزوتي
Abstract
نفذ البحث في منطقة الغاب، لدراسة تأثير معدلات مختلفة من السماد الآزوتي 0، 60، 120، 180، 240 كغ N/هـ في صورة يوريا 46 % في بعض المؤشرات الفيزيولوجية والإنتاجية لصنف القطن حلب 133، بينت الدراسة النتائج الآتية:
ـ أدى إضافة معدلات 60 ـ 240 كغ N/هـ إلى زيادة معنوية في دليل المساحة الورقية، والمساحة النسبية للأوراق، ودليل الحصاد، ودليل المحصول، ودليل البذور، ودليل الحليج مقارنة مع الشاهد.
ـ أعطى المعدل 180 كغ N/هـ أكبر زيادة في قيم المتوسطات ونسبتها المئوية مقارنة مع الشاهد ومع جميع المعاملات المدروسة، انخفضت بالمقابل المؤشرات المدروسة عند المعدل 240 كغ N/هـ باستثناء دليل البذور الذي وصلت فيه الزيادة 16.53 ـ 17.0 % خلال موسمي البحث، ودليل الحليج الذي انخفض في الموسم الأول بنسبة 1.65%.
The research was carried out in Al-Ghab area to study the effects of 5 different rates of nitrogen fertilizer: 0, 60, 120, 180 and 240 Kg N/ha (Uria 46 %), on some physiological and productivity parameters of the cotton variety Aleppo 133. The results showed the following:
- The application of 60 – 240 kg N/ha significantly increased the values of leaf area index, leaf area ratio, harvest index, yield index, seed index and ginning index , compared with the control.
- The rate of 180 kg N/ha increased mean values and its percentage compared not only with the control but with all studied treatments. On other hand, the examined parameters decreased at the rate 240 kg N/ha except that of the seed index which increased to 16.53 – 17.0 %. during the two seasons and the ginning index decreased 1.65% in the first season.
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