دراسة شاملة لطرق مختلفة لقیاس معدلات التهویة الطبیعیة بمساکن الابقار الحلابة

نوع المستند : Original Article

المؤلف

مدرس – قسم الهندسة الزراعیة- کلیة الزراعة – جامعة القاهرة، مصر.

المستخلص

المشکلة الکبرى فی التهویة الطبیعیة هی عدم وجود طرق قیاس دقیقه لمعدل  تبادل الهواء (AER) وهو أمر حاسم لتقدیر الانبعاثات الغازیه. یهدف هذا البحث إلى المقارنة بین أربعة أسالیب، والتوصیة بتستخدام أسلوب واحد مع تطویره. تم تنفیذ ستة وثلاثین التجارب لدراسة AERs فی حظیرة الألبان ذات تهویة طبیعیة فی أربعة فصول صیف، ثلاثة مواسم الشتاء. وتم تحدید AERs باستخدام میزان الرطوبة (H2O) ، میزان الطاقة  (HB)، میزان  الکتلة لغاز CO2, وتقنیة التتبع الغازی بالمواد المشعة (TGT) . کانت التحلیلات الإحصائیة تحلیل الارتباط، نموذج الانحدار، ANOVA  واختبار t. وأجریت القیاسات المستمرة للترکیزات CO2 ودرجة الحرارة والرطوبة النسبیة داخل وخارج الحظیرة. وأظهرت نتائج میزان H2O انه یمکن الاعتماد علیها خلال فصل الشتاء ونتائج مقبولة قلیلا خلال الصیف. وأظهر میزانHB  نتائج مقبولة قلیلا خلال فصل الصیف ونتائج غیر مرضیة خلال فصل الشتاء. وأظهر میزان CO2 اختلافات غیر متوقعه مقارنة بالأسالیب الأخرى فی بعض الحالات. وأظهرت النتائج انTGT  هی الأفضل مقارنة بجمیع الطرق ومستقلة على النواحی الفسیولوجیة. ولذلک، ینبغی تطویر. TGT

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