تأثیر العجز المائى على إنتاجیة الفاصولیا وکفاءة استخدام المیاه تحت نظام الرى بالتنقیط

نوع المستند : Original Article

المؤلفون

1 مدرس بقسم الهندسة الزراعیة - کلیة الزراعة - جامعة قناة السویس، مصر.

2 مدرس بقسم الهندسة الزراعیة - کلیة الزراعة - جامعة الزقازیق، مصر.

المستخلص

أجری تجربة حقلیة بمزرعة کلیة الزراعة - جامعة قناة السویس، بالإسماعیلیة، مصر خلال فصل الصیف 2016م فى تربة رملیة على محصول الفاصولیا تحت نظام الرى بالتنقیط، وکان الهدف الرئیسی من هذه الدراسة هو دراسة تأثیر العجز المائى نسبة من الأستهلاک المائى  (T1: 100 %, T2: 75 % and T3: 50 % ETc) وتأثیر أنواع مختلفة من المنقطات المرکبة داخل الخط (Em1)، والمرکبة على الخط (Em2) على إنتاجیة وکفاءة إستخدام المیاه (WUE)  مع طول الخط 50 م وضغوط تشغیل مختلفة (50، 100، 150، 200 کیلوبسکال) وأشارت النتائج أن معامل انتظامیة المیاه (CU) یزداد بزیادة ضغط التشغیل من 50 الى 100 کیلوبسکال وینخفض مع زیادة ضغط التشغیل من 100 إلى 200 کیلوبسکال. أعطت المعاملة الأولى أعلى إنتاجیة بدون أى فروق معنویة مع المعاملة الثانیة لذلک فإن المعاملة الثانیة 75% تعتبر أحسن معاملة فى الإنتاجیة وتعمل على حفظ المیاه بنسبة 25 % من کمیة میاه الرى وتعتبر أحسن معاملة اقتصادیا. وکفاءة استخدام المیاة کانت عالیة فى المعاملة الثالثة ولکن المعاملة الثانیة کانت احسن اقتصادیا وتاثر محصول الفاصولیا معنویاً  بعلاقة خطیة مع ظروف نقص الرى.

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