تعیین CWSI به منظور برآورد تبخیر-تعرق و عملکرد بادنجان تحت شرایط گلخانه و مزرعه

نوع مقاله : مقاله کامل

نویسندگان

1 بخش آبیاری، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ج. ا. ایران

2 دانشگاه شهید چمران اهواز

3 دانشگاه جهرم

چکیده

چکیده- شاخص تنش آبی گیاه (CWSI) یکی از متداول‌ترین شاخص‌های مبتنی بر دمای پوشش سبز، برای پایش و تعیین تنش آبی گیاهان می‌باشد. برای محاسبه CWSI حدود مبنای بالایی و پایینی منطبق بر محیط های مختلف مورد نیاز می‌باشد. در این پژوهش، معادلات خطوط مبنای تجربی و نظری به منظور تعیین مقادیر CWSI گیاه بادنجان در سطوح مختلف تنش آبی و شوری ارائه گردیده است. خطوط مبنا و CWSI بادنجان تحت فواصل مختلف آبیاری ( روزانه، هفتگی و دو هفته‌ای) سطوح مختلف شوری آب ( یعنی 8/0 ، 5/2، 0/5 و 0/7 دسی زیمنس بر متر ) در شرایط گلخانه و مزرعه به دست آمد. تاثیر سطوح مختلف تنش آبی و شوری بر تبخیر-تعرق کلی، عملکرد و CWSI نیز مورد مطالعه قرار گرفت. با افزایش شوری آب، کاهشی در شیب خط مبنای پایینی ( از 195/0 به 146/0 در گلخانه و از 134/0 به 098/0 مزرعه) توام با صعود خط مبنای بالایی تنش مشاهده گردید.افزایش سطوح تنش آبی به نوسانات بیشتر در مقادیر CWSI در طول فصل رشد منجر گردید. با توجه به نتایج آزمون دانکن مقادیر CWSI در هر دو محیط کشت به طور معنی داری تحت تاثیر کمبود آب و شوری می‌باشند.

کلیدواژه‌ها

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