پرویز رضوانی مقدم قربانعلی اسدی بهاره بیچرانلو


به‌منظور بررسي کارايي مصرف نور در نسبت‌هاي جايگزيني کشت مخلوط ذرت و کدو پوست‌کاغذي، آزمايشي در قالب طرح بلوک‌هاي کامل تصادفي با سه تکرار در مزرعه‌اي واقع در 10 کيلومتري غرب شهرستان شيروان در سال 1394 اجرا شد. تيمارهاي آزمايش شامل نسبت‌هاي جايگزيني 75% ذرت+ 25% کدو پوست‌کاغذي، 50% ذرت + 50% کدو پوست‌کاغذي و 25% ذرت + 75% کدو پوست‌کاغذي و کشت خالص هر يک از گياهان بود. نتايج حاکي از وجود رابطه خطي بين تجمع ماده خشک هر دو گياه با تشعشع فعال فتوسنتزي تجمعي در تيمارهاي مختلف کشت مخلوط با ضريب همبستگي بيشتر از 9/0 بود. کارايي مصرف نور براي ذرت از 92/0 گرم بر مگاژول در نسبت 25 درصدي ذرت در کشت مخلوط تا 35/4 گرم بر مگاژول در کشت خالص و کارایی مصرف نور برای کدوی پوست‌کاغذی از 87/0 گرم بر مگاژول در نسبت 75%کدوی پوست‌کاغذی: 25% ذرت تا 7/3 گرم بر مگاژول در کشت خالص آن متغير بود. بيشترين ميزان تشعشع جذب شده کل در بين نسبت‌هاي مختلف کشت مخلوط، در نسبت 50% (کدو پوست‌کاغذي): 50% (ذرت) و نسبت 75% (کدو پوست‌کاغذي): 25% (ذرت) مشاهده شد که در زمان بين 110-70 روز پس از کاشت ميزان تشعشع جذب شده کل پوشش گیاهی حداکثر و با ميزان تشعشع رسيده به پوشش گیاهی هم‌پوشاني داشت. بالاترین مقدار شاخص برداشت ذرت (5/59) در نسبت 75% کدوی پوست‌کاغذی: 25% ذرت و بالاترین مقدار شاخص برداشت کدوی پوست‌کاغذی (1/24) در نسبت 50% کدوی پوست‌کاغذی: 50% ذرت به‌دست آمد. بیشترین نسبت برابری زمین برای کارایی مصرف نور ذرت و کدوي پوست‌کاغذي در نسبت 25% کدوی پوست‌کاغذی: 75% ذرت و سپس در نسبت 50% کدوی پوست‌کاغذی: 50% ذرت (به‌ترتیب 49/5 و 04/5) مشاهده شد که بالاترین میزان شاخص برداشت را نیز نشان دادند.

جزئیات مقاله

کلمات کلیدی

پوشش گیاهی, تشعشع فعال فتوسنتزي, جذب نور, شاخص سطح برگ, عملکرد

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ارجاع به مقاله
رضوانی مقدمپ., اسدیق., & بیچرانلوب. (2019). ارزيابي کارايي مصرف نور ذرت (Zea mays L.) و کدوي پوست‌کاغذي (Cucurbita pepo var. styriaca) در نسبت‌هاي مختلف کشت مخلوط. پژوهشهای زراعی ایران, 18(2), 167-180. https://doi.org/10.22067/gsc.v18i2.73192
نوع مقاله
علمی پژوهشی