بررسی اثرات متقابل رقابتی کلزا (Brassica napus) در برابر خردل وحشی (arvensis Sinapis) با استفاده از روش سری جایگزینی

پژوهش های حفاظت گیاهان ایران

مقاله 1، دوره 30، شماره 4 - شماره پیاپی 34، دی 1395، صفحه 677-683   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jpp.v30i4.53099

نویسندگان

سعید اصلانی؛ سعید سعیدی پور^*

دانشگاه آزاد اسلامی، واحد شوشتر

چکیده

آزمایشی گلخانه‏ای به منظور بررسی اثر رقابتی تراکم های مختلف خردل وحشی در مقابل کلزا در سال 1393-1394 در دانشکده کشاورزی دانشگاه آزاد اسلامی واحد شوشتر انجام شد. آزمایش در قالب طرح بلوک های کامل تصادفی با چهار تکرار با استفاده از سری‏های جایگزینی که در آن خردل وحشی و کلزا به ترتیب در نسبت های مختلف از 8:0، 6:2، 4:4، 2:6 و 0:8 با مجموع 8 بوته در هر گلدان کاشته شدند، انجام شد. نتایج نشان داد که حداکثر وزن خشک، ارتفاع، تعداد شاخه، تعداد غلاف در بوته و تعداد دانه در غلاف و عملکرد در کلزا در کشت خالص آن به دست آمد. حضور 25 و 75 درصدی خردل وحشی در ترکیب کشت، عملکرد کلزا را به ترتیب تا 50 و 96 درصد کاهش داد. ارزیابی کلی از عملکرد نسبی نشان داد که هر دو گونه به روش مشابهی از منابع بهره برداری نموده و از این رو دارای اثرات آنتاگونیستی متقابل هستند. ضریب رقابت نسبی کلزا در برابر خردل وحشی تنها در نسبت 2:6 بیشتر از دیگر نسبت‏های گیاهی بود. از طرفی شاخص رقابت نشان داد که خردل از توانایی رقابتی بالاتری نسبت به کلزا برخوردار بوده و مدیریت این علف هرز در مراحل ابتدایی رشد کلزا برای حصول عملکرد مطلوب امری اجتناب ناپذیر است.

کلیدواژه‌ها

تراکم؛ ضریب رقابت نسبی؛ عملکرد نسبی؛ وزن خشک

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