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، اسفند 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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