تاثیر مقادیر و زمان کاربرد کود ریزمغذی بر ویژگی های کمی و کیفی گلرنگ (Carthamus tinctorius L. )

نوع مقاله : مقاله پژوهشی

نویسندگان

شاهد تهران

چکیده

گلرنگ یکی از دانه های روغنی سازگار به طیف وسیعی از شرایط خاکی ایران است که کمبود عناصر ریزمغذی سبب کاهش عملکرد کمی و کیفی آن می شود. به منظور بررسی تاثیر میزان و زمان مصرف کود ریزمغذی بر عملکرد دانه، اجزاء عملکرد و ویژگی های کیفی روغن دانه گلرنگ ژنوتیپ Mex141 آزمایشی به صورت فاکتوریل در قالب طرح پایه بلوک‏های کامل تصادفی در 3 تکرار اجرا گردید. عامل ها شامل محلولپاشی برگی کود ریزمغذی در چهار سطح (1- بدون مصرف کود ریزمغذی (F 1)، 2- مصرف 5/2 کیلوگرم (F 2)، 3- مصرف 3 کیلوگرم (F 3) و 4- مصرف 5/4 کیلوگرم در هکتار (F 4)) و زمان کاربرد (3 T1= ، 4 T2= و 5 T3= هفته) کود پس از شکل گیری طبق بودند. نتایج نشان داد که صفات شروع و خاتمه گل دهی، طول دوره گل دهی، ارتفاع اولین شاخه زایشی (طبق)، تعداد شاخه فرعی، تعداد دانه در طبق، قطر طبق، عملکرد دانه، محتوی روغن و پروفیل اسیدهای چرب غیراشباع روغن تحت تاثیر مقادیر کود ریزمغذی و زمان کاربرد آن و برهم کنش آنها قرار گرفت. با افزایش مصرف کود ریزمغذی، عملکرد دانه افزایش یافت و بیشترین میزان آن (1/1791 کیلوگرم در هکتار) با کاربرد 3 کیلوگرم کود ریزمغذی در 4 هفته پس از شکل گیری طبق حاصل شد. میزان کود بر محتوی اسیدهای چرب غیراشباع روغن دانه تاثیر داشت به طوری که بیشترین میزان اسید چرب (92/15درصد) تک باند دوگانه اولئیک (18:1) بدون یا با مصرف کمترین میزان کود ریزمغذی بدست آمد. همچنین بیشترین میزان (97/75 درصد) اسید چرب با دو باند دوگانه لینولئیک (18:2) با مصرف 5/4 کیلوگرم درهکتار ریزمغذی و بیشترین میزان (29/0 درصد) اسید چرب با سه باند دوگانه اسید چرب لینولنیک (18:3) با مصرف متعادل (3 کیلوگرم درهکتار) کود ریزمغذی حاصل شد. اثر برهم کنش کود ریزمغذی و زمان کاربرد کود بر محتوی اسیدهای چرب غیراشباع نظیر لینولئیک (18:2) و لینولنیک (18:3) معنی دار (01/0 p

کلیدواژه‌ها


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