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پیش بینی دماهای کاردینال جوانه‌زنی هویج (Daucus carota L.) و سه گونه علف هرز غالب آن با استفاده از مدل های رگرسیون غیر خطی | ||
| علوم و فناوری بذر ایران | ||
| مقاله 13، دوره 8، شماره 1 - شماره پیاپی 15، تیر 1398، صفحه 175-184 اصل مقاله (794.01 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/ijsst.2019.114915.1120 | ||
| نویسنده | ||
| مرجان دیانت* | ||
| هیات علمی دانشگاه ازاد اسلامی-واحد علوم و تحقیقات تهران | ||
| چکیده | ||
| مدیریت هویج به ویژه از جهت علف‌های هرز بسیار مشکل است. جوانه‌زنی بذر در مدیریت علف‌های هرز هویج یک فرایند کلیدی است زیرا می‌تواند تعداد علف های هرزی را که در هویج سبز می شوند و زمان سبز شدن آنها را تعیین کند. این آزمایش جهت بررسی دو مدل خطوط متقاطع و دندان مانند برای توصیف واکنش سرعت جوانه‌زنی هویج (Daucus carota L.)، گندمک (Stellaria media (L.) Vill.)، اسب واش (Setaria glauca (L.) P. Beauv.) و پیر بهار (Conyza canadensis (L.) Cronq.) به دما صورت گرفت. آزمایش در قالب طرح کاملا تصادفی و با 4 تکرار در دانشگاه آزاد اسلامی- واحد علوم و تحقیقات انجام شد. بذور با دماهای 2، 5، 10، 15، 20، 25، 30، 35، 40 و 45 درجه سانتیگراد تیمار شدند. نتایج حاصل از تجزیه واریانس نشان داد که درصد و سرعت جوانه‌زنی در سطح یک درصد تحت تاثیر دما قرار گرفتند. مدل خطوط متقاطع در هویج و مدل دندان مانند در گندمک، اسب واش و پیر بهار به خوبی سرعت جوانه‌زنی را نسبت به دما توصیف نمودند. با توجه به مدل برتر، دماهای پایه، بهینه و بیشینه در هویج 67/1، 84/22 ، 16/43 ، در گندمک 58/3، 67/19-82/18، 75/42، در اسب واش 17/14، 92/34-75/33، 86/44 و در پیر بهار 74/13، 94/31-73/31، 21/44 درجه سانتیگراد بود. نتایج نشان داد که هویج به علت پایین‌تر بودن دمای پایه نسبت علف های هرز مورد بررسی می‌تواند زودتر جوانه زند بنابراین کشت زودتر به آن امکان استقرار زودتر را داده و بهتر می‌تواند با علف‌های هرز رقابت کند. | ||
| کلیدواژه‌ها | ||
| درصد جوانه‌زنی؛ سرعت جوانه‌زنی؛ مدل خطوط متقاطع؛ مدل دندان مانند | ||
| عنوان مقاله [English] | ||
| Prediction of cardinal temperature by nonlinear regression models in carrot (Daucus carota L.) and three common weed species | ||
| چکیده [English] | ||
| Carrot is a particularly difficult crop to manage in terms of weed control. For weed management of carrot, seed germination is a key process because it determines both the number of weeds that could potentially emerge and the timing of their appearance in the carrot. This study was done to evaluate two nonlinear regression models (Intersected-lines and Dent-like) to describe response of germination rate to temperature in carrot (Daucus carota L.), common chickweed (Stellaria media (L.) Vill.), yellow foxtail (Setaria glauca (L.) P. Beauv.) and canada fleabane (Conyza canadensis (L.) Cronq.). This experiment was based on completely randomized design with 4 replications at Islamic Azad University, Science Research Branch, in 2015. The seeds were treated with different temperatures (2, 5, 10, 15, 20, 25, 30, 35, 40 and 45oC). The analysis of variance showed that temperature had a significant effect on all seed germination percentage and germination rates. Intersected-lines model was superior in carrot and Dent-like model was superior for common chickweed, yellow foxtail and canada fleabane. Base, optimum and maximum temperatures were predicted with appropriate model. Base, optimum and maximum temperatures were for carrot 1.67, 22.84, 43.16; common chickweed 3.58, 18.82-19.67, 42.75; yellow foxtail 14.17, 33.75-34.92, 44.86 and canada fleabane 13.74, 31.73-31.94, 44.21ºC, respectively. This results showed that carrot germinated earliest among the studied species, because it had the lowest base temperature, so sooner planting it was caused sooner carrot establishment and less weed competition. | ||
| کلیدواژه‌ها [English] | ||
| Germination rate, Germination percentage, Intersected-lines model, Dent-like model | ||
| مراجع | ||
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