بررسی شاخص‌های فیزیولوژیکی مرتبط با رشد رقم‌های مختلف جو تحت تأثیر تاریخ کاشت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، گروه زراعت و اصلاح نباتات، دانشکدۀ کشاورزی دانشگاه آزاد اسلامی، واحد اصفهان

2 دانشیار، گروه زراعت و اصلاح نباتات، دانشکدۀ کشاورزی دانشگاه آزاد اسلامی، واحد اصفهان

چکیده

به‌منظور بررسی اثر تاریخ کاشت بر ویژگی‌های رشدی رقم‌های جو، آزمایشی در سال زراعی 91-1390 در ایستگاه تحقیقاتی دانشکدۀ کشاورزی دانشگاه آزاد اسلامی واحد اصفهان، به‌صورت کرت­های خردشده در قالب طرح پایۀ بلوک­های کامل تصادفی با سه تکرار اجرا شد. تاریخ کاشت در سه سطح (1 آبان، 15 آبان و 3 آذر) در کرت­های اصلی و رقم‌ها در سه سطح (نصرت، شمارۀ 4 شوری و فجر 30) در کرت­های فرعی قرار گرفتند. برای تعیین روند رشد، نمونه‌برداری­ها هر دو هفته یک‌بار انجام پذیرفت. نتایج نشان داد که با تأخیر در تاریخ کاشت، از بیشینه مادۀ خشک کل و شاخص سطح برگ کاسته شد. تاریخ کاشت دوم بیشترین سرعت رشد محصول و سرعت اسیمیلاسیون خالص را داشت. رقم نصرت بیشترین وزن خشک کل، بیشترین شاخص سطح برگ و میزان سرعت رشد محصول بالاتری نسبت به دیگر رقم‌ها داشت. افت شاخص سطح برگ، مادۀ خشک کل و سرعت رشد محصول در انتهای دورۀ رشد در تاریخ‌های کاشت اول و 15 آبان در رقم فجر 30 کمتر از دیگر رقم‌ها بود. رقم‌های نصرت و فجر 30 بیشترین میزان سرعت اسیمیلاسیون خالص را داشتند. بیشترین خوابیدگی ساقه در تاریخ کاشت اول آبان و رقم نصرت مشاهده شد. بیشترین عملکرد دانه در تاریخ کاشت 15 آبان و رقم فجر 30 به دست آمد. در شرایط همسان با این آزمایش، استفاده از تاریخ کاشت 15 آبان و رقم فجر 30 برای کاشت جو به‌منظور تولید دانه قابل توصیه باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Studying some physiological factors influencing the growth of Barley cultivarsas affected by planting date

نویسندگان [English]

  • Najmeh Kamali 1
  • Mohammad reza Khajehpour 2
  • Ali Soleymani 2
1 Former M. Sc. Student, Department of Agronomy and Plant Breeding‎, Faculty of Agriculture, Islamic Azad University, Isfahan Branch, Iran
2 Associate Professor, Department of Agronomy and Plant Breeding‎, Faculty of Agriculture, Islamic Azad University, Isfahan Branch, Iran
چکیده [English]

In order to study the effects of planting date on growth characteristics of barley cultivars, a field experiment was carried out at the Agricultural Research Station of Islamic Azad University- Isfahan branch (2011-2012) as a split plot experiment in randomized complete blocks design with three replications. Various planting dates (October 23rd, November 6th, and November 24th) were main plots whereas three cultivars (Nosrat, No. 4, Shooriand Fajr 30) were subplots. To evaluate the growth process, samplings were done every two weeks. According to results, total dry matter and leaf area index were decreased by late planting. Second planting date had the highest crop growth rate and net assimilation rate. Maximums of total dry weight, leaf area index and crop growth rate were belonging to Nosrat cultivar. Fajr 30 had less final decrease in leaf area index, total dry matter and crop growth rate than other cultivars for the first and second planting dates. Nosrat and Fajr 30 cultivars had the highest net assimilation rate. The highest amount of stem lodging was observed in first sowing date and Nosrat cultivar. The highest grain yield was obtained from second planting date and Fajr30 cultivar. On the whole, planting Fajr30 cultivar at November 6th can be recommended for seed production in regions similar to this study.

کلیدواژه‌ها [English]

  • Crop growth rate
  • Net assimilation rate
  • leaf area index
  • yield
  • total dry matter
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