رابطه آلومتریک بین برخی صفات مورفوفیزولوژیک ذرت تحت تاثیر سیستم‏ های خاکورزی و تاریخ کاشت

نوع مقاله : مقاله کامل

نویسندگان

گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه شیراز، شیراز ، ج. ا. ایران

چکیده

چکیده-آزمایشی مزرعه ای به منظوربررسی رابطه میان سطح برگ ذرت با تعداد برگ˛وزن خشک برگ وزن خشک کل اجزای رویشی و ارتفاع بوته انجام شد. تیمارها شامل دو سیستم خاکورزی ( خاکورزی متداول و بی خاکورزی) و هفت تاریخ کشت ( 21 اردیبهشت˛ 28 اردیبهشت˛ 4 خرداد˛ 11خرداد˛ 18 خرداد˛ 25خردادو 1 تیر) بود. این مطالعه درمزارع تحقیقاتی دانشکده کشاورزی دانشگاه شیراز در سالهای زراعی 94-93 انجام شد. اثر برهمکنش میان تاریخ کشت و سیستم خاکورزی معنی داربود و در هر دو سال بیشترین سطح برگ˛تعدادبرگ˛وزن خشک برگ˛وزن خشک کل اجزای رویشی و ارتفاع بوته درتاریخ کشت های زود هنگام درهردو سیستم کشت و کمترین مقدار آن ها درآخرین تاریخ کشت (1 تیرماه) و درسیستم بی خاکورزی مشاهده شد.به منظور تعیین روابط آلومتری بین سطح برگ و صفات رویشی از معادله پلی نومیال استفاده شد که نتایج رابطه معنی داری را بین سطح برگ وتعداد برگ (R2=96/0 و R2= 98/0)˛ وزن خشک برگ (R2=98/0 و R2= 98/0)˛ وزن خشک کل اجزای ر ویشی (R2=96/0 و R2= 96/0) و ارتفاع بوته (R2=96/0 و R2= 96/0) نشان داد. ازروابط آلومتری می توان در جهت درک بهتر رشد و نمو ذرت که لازمه مدیریت بهینه گیاه زراعی وبهبود وضعیت ژنتیکی آن است استفاده کرد.

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