اثرات قارچ میکوریز آربسکولار، باکتری محرک رشد گیاه و تنش خشکی بر روی شکل‏های مختلف پتاسیم و تغییرات کانی‏های

نوع مقاله : مقاله کامل

نویسندگان

دانشگاه شیراز

چکیده

چکیده- آزمایش گلخانه ای با استفاده از آزمون فاکتوریل در قالب طرح کاملا تصادفی  به منظور بررسی اثرات قارچ گلوموس اینترارادایسز، باکتری سودوموناس فلورسنس و تنش خشکی بر روی شکل­های مختلف پتاسیم و تغییرات کانی­های رسی در یک خاک آهکی خاک زیر کشت ذرت  انجام شد. تیمارها شامل قارچ میکوریز آربسکولار در دو سطح  G0­(تلقیح نشده با قارچ)و­ G1 (گلوموس اینترارادایسز)­،  باکتری سودوموناس فلورسنس در دو سطح B0­ (تلقیح نشده با باکتری) و  B1­(سودوموناس فلورسنس­)، تنش خشکی در چهار سطح ­S0 (بدون تنش)،  S1­(تنشFC  75%)، S2(تنش FC50%) و S3­(تنشFC  25%) بود. با افزایش تنش خشکی، همه شکلهای پتاسیم افزایش و درصدکلنیزاسیون ریشه کاهش یافت. مایه زنی میکروبی درصد کلنیزاسیون ریشه و همه شکلهای پتاسیم خاک را در مقایسه با تیمارهای مایه زنی نشده افزایش داد. با این وجود اثرات مایه زنی انفرادی گیاه با باکتری کمتر بود. بیشترین درصد کلنیزاسیون ریشه و مقدار شکلهای مختلف پتاسیم در تیمارهای مایه زنی گیاه با هر دو قارچ و باکتری در مقایسه با تیمارهای مایه زنی انفرادی مشاهده شد. با افزایش تنش خشکی مقدار کانی های ایلایت-کلریت افزایش یافت. با افزایش سطوح تنش خشکی، در تیمارهای غیر میکوریزی کانی های اسمکتیت مشاهده نگردید در حالیکه در تیمارهای میکوریزی مقدار این کانی ها افزایش یافت. بطور کلی نتایج  نشان داد که کودهای زیستی و تنش خشکی در هوادیدگی  و انحلال کانیها و  رهاسازی پتاسیم موثر هستند.

کلیدواژه‌ها

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