مقایسة تأثیر اکسید آهن نانو و غیر نانو بر گونه‌بندی و فراهمی فسفر در خاک‌های آهکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد رشتة علوم خاک دانشکدة کشاورزی دانشگاه فردوسی مشهد

2 دانشیار و عضو هیئت علمی دانشگاه فردوسی مشهد

3 استادیار و عضو هیئت علمی دانشگاه فردوسی مشهد

4 استادیار و عضو هیئت علمی دانشگاه تربت‌حیدریه

چکیده

رفتار شیمیایی فسفر در خاک تابعِ پیچیده‌ای از عوامل مختلف از جمله اکسیدهای آهن است. هدف این پژوهش بررسی تأثیر اندازه (نانو و غیر نانو) و غلظت ذرات اکسید آهن بر گونه‌بندی و فراهمی فسفر برای گیاه بود. پژوهش به صورت طرح آزمایشی فاکتوریل در قالب طرح پایة کاملاً تصادفی در چهار تکرار و پنج سطح اکسید آهن غیر نانو و پنج سطح اکسید آهن نانو (0، 500، 1000، 5000، 10000 mgkg-1) انجام پذیرفت. گونه‌بندی فسفر به روش عصاره‌گیری پی‌درپی انجام شد. کاربرد نانو‌ذرات اکسید آهن باعث کاهش معنادار فسفر اولسن در نمونه‌ها شد و در تیمار 5000 mgkg-1 مقدار فسفر اولسن از 3 میلی‌گرم بر کیلوگرم در تیمار شاهد به 9/0 میلی‌گرم بر کیلوگرم کاهش یافت؛ در حالی که این تغییر در مورد اکسید آهن غیر نانو معنادار نشد. کاهش معنادار در شکل‌های Ca2-P و Ca8-P با تغییرات اندازه و غلظت اکسید آهن مشاهده شد که این کاهش در تیمارهای نانو شدید‌تر بود. تغییرات شکل Ca10-P در تیمارها معنادار نشد. تغییرات شکل Fe-P با تغییر غلظت آهن معنادار شد؛ اما شکل O-P فقط در تیمار 10000 اکسید آهن نانو معنادار شد. با توجه به تأثیر اندازة ذرات اکسید آهن بر رفتار شیمیایی فسفر در خاک، به نظر می‌رسد باید به آثار جانبی کاربرد نانوذرات اکسید آهن در خاک توجه ویژه‌ای کرد.

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Nano vs Micro Iron Oxide on Phosphorus Availability and Fractionation in Calcareous Soils

نویسندگان [English]

  • salman Raouf Yazdi Nejad 1
  • Amir Fotovvat 2
  • Reza khorasani 3
  • Hasan Feizi 4
  • Alireza Karimi karouyeh 3
1 Graduate Student, soil sciences, faculty of Agriculture, Ferdowsi University of Mashhad
2 Associate Professor, Faculty member of Ferdowsi University of Mashhad
3 Assistant Professor, Faculty member of Ferdowsi University of Mashhad
4 Assistant Professor, Faculty member of Torbat Heidarrieh University
چکیده [English]

Phosphorus exhibits complex chemical behavior in response to such various soil factors as iron oxide. The effect of size and concentration of iron oxide particles on different forms of phosphorous in soil as well as its availability to plants was investigated. The study was conducted in the form of a factorial arranged  experiment based upon a completely randomized design of four replications along with five levels of bulk iron oxide vs nano iron oxide (0, 500, 1000, 5000, 10000 mgkg-1).The results revealed that the use of iron oxide nanoparticles in all the samples reduced Olsen P concentration. The concentration was reduced from 3 mgkg-1 in bulk sample to 0.9 mgkg-1 in 5000 mgkg-1 nanoparticle sample, while this effect was not observed in the case of bulk iron oxide. A significant variation in Ca2-P, Ca8-P concentration was observed with changes in size and concentration of iron oxide, especially in Nano treatments. The changes in Ca10-P levels in the case of nano treatments were greater than those in bulk treatments, but not statistically significant. Iron oxide concentration significantly affected the level of Fe-P form. O-P form showed significant difference (compared with blank) only in the case of 10000 mgkg-1 of nano iron oxide.

کلیدواژه‌ها [English]

  • Calcium Phosphate
  • Inorganic phosphorus
  • Iron Phosphate
  • Occluded Phosphorus

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