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تعیین فسفر خاک با روش گرادیان پخشیدگی در لایه نازک (DGT)در برخی خاکهای آهکی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 3، دوره 48، شماره 4، آذر 1396، صفحه 715-723 اصل مقاله (631.42 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2017.213735.667522 | ||
| نویسندگان | ||
| رضا خراسانی* 1؛ اکرم حلاج نیا2؛ حدیثه رحمانی3؛ حمید پوران4 | ||
| 1هیأت علمی / دانشکده کشاورزی دانشگاه فردوسی مشهد | ||
| 2عضو هیئت علمی/دانشکده کشاورزی دانشگاه فردوسی مشهد | ||
| 3دانشجو/دانشکده کشاورزی دانشگاه فردوسی مشهد | ||
| 4دانشگاه لندن | ||
| چکیده | ||
| گرادیان پخشیدگی در لایه نازک (DGT) به‌عنوان یک روش تعیین فسفر در برخی از خاکها مورد استفاده قرار می‌گیرد. این روش در 10 خاک آهکی متفاوت مورد بررسی قرار گرفت، میزان استخراج فسفر توسط این روش با 5 روش مختلف دیگر و میزان فسفر جذب‌شده توسط گیاه گندم در یک آزمایش گلدانی در گلخانه مورد مقایسه و ارزیابی قرار گرفت. نتایج نشان داد با توجه به تنوع زیاد خاکها، مقدار غلظت فسفر قابل‌استخراج با روش DGT (CDGT) دارای دامنه گسترده بین 4/23 تا 6/494 میکرو‌گرم بر لیتر بود. به علت این تغییرات زیاد، همبستگی قوی بین فسفر استخراج‌شده توسط روش DGT با سایر روشها و جذب فسفر گیاه مشاهده نشد؛ اما با بررسی جداگانه خاکهایی با CDGT کم این همبستگیها افزایش چشمگیری داشت. لذا میتوان گفت روش DGT برای ارزیابی فسفر در خاکهای آهکی با CDGTکمتر از µg/l250 به دلیل همبستگی بیشتر این روش با سایر روش‌های ارزیابی فسفر و به‌ویژه جذب فسفر گیاه، قابل توصیه است. | ||
| کلیدواژه‌ها | ||
| جزء بندی فسفر؛ جذب فسفر؛ روش استخراج فسفر؛ فسفر قابل استفاده | ||
| عنوان مقاله [English] | ||
| Determination of phosphorus in some calcareous soils by Diffusive Gradients in Thin films (DGT) method | ||
| نویسندگان [English] | ||
| Reza Khorasani1؛ Akram Halajnia2؛ Hadiseh Rahmani3؛ Hamid Pouran4 | ||
| 1Ferdowsi University of Mashhad | ||
| 2Ferdowsi University of Mashhad | ||
| 3Ferdowsi University of Mashhad | ||
| 4Fellow of London Middle East Institute, SOAS, University of London | ||
| چکیده [English] | ||
| Diffusive Gradients in Thin films (DGT) method is used as a method of phosphorus determination in some soils. This method was used to evaluate P in 10 different calcareous soils; Extractable phosphorous by this methods was compared with 5 other methods and P uptake by wheat plant in a glasshouse pot experiment. The results showed that the range of P concentration extracted by DGT method (CDGT) was between 23.4 and 494.6 µg L-1 affected by soil types. Because of these changes, no correlations were observed between P concentration extracted by DGT with other methods and P uptake by wheat plant. However, in a separate investigation in some soils with low CDGT, the correlation was highly increased. Therefore, it can be supposed that using of DGT method is recommendable for evaluation of P in calcareous soils with CDGT lower than 250 µg/l, due to strong correlations between this method and other methods, especially phosphorous uptake. | ||
| کلیدواژه‌ها [English] | ||
| Available P, P extraction method, P Fractionation, P Uptake | ||
| مراجع | ||
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