Potassium reserves in soils with arid and semi-arid climate in southern Iran: a perspective based on potassium fixation

Document Type : Full Article


1 Department of Soil science, College of Agriculture, Malayer university, Malayer, I. R. Iran

2 Department of Civil, College of Civil Engineering, Sirjan University of Technology, Sirjan, I. R. Iran


ABSTRACT- The present research was conducted to study K forms and fixation in soils of southern Iran (Hormozgan Province) with aridic and aridic-ustic regimes and to address the relations between soil mineralogy and potassium forms. Thirteen surface soil samples (0-25 cm) were collected from different regions and analyzed in laboratory. Illite and feldspar and mica are the major clay and soil minerals for K reservoir, respectively. Mean of non-exchangeable, exchangeable and total content of K were equal to 31.3, 283.9 and 1080.6 mg kg-1 soils, respectively. These forms of K were abundant in plateau and piedmont plain physiographical unites while the greatest amount of soluble potassium was observed in flood and alluvial plain units. Despite the aridity of the region with low clay fraction and unlike the previous studies in calcareous arid soils of Iran, the amount of potassium fixation in soils was high, probably due to the predominance of micaceous minerals. In an adsorption experiment, the average K adsorption in soils was 71 percent after adding 1000 mg K kg-1. In general, the most active component in the K fixation was the silt fraction, dominated mica and illite. Potassium fixation boosted after increasing the wetting and drying cycles in relation to the samples that did not suffer these cycles.


Article Title [Persian]

نگهداری پتاسیم در خاک های با اقلیم خشک و نیمه خشک جنوب ایران: با تاکید بر تثبیت پتاسیم

Authors [Persian]

  • سهیلا سادات هاشمی 1
  • حکیمه عباسلو 2
1 گروه علوم خاک، دانشکده کشاورزی، دانشگاه ملایر، ملایر، ج. ا. ایران.
2 گروه عمران، دانشکده مهندسی عمران، دانشگاه سیرجان، سیرجان، ج. ا. ایران
Abstract [Persian]

چکیده- تحقیق حاضر برای مطالعه شکل های پتاسیم و تثبیت آن در خاکهای جنوب ایران، با رژیم رطوبتی اریدیک و اریدیک – یوستیک، با توجه به ارتباط بین کانی شناسی خاک و شکل های مختلف پتاسیم  صورت گرفته است. 13 نمونه خاک سطحی (25-0سانتیمتری) از نواحی مختلف جمع آوری و در آزمایشگاه تجزیه شدند. ایلایت از کانیهای اصلی رس و فلدسپار و میکا کانی های خاک برای نگهداشت پتاسیم هستند. میانگین پتاسیم غیرتبادلی، تبادلی و کل به ترتیب برابر با 3/31، 9/283 و 5/1080 میلی گرم بر کیلوگرم بدست آمد. این شکل های پتاسیم در واحدهای فیزیوگرافی فلات و دشت دامنه ای بیشترین فراوانی را داشته، در حالیکه بیشترین مقدار پتاسیم محلول در واحدهای دشت رسوبی و سیلابی مشاهده شد. علی رغم خشک بودن ناحیه با ذرات رس کم و مطالعات قبلی غیرمشابه در خاکهای آهکی نواحی خشک ایران، مقدار تثبیت پتاسیم در خاکها بسیار بالا بود، که احتمالا به دلیل غالب بودن کانی میکائی منطقه است. در آزمایش جذب میانگین جذب پتاسیم در خاکها 71 درصد پس از اضافه نمودن 1000 میلی گرم در کیلوگرم پتاسیم بدست آمد. به طور معمول  فعالترین جزء در تثبیت پتاسیم بخش سیلت با غالبیت میکا و ایلایت آن است. تثبیت پتاسیم پس از افزایش دوره های تری و خشکی نسبت به نمونه های که بدون چرخه تری و خشکی بودند، دارای روند کاهشی می باشد.

Keywords [Persian]

  • واژه‏های کلیدی:
  • ایلایت
  • شکل های پتاسیم
  • کانی شناسی
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