ارتباط بین اشکال پتاسیم با ویژگی‌های فیزیکوشیمیایی و تنوع کانی‌های رسی برخی از خاک‌های خوزستان

نوع مقاله: مقاله پژوهشی

نویسنده

دانشیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران

چکیده

آگاهی از اشکال مختلف پتاسیم و توزیع آن در خاک‌های مختلف می­تواند به مصرف بهینه کودهای پتاسیم کمک نماید. پژوهش حاضر با هدف بررسی اشکال مختلف پتاسیم در خاک و همبستگی آن‌ها با ویژگی­های فیزیکی و شیمیایی و کانی­های رسی خاک انجام گردید. نتایج نشان داد که میزان پتاسیم محلول با میزان رس­ رابطه معکوس و میزان پتاسیم تبادلی و قابل جذب با میزان رس­ رابطه مستقیم داشت. میزان پتاسیم تثبیت شده نیز به نوع و مقدار رس­ها در خاک بستگی داشت. پتاسیم ساختمانی با میزان آهن و میزان رس در خاک، رابطه مثبت و معنی­داری نشان داد اما با میزان گچ در خاک رابطه منفی داشت. پتاسیم کل بنابه همبستگی­ که با میزان رس داشت با میزان آهن، آلومینیم و سیلیس نیز که اجزاء اصلی تشکیل دهنده رس­ها می­باشند، نیز همبستگی بالایی داشت. میزان پتاسیم خاک به میزان زیادی با افزایش کانی‌های ایلیتی رو به فزونی بود ولی وجود پالی­گورسکایت یا کلریت زیاد در خاک با کاهش میزان پتاسیم در خاک همراه بود. نتایج نشان داد که میزان پتاسیم با وجود گچ، آهک و ماده آلی و بدون حضور این مواد در مناطق حاوی گچ مثل امیدیه، رامهرمز و هفتکل تفاوت قابل ملاحظه­ای داشت. عمده تفاوت در میزان پتاسیم خاک به نوع کانی‌های رسی (متأثر از مواد مادری)، اثرات آبیاری سنگین، جذب گیاهی و میزان گچ مرتبط بود که سبب می­شد کانی رسی ایلیت تا حدودی در خاک کاهش یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Correlation Among K Forms with Soil Physical-Chemical Properties and Clay Mineral Diversity in Some Soils of Khuzestan

نویسنده [English]

  • siroos jafari
Associate professor of soil science,Agriculture college, Agriculture and Natural Resources University of Khouzestan, mollasani, ahvaz, Iran
چکیده [English]

The knowledge about K forms and its distribution in different soils can help to apply properly K fertilizers. This study was performed to investigate the different K forms in the soil and their relationship with physical-chemical properties and clay mineral diversity of the soil. The results showed that the amount of soluble K had negative correlation with clay content but exchangeable or available K value had positive correlation with clay content. Also, the fixed K value had good correlation with type and among clay content in these soils. Structural K had positive and significant correlation with Fe and clay content but negative correlation with gypsum. Total K had good correlation with clay content and consequently with Fe, Al, and Si that are the main performed elements of the clay particles. The amount of K in the soil was increased with increasing of illite content but it was decreased with increasing the chlorite and palygorskite. The results showed a significant difference between the K values with the presence and absence of OM, CCE, and gypsum in the soils. Generally speaking, the available K content was corresponded to the parent material (clay mineral type), cultivation type and age, heavy irrigation and leaching which causes a reduction in illite clay mineral in these soils.

کلیدواژه‌ها [English]

  • clay
  • mineralogy
  • potassium
  • fixation
  • release
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