مقایسه ویژگی‏های جذب پتاسیم در خاک‏های زراعی و غیرزراعی منطقه خوی

پیغامی خوشه‏ مهر, حسن; سپهر, ابراهیم; ممتاز, حمیدرضا

مقایسه ویژگی‏های جذب پتاسیم در خاک‏های زراعی و غیرزراعی منطقه خوی

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی کارشناسی ارشد گروه علوم خاک دانشکده کشاورزی دانشگاه ارومیه

² دانشیار گروه علوم خاک، دانشکده کشاورزی دانشگاه ارومیه

³ استادیارگروه علوم خاک، دانشکده کشاورزی دانشگاه ارومیه

چکیده

بهمنظور مقایسه رفتار جذب پتاسیم در خاکهای زراعی و غیر زراعی در منطقه خوی، آزمایشات جذب بهصورت بچبا 10 نمونه خاک زراعی و 10 نمونه خاک غیرزراعی در سری غلظتی پتاسیم mg L^-1)150-0) در قدرت یونی 01/0 مولار CaCl₂ انجام گرفت. پس از تعادل، مقدار پتاسیم باقیمانده در محلول اندازهگیری و منحنیهای کمیت به شدت (Q/I) رسم و پارامترهای ظرفیت بافری بالقوه پتاسیم ((PBC^K، نسبت فعالیت تعادلی پتاسیم (AR_e^K)، پتاسیم آسان قابل تبادل (∆K₀)، نیاز استاندارد پتاسیم (SKR)، غلظت تعادلی پتاسیم (EKC)، پتاسیم سخت قابل تبادل (K_X) و انرژی تبادلی پتاسیم (EK) از روی منحنیهای کمیت-شدت (Q/I) محاسبه شدند. نتایج مقایسه میانگین پارامترهای خاکهای زراعی و غیرزراعی نشان داد که مقادیر پارامترهایEKC، AR_e^K و ∆K₀ در خاکهای زراعی نسبت به مقدار آنها در خاکهای غیرزراعی مجاور کاهش معنی‌داری (p≤0.01) داشتند، به طوری که با روند کشت، میانگین مقدار AR_e^K از 0188/0 به 0048/0 ^0.5(mol.L^-1) و میانگین ∆K₀ از 117/0 به 057/0 cmol_c.kg^-1 کاهش یافتند. مقدار متوسط پارامتر EKC در خاکهای غیرزراعی و زراعی بهترتیب 91 و 34 میلیگرم بر لیتر و میانگین PBC^Kبرای خاکهای زراعی 8/11 و غیرزراعی 7/7 cmol_c.kg^-1/(mol.L^-1)^0.5 بهدست آمد. در نهایت میتوان نتیجهگیری کرد که خاکهای منطقه مورد مطالعه، بهطور نسبی دارای پتاسیم بالایی میباشند، ولی مدیریت کشت منطقه و نحوه مدیریت کودی زارعین منجر به کاهش میزان پتاسیم در خاک و در نتیجه افزایش پارامترهای جذب در خاک‌های زراعی شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of potassium sorption characteristics of cultivated and virgin soils in Khoy region

نویسندگان [English]

Hasan Peyghami Khoshemehr ¹
Ebrahim Sepehr ²
HamidReza Momtaz ³

¹ MSc Student, Department of Soil Science, Urmia University, Iran

² Associate Professor, Department of Soil Science, Urmia University, Iran

³ Assistant Professor, Department of Soil Science, Urmia University, Iran

چکیده [English]

The present study was conducted to study of potassium sorption behavior of soil in Khoy region. Sorption isotherm was constructed in the laboratory by equilibrating and shaking 2.5 g soil with 25 ml of 0.01 mM CaCl₂ containing 0-150 mg K L^-1 as KCl for 24 h. After equilibrium, remaining concentration of potassium measured and potassium Quantity-Intensity (Q/I) curves and their parameters such as potassium buffering capacity (PBC^K،( potassium activity ratio at equilibrium (AR_e^K), readily exchangeable K (∆K₀), standard potassium requirement (SKR), equilibrium potassium concentration (EKC) and energy of exchange (E_K) were calculated. Mean comparison of paired soil samples indicated that the AR_e^K, EKC and ∆K₀ values of cultivated soils were significantly (p≤0.001) lower than those of virgin soils, indicating decreasing of potassium in the cultivated soils. As with cultivation, AR_e^K mean decreased from 0.0188 to 0.0048 (mol.L^-1)^0.5 and ∆K₀ mean decreased from 0.117 to 0.057 cmol_c kg^-1. Mean of equilibrium potassium concentration (EKC) in virgin and cultivated soils was 91 and 34 mg.l^-1 respectively and PBC mean for cultivated and virgin soils measured 11.8 and 7.7 cmol_c.kg^-1/(mol.L^-1)^0.5 respectively. It was concluded that soils of studied region have relatively sufficient potassium for plants but cultivation and fertilizer management lead to a reduction in the amount of potassium in soils and increasing the adsorption parameters.

کلیدواژه‌ها [English]

Adsorption isotherms
Potassium
Quantity – intensity relationship
Potassium buffering

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