سینتیک آزاد شدن روی و مس در خاک آهکی تیمار شده با کود‌ دامی و ورمی‌کمپوست

نوع مقاله : مقالات پژوهشی

نویسندگان

• حمیدرضا متقیان ¹
• علیرضا حسین پور ²
• شهرام کیانی ¹

¹ دانشگاه شهرکرد

² شهرکرد

https://doi.org/10.22067/jsw.v30i2.42565

چکیده

مصرف کودهای آلی مانند ورمی‌کمپوست یکی از راه‌های افزودن عناصر به خاک‌های کشاورزی با ماده‌ آلی کم است. با این وجود، مصرف این کود می‌تواند بر ویژگی‌های آزاد شدن عناصر کم‌نیاز مؤثر باشد. در این تحقیق سرعت آزاد شدن روی و مس در یک خاک آهکی تیمار شده با سطوح 0، 5/0 و 1 درصد (وزنی- وزنی) کود گاوی و ورمی‌کمپوست در قالب طرح کاملاً تصادفی مقایسه شد. نمونه‌های خاک به‌روش عصاره‌گیری متوالی و با استفاده از DTPA-TEA در دمای 1± 25 درجه سانتی‌گراد به‌مدت 1 تا 504 ساعت عصاره‌گیری شدند. نتایج نشان داد که مقدار روی آزاد شده در خاک‌های تیمار شده با کود گاوی و ورمی‌کمپوست افزایش معنی‌داری (05/0 ‌p) و در خاک تیمارشده با ورمی‌کمپوست کاهش معنی‌داری (05/0 < p) نسبت به خاک شاهد داشت. همچنین، مقدار روی و مس آزاد شده در خاک‌های تیمار شده با ورمی‌کمپوست در مقایسه با خاک‌های تیمار شده با کود گاوی کاهش معنی‌داری (05/0 < p) یافت. مقدار روی آزاد شده در خاک‌های تیمار شده با 5/0 و 1 درصد کود گاوی و ورمی‌کمپوست به‌ترتیب 54/2، 98/2، 14/2 و 61/2 میلی‌گرم در کیلوگرم بود. مقدار مس آزاد شده در خاک‌های تیمار شده با 5/0 و 1 درصد کود گاوی و ورمی‌کمپوست به‌ترتیب 92/2، 72/2، 41/2 و 40/2 میلی‌گرم در کیلوگرم بود. معادله تابع توانی بهترین مدل توصیف کننده مکانیسم آزاد شدن روی و مس در خاک‌های مورد مطالعه بود. همچنین، سرعت آزاد شدن روی و مس در خاک تیمار شده با ورمی‌کمپوست کمتر از خاک تیمار شده با کود گاوی بود. نتایج این تحقیق نشان داد که مقدار و سرعت آزاد شدن روی و مس در خاک تیمار شده با ورمی‌کمپوست در مقایسه با خاک‌های تیمار شده با ماده مورد استفاده در تهیه ورمی‌کمپوست (کود گاوی)، کاهش می‌یابد.

کلیدواژه‌ها

• تابع توانی
• عصاره‌گیری متوالی
• عناصر کم‌نیاز
• کود آلی

20.1001.1.20084757.1395.30.2.8.0

عنوان مقاله [English]

Zinc and Copper Release Kinetics in a Calcareous Soil amended with Manure and Vermicompost

نویسندگان [English]

• hamid reza motaghian ¹
• alireza hosseinpuor ²
• Shahram Kiani ¹

¹ Shahrekord University

²

چکیده [English]

Introduction: Use of organic fertilizers such as vermicompost in agricultural soils with low organic matter content is almost considered as a one way for adding nutrients in these soils. However, application of these fertilizers may affect micronutrient release characteristics. Micronutrient release Kinetics in soils especially in amended soils give information about potential of amended soils to release these elements into solution. Although it is important to study kinetics of micronutrient release from soils to identify soil micronutrients buffering capacity, little attention has been paid to micronutrients desorption rate studies especially in amended soils. The rate of release micronutrients from soil solid phase by considering micronutrients as adsorbed ions or in mineral forms is an important parameter in nutrition of plants by microelements and a dynamic factor that regulates its continuous supply to growing plants; nonetheless, little attention has been paid to micronutrients kinetics inrelease studies.
Material and Methods: In this study, kinetics of zinc (Zn) and copper (Cu) were compared in one calcareous soil amended with 0, 0.5, and 1% (w/w) of manure and vermicompost in a completely randomized design and then amended and un-amended soils were incubated at field capacity, for 30 days. After incubation period, amended and un-amended soils were air-dried and were prepared to kinetics study. Kinetics of Zn and Cu release were studied by successive extraction with DTPA-TEA solution. Two grams of the amended and un-amended soils, in triplicate, suspended in 20 ml DTPA-TEA solution were equilibrated at 25±10C for 1, 8, 24, 48, 72, 96, 120, 144, 168, 336 and 504 h by shaking for 15 min. before incubation and 15 min. before the suspensions were centrifuged. Seven drops of toluene were added to each 1000 ml of extractant to inhibit microbial activity. Zinc and copper desorption with time was fitted by using different equations (Zero-order, First-order, Parabolic diffusion, Simplified Elovich, and Power function).
Results and Discussion: Results showed that released Zn in soils amended with manure and vermicompost compared to control soil significantly increased (p0.05) and released Cu in soil amended with vermicompost decreased significantly (p

کلیدواژه‌ها [English]

• Micronutrient
• Organic fertilizer
• Power Function
• Succecive Extraction

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