توزیع شکلهای مختلف روی و ارتباط آنها با ویژگیهای خاک در برخی خاک‌های آهکی استان تهران
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Abstract:
Information about forms of zinc (Zn) is important for the evaluation of its status in soil and also understanding of the soil fertility and chemistry. To obtain such information, amounts and distribution of Zn in different fractions of 20 soil samples of Tehran province, Iran were determined by sequential extraction method and their relationships with each other and with soil characteristics were investigated. Total Zn of soils ranged from 70 to 169.9 mg/kg-1. The amount of different Zn forms relative to the sum of forms was determined to be as follows: organic less than 0.1, soluble+exchangeable 0.1, manganese-oxide-associated 0.9, carbonate 1.6, crystalline iron-oxide-associated 3.8, amorphous iron-oxide-associated 4.2, and residual form 89.3%. Simple correlation coefficients showed that pH had a negative significant correlation with all forms of Zn except organic. Silt and clay contents had significant positive correlations with total, residual, and crystalline iron-oxide-asociated Zn but CEC had significant correlation only with total Zn. Calcium carbonate equivalent showed a significant correlation with soluble+exchangeable, manganese-oxide-associated and amorphous iron-oxide-associated Zn. DTPA-extractable Zn was significantly correlated with soluble+exchangeable, carbonate, and amorphous iron-oxide-associated Zn. A significant correlation was also observed between the Zn forms themselves, which is presumably a reflection of the existence of a dynamic relation between the chemical forms of an element in soil.
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توزیع شکل های مختلف روی و ارتباط آنها با ویژگی های خاک در برخی خاک های آهکی استان تهران
شناخت شکل های مختلف روی در خاک، اطلاعات مفیدی برای ارزیابی وضعیت روی و نیز حاصلخیزی خاک و تغذیه گیاه در اختیار می گذارد. به منظور کسب چنین اطلاعاتی، روی کل و توزیع آن در شکل های مختلف در 20 نمونه خاک استان تهران به روش عصاره گیری دنباله ای تعیین و رابطه این شکل ها با یکدیگر و با ویژگی های خاک مطالعه شد. میزان روی کل 70 تا 9/169 میلی گرم بر کیلوگرم خاک به دست آمد. به طور متوسط روی متصل به مواد آ...
full textشکلهای مختلف فسفر در برخی خاک‌های آهکی استان فارس و رابطه آنها با ویژگیهای فیزیکوشیمیایی خاک
Knowledge of forms of phosphorus (P) is important in the evaluation of soil P status and also in understanding soil genesis and fertility. Amounts and distribution of P in different organic and inorganic fractions were examined in 39 soil samples of Fars province. Soils were sequentially extracted to determine organic P and inorganic P fractions. Total P with an average of 597 mg/kg soil was ...
full textشکلهای مختلف فسفر در برخی خاک‌های آهکی استان فارس و رابطه آنها با ویژگیهای فیزیکوشیمیایی خاک
Knowledge of forms of phosphorus (P) is important in the evaluation of soil P status and also in understanding soil genesis and fertility. Amounts and distribution of P in different organic and inorganic fractions were examined in 39 soil samples of Fars province. Soils were sequentially extracted to determine organic P and inorganic P fractions. Total P with an average of 597 mg/kg soil was ...
full textتوزیع شکلهای نیتروژن در خاک‌های آهکی تحت کشت استان فارس و رابطه آنها با ویژگیهای خاک
Twenty-five surface samples of calcareous soils of Fars Province were used to study the distribution of different nitrogen (N) forms to determine the relationship between the N forms and soil charcteristics, and to obtain regression equations for prediction of N forms from soil characteristics. The forms determined were: soil total nitrogen NO3-N by phenol disulfunic acid NO3-N extractable by 2...
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Journal title
volume 10 issue 3
pages 125- 136
publication date 2006-10
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