اثر مواد آلی و شوری بر توزیع شکل های شیمیایی روی در یک خاک آهکی پس از کشت ذرت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار دانشکده کشاورزی و منابع طبیعی داراب، دانشگاه شیراز

2 دانشیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز

3 استادیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز

4 استاد سابق گروه علوم خاک، دانشکده کشاورزی، دانشگاه شیراز

چکیده

اطلاع از توزیع شکل­های شیمیایی روی در خاک­های آهکی جهت شناخت زیست­فراهمی و تحرک آن ضروری است. به منظور بررسی اثرات شوری و ماده آلی بر شکل­های شیمیایی روی در یک خاک آهکی تحت کشت ذرت، آزمایشی فاکتوریل در قالب طرح کاملاً تصادفی در سه تکرار در شرایط گلخانه انجام شد. فاکتورها شامل سه سطوح شوری (0، 15 و 30 میلی­اکی والان نمک در کیلوگرم خاک) و دو نوع ماده آلی ( کود گاوی و کاه-کلش گندم) هر کدام در دو سطح ( 0 و 2 درصد وزنی) بود. اندازه­گیری شکل­های شیمیایی روی از طریق روش عصاره­گیری دنباله­ای سینگ و همکاران انجام شد. نتایج نشان داد که با افزایش سطوح شوری، غلظت شکل­های محلول+ تبادلی، کربناتی و اکسیدمنگنز روی افزایش و شکل آلی کاهش یافت. کاربرد مواد آلی سبب افزایش غلظت شکل­های محلول+ تبادلی، کربناتی، آلی، پیوسته به اکسید منگنز و اکسید آهن بلورین شد. کاربرد تیمارهای آلی درصد نسبی شکل­های محلول+ تبادلی، آلی، کربناتی، اکسید منگنز و اکسیدی آهن را افزایش و درصد نسبی شکل تتمه را کاهش داد. تیمار شوری درصد نسبی شکل­های محلول+ تبادلی، کربناتی و اکسید منگنز را افزایش، و شکل های آلی و اکسید آهن بلورین را کاهش داد. بنابراین کاربرد ماده آلی و شوری سبب توزیع مجدد شکل­های شیمیایی روی شد. همچنین، همبستگی مثبت و معنی­داری بین شکل­های محلول+ تبادلی، کربناتی، اکسید منگنز و اکسید آهن با روی قابل جذب در خاک وجود داشت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Salinity and Organic Matter on Distribution of Zinc Chemical Forms in a Calcareous Soil after Maize Cultivation

نویسندگان [English]

  • HR Boostani 1
  • M Chorom 2
  • A Moezzi 2
  • N Enayatizamir 3
  • N Karimian 4
چکیده [English]

Information about forms of zinc (Zn) in calcareous soils is essential for understanding its bioavailability and mobility. To investigate the effects of salinity and organic matter on the chemical forms of Zn in a calcareous soil under maize cultivation, a factorial experiment as completely randomized design with three replications was conducted in greenhouse conditions. Factors included three salinity levels (0, 15 and 30 meq salt kg-1 soil) and two types of organic matter (manure and wheat straw), each of them at two levels (0 and 2 percent). Sequential extraction procedure of Singh et al. was used to measure Zn chemical forms. Results showed that the Zn concentrations of soluble+ exchangeable, carbonatic, mn-oxide fractions were increased and Organic fraction was decresed by increasing of salinity levels. Application of the all organic treatments caused to increase the Zn concentrations of soluble+ exchangeable, carbonatic, organic, mn-oxide and fe-oxide fractions. The Zn concentration of residual fraction in wheat straw treatment was reduced. The relative percentage of soluble + exchangeable, organic, carbonatic, mn-oxide and fe-oxide fractions were increased and residual fraction was decreased by application of all organic treatments. Salinity caused to increase the relative percentage of soluble+exchangeable, carbonatic and mn-oxide fractions and to reduce the organic and crystalline fe-oxide fractions. Therefore, application of salinity and organic matter caused to redistribution of Zn chemical fractions. Also, the available Zn in soil had a positive and significant correlation with soluble+exchangeable, carbonatic, mn-oxide and fe-oxide fractions.

کلیدواژه‌ها [English]

  • Calcareous soil
  • Chemical forms
  • Organic matter
  • salinity
  • Zinc
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