بررسی شکل‌های شیمیایی روی در خاک آهکی زیر کشت انار و بادام

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، بخش علوم خاک، دانشکده کشاورزی، دانشگاه شیراز

2 دانشیار، بخش علوم خاک، دانشکده کشاورزی، دانشگاه شیراز

چکیده

روی از مهمترین عناصر کم نیاز برای گیاهان می­باشد که قابلیت دسترسی آن در خاک­های آهکی کم است. قابلیت دسترسی روی برای گیاه به توزیع نسبی شکل­های مختلف شیمیایی آن در خاک بستگی دارد که تابعی از ویژگی­های خاک می­باشد. پژوهش  حاضر به منظور بررسی توزیع شکل­های شیمیایی روی در دو نوع خاک زیر کشت درختان بادام و انار با استفاده از روش عصاره­گیری دنباله­ای انجام گردید. نتایج نشان داد مقدار روی قابل استخراج با DTPA در خاک زیر کشت بادام نسبت به انار در خاک سطحی- زیر سایه انداز 10/12% و در خاک سطحی- خارج از سایه­انداز 91/9% می­باشد، خاک عمقی- زیر سایه انداز 20/19% و در خاک عمقی- خارج از سایه­انداز 67/21 % بیشتر گردید. مقدار روی قابل استفاده در خاک سطحی- زیر سایه­انداز نسبت به خارج از سایه­انداز درختان انار 71/9% و در خاک عمقی- زیر سایه­انداز نسبت به خارج از سایه­انداز درختان انار 18/10% بیشتر گردید. نتایج نشان داد بیشترین درصد شکل شیمیایی روی در روش عصاره­گیری دنباله­ای مربوط به شکل کل و سپس اکسیدهای آهن بی­شکل بوده که قابل دسترس برای درختان نیست. به طور کلی ترتیب شکل­های شیمیایی روی به لحاظ کمیت به ترتیب زیر بود: محلول + تبادلی

کلیدواژه‌ها


عنوان مقاله [English]

Investigating Zn Chemical Forms in Calcareous Soils under Cultivation of Pomegranate and Almonds

نویسندگان [English]

  • Z. Dianat Maharluei 1
  • R. Ghasemi 2
1 MSc Graduate, Soil Science, School of Agriculture, University of Shiraz
2 Associate Professor, Soil Science, School of Agriculture, University of Shiraz
چکیده [English]

Zinc (Zn) is one of the most important nutrient elements for plants, but its availability in calcareous soils is low. The availability of Zn for plants depends on relative distribution of its chemical forms in the soil, which is dependent on soil properties. The present research was conducted to investigate the distribution of chemical forms of Zn in two soils under almond and pomegranate trees using sequential extraction procedure. Results showed that the amount of DTPA extractable Zn in the surface soil under-canopy, surface soil-interspaces, subsurface soil under-canopy, and subsurface soil-interspaces were higher for almond cultivation compared to pomegranate by 12.10%, 9.91%, 19.20%, and 21.67%, respectively. The amount of available Zn on the surface soil under-canopy was higher compared to the interspaces of pomegranate trees by 9.71% and in subsoil under-canopy was higher in comparison with interspaces by 10.18%. The results showed that residual form was the highest chemical fraction of Zn followed by the Zn associated with iron oxides forms which are not available to trees. Generally, the amounts of the chemical forms of Zn were as follows: Soluble+exchangeable < organic-bound

کلیدواژه‌ها [English]

  • Organic Matter
  • Tree canopy
  • Surface soil
  • Sequential extraction
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