نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد گروه علوم و مهندسی خاک دانشکده کشاورزی دانشگاه تبریز

2 دانشیار گروه علوم و مهندسی خاک دانشکده کشاورزی دانشگاه تبریز

3 استادیار گروه علوم و مهندسی خاک دانشکده کشاورزی دانشگاه تبریز

چکیده

در آزمایشی گلخانه‌ای‌ جذب آهن و منگنز توسط دانهال‌های پسته (.Pistachio vera L) در رطوبت‌ و تراکم‌های مختلف بررسی گردید. این آزمایش در یک خاک آهکی با بافت لوم شنی در چهار‌ سطح‌ تراکمی (چگالی 35/1، 5/1، 65/1 و 8/1 گرم بر سانتی­متر مکعب)، شش سطح رطوبت از رطوبت اشباع تا نقطه پژمردگی دایم و در سه تکرار انجام شد. بعد از خروج ریشه‌ها از استوانه (90 روز) گیاهان برداشت، غلظت و مقدار آهن و منگنز اندازه‌گیری شد. این آزمایش آشیانه‌ای در قالب طرح کاملاً تصادفی اجرا گردید. افزایش تراکم خاک از 5/1 به 8/1 گرم بر سانتی‌متر مکعب سبب افزایش تقریبی 30 درصدی غلظت آهن ریشه و منگنز بخش هوایی و ریشه شد. افزایش سطوح تراکم خاک از 35/1 به 8/1 گرم بر سانتی‌متر مکعب مقدار آهن و منگنز بخش هوایی را به­ترتیب 74 و 64 درصد و مقدار آهن و منگنز ریشه را به­ترتیب 45 و 36 درصد کاهش داد. در تمام سطوح تراکمی کمبود آب تاًثیر منفی بر غلظت آهن بخش هوایی گذاشت، ولی افزایش غلظت منگنز بخش هوایی و ریشه در سطوح تراکمی 35/1 و 5/1 گرم بر سانتی‌متر مکعب همراه با تنش رطوبتی مشاهده شد. زیادی آب خاک سبب افزایش مقدار آهن و منگنز بخش هوایی و ریشه در سطح تراکمی 8/1 گرم بر سانتی‌متر مکعب گردید (p<0.05). همچنین افزایش مقدار آهن و منگنز ریشه در سطح تراکمی 65/1 گرم بر سانتی‌متر مکعب مشاهده شد (p<0.05).

کلیدواژه‌ها

عنوان مقاله [English]

Simultaneous Effects of Soil Compaction and Moisture on Fe and Mn Uptake by Pistachio (Pistachio vera L.) Seedlings

نویسندگان [English]

  • Ghazaleh Azizi 1
  • Adel Reyhanitabar 2
  • Davood Zarehagi 3
  • Nosratollah Najafi 2

1 Graduate student, Soil Science Department, Faculty of Agriculture, University of Tabriz

2 Associates Professor, Soil Science Department, Faculty of Agriculture, University of Tabriz

3 Assistant professor Soil Science Department, Faculty of Agriculture, University of Tabriz

چکیده [English]

A greenhouse experiment was carried out to study the uptake of Fe and Mn in pistachio seedlings (Pistachio vera L.) at different densities and moisture levels. This experiment was applied in a sandy loam soil with four levels of bulk density (1.35, 1.5, 1.65 and 1.8 g cm-3) and six moisture levels from saturation to the permanent wilting point in triplicates. After outbreak the roots (90 days) from cylinders, seedlings were harvested and analyzed for their Fe and Mn. The experiment was conducted in a completely randomized design based nesting. Increasing soil density from 1.5 to 1.8 g/cm3 resulted in almost 30 percent increase in roots Fe concentration and root and shoot Mn concentration. An increase in soil density from 1.35 to 1.8 g cm-3 decreased 74 and 64 percent the shoot iron and manganese contents and decreased 45 and 36 percent root iron and manganese, respectively. Water deficiency at all bulk density levels had a negative impact on shoot Fe concentration , but an increase in Mn concentration was observed in shoot and root at bulk density levels of of 1.35 and 1.5 (g cm-3) with water stress. High soil water content increased Fe and Mn contents in shoot and root at bulk density level of 1.8 (g cm-3) (p<0.05). It also increased (p<0.05) the Fe and Mn content in root at density level of 1.65 (g cm-3).

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