برهمکنش نیکل و آهن بر برخی صفات زراعی گیاه ذرت(Zea mays L.) در یک خاک آهکی

نویسندگان

1 دانشیار گروه علوم و مهندسی خاک، دانشکده کشاورزی دانشگاه تبریز

2 دانش آموخته کارشناسی ارشد گروه علوم و مهندسی خاک، دانشکده کشاورزی دانشگاه تبریز

چکیده

نیکل (Ni) یکی از عنصر‌های اخیرا اضافه شده به فهرست عناصر ضروری کم‌‍‌‌مصرف برای گیاهان است. از طرف دیگر تجمع نیکل در خاک‌ و گیاهان در غلظت‌های بالا، نگرانی برای سلامت بشر و سایر موجودات زنده را افزایش داده است. برای مطالعه اثر مصرف توام نیکل و آهن بر برخی صفات زراعی گیاه ذرتZea mays L.) ) در یک خاک آهکی با بافت متوسط، آزمایشی به‌صورت فاکتوریـل و در قالب طرح بلـوک‌هـای کامـل تصادفی در شرایط گلخانه‌ای در سه تکرار انجام گرفت. فاکتورها شامل مقدار نیکل مصرفی در چهار سطح (0، 10، 50 و 100 میلی‌گرم نیکل بر کیلوگرم خاک) از منبع سولفات نیکل خالص(NiSO4.6H2O)  و آهن در پنج سطح (0، 10 و 20 میلی‌گرم آهن بر کیلو گرم خاک) از دو منبع سولفات آهن (FeSO4.7H2O) و سکوسترین (FeEDDHA) تجاری بودند. بر طبق نتایج حاصله در سطوح 50 و 100 میلی‌گرم نیکل بر کیلوگرم خاک، وزن خشک بخش هوایی به ترتیب 2/16 و 9/31 درصد و وزن خشک ریشه به ترتیب 5/28 و 8/30 درصد نسبت به شاهد کاهش یافت. ارتفاع ساقه در حضور 100 میلی‌گرم نیکل بر کیلوگرم خاک، 14 درصد  و شاخص کلروفیل در سطوح 50 و 100 میلی‌گرم نیکل، نسبت به شاهد به ترتیب 4/32 و 5/40 درصد کاهش یافت. افزایش سطوح آهن مصرفی از هر دو منبع مورد استفاده باعث افزایش معنادار وزن خشک بخش هوایی ذرت شد. اما وزن خشک بخش هوایی در سطح 20 میلی‌گرم آهن از منبع سکوسترین با افزایش نیکل از 10 به 50 میلی‌گرم و همچنین از 50 به 100 میلی‌گرم به‌ترتیب 9/81 و 29 درصد کاهش یافت.

کلیدواژه‌ها


عنوان مقاله [English]

The Interactive Effects of Nickel and Iron on Some Agronomic Traits of Corn (Zea mays L.) in a Calcareous Soil

نویسندگان [English]

  • A Reyhanitabar 1
  • M Eydi 2
  • N Najafi 2
1 Assoc. Prof., Soil Sci. Dept., Faculty of Agric., Univ. of Tabriz, Iran
2 Former M.Sc. Student, Soil Sci. Dept., Faculty of Agric., Univ. of Tabriz, Iran
چکیده [English]

Nickel (Ni) is an element that has recently been added to the list of essential micronutrients of plants. On the other hand, accumulation of Ni in soils and plants has increased concerns about humans and other living organisms for toxicity of Ni. To study the effect of Ni and iron (Fe) on the growth characteristics of corn (Zea maysL.) plant in the soil a factorial experiment on the basis of randomized complete blocks design with three replications was carried out under greenhouse condition in a calcareous soil. The factors included the concentration of the applied Ni at four levels (0, 10, 50 and 100 mg Ni kg-1 soil) as pure nickel sulfate (NiSO4.6H2O) source and Fe at five levels of 0, 10 and 20 mg Fe kg-1 soil, as iron sulfate (FeSO4.7 H2O) and commercial Fe sequestrene (FeEDDHA). According to the results, at the applied levels of 50 and 100 mg Ni kg-1 soil, the shoot dry weight was decreased by 21.1 and 31.9%, and the relevant decrease of root dry weight was 30.8 and 28.5% respectively, as compared to the control. Stem height was decreased by 2.1% in the presence of 100 mg Ni kg-1 soil, as compared to the control. Chlorophyll index was decreased by 32.4 and 40.5% in levels of 50 and 100 mg Ni kg-1 soil, respectively, as compared to the control. Increasing Fe levels of the two applied Fe sources significantly increased the shoot dry weight. But the shoot dry weight was decreased by 81.9 and 29% at 20 mg Fe level of Fe-EDDHA, as Ni was increased from the levels of 10 to 50 mg and from 50 to100 mg, respectively.

کلیدواژه‌ها [English]

  • Corn
  • Calcareous soil
  • Interaction
  • Iron
  • Nickel
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