اثر لجن فاضلاب بر برخی ویژگی‌های فیزیکی و شیمیایی خاک و عملکرد گندم

نویسندگان

1 دانش آموخته کارشناسی ارشد محیط‌زیست، دانشکده منابع طبیعی و کویرشناسی، دانشگاه یزد

2 استادیار گروه خاک‌شناسی، دانشکده منابع طبیعی و کویرشناسی، دانشگاه یزد

3 استادیار گروه مدیریت مناطق خشک و بیابانی، دانشکده منابع طبیعی و کویرشناسی، دانشگاه یزد

4 استادیار گروه عمران، دانشکده فنی و مهندسی، دانشگاه یزد

چکیده

لجن فاضلاب یکی از منابع مهم مواد آلی، نیتروژن، فسفر و دیگر مواد غذایی است که با مدیریت مناسب می­تواند به عنوان یک کود آلی در بهبود و باروری خاک مورد استفاده قرار گیرد. در این تحقیق به منظور بررسی تأثیر لجن فاضلاب بر عملکرد دو رقم گندم سیوند و روشن و برخی ویژگی­های فیزیکی و شیمیایی خاک، آزمایشی در قالب طرح کاملا" تصادفی به صورت فاکتوریل با سه تکرار و سه سطح لجن (صفر، 60 و 120 گرم بر کیلوگرم خاک) در گلخانه تحقیقاتی دانشگاه یزد اجرا گردید. نتایج نشان داد که کاربرد لجن فاضلاب در مقایسه با تیمار شاهد باعث افزایش معنی­دار سطح برگ، وزن خشک اندام هوایی، تعداد دانه و وزن کل دانه دو رقم مورد مطالعه شد، اما ارتفاع گیاه رقم روشن در تیمار شاهد بیشتر از تیمارهای لجن فاضلاب بود. با افزایش سطح کاربرد لجن فاضلاب، هدایت­الکتریکی خاک نیز افزایش یافت، در حالی که pH خاک و چگالی ظاهری خاک در سطوح 60 و 120 گرم بر کیلوگرم لجن در مقایسه با تیمار شاهد کاهش معنی­داری نشان داد. همچنین تیمارهای لجن فاضلاب در مقایسه با تیمار شاهد باعث افزایش معنی­دار درصد کربن آلی، نیتروژن کل، فسفر و پتاسیم قابل جذب خاک شد. با توجه به نتایج این تحقیق، لجن فاضلاب از طریق بهبود برخی ویژگی­های فیزیکی و شیمیایی خاک می­تواند باعث حاصلخیزی خاک و افزایش عملکرد گیاه شود.

کلیدواژه‌ها


عنوان مقاله [English]

The Effects of Sewage Sludge on Some Physical and Chemical Properties of Soil and Wheat Yield

نویسندگان [English]

  • F Shahbazi 1
  • S Ghasemi 2
  • H Sodaeizadeh 3
  • H Pourdara 3
  • K Ayaseh 4
1 M.Sc. Graduate of Environment., Faculty of Natural Resources& Desert Studies., Yazd Univ, Iran
2 Assist. Prof., Dept. of Soil Science., Faculty of Natural Resources & Desert Studies., Yazd Univ,Iran
3 Assist. Prof., Dept. of Management in the Arid Regions., Faculty of Natural Resources & Desert Studies., Yazd Univ, Iran
4 Assist. Prof., Dept. of Civil Engineering., Faculty of Engineering., Yazd Univ,Iran
چکیده [English]

Sewage sludge is an important source of organic matter, nitrogen, phosphorus and other nutrients. This sludge can be used as an organic fertilizer to improve the soil and it’s fertility by a correct management. In present study an investigation was carried out in order to checking the effects of sewage sludge on yield of two types of wheat species (Sivand and Roshan) and some physical and chemical properties of  the soil.The investigation was done in the form of a factorial experiment as a completely randomized design with three replications and three levels of sludge(zero, 60 and120 g kg-1soil) in research greenhouse of  the Yazd University. The results showed that application of sewage sludge comparing control treatment caused a significant increase in the leaf surface, dry weight of aerial parts, seed number and total seed weight in the Sivand and Roshanas the two studied varieties, although the Roshan wheat height in control treatment was more than that is sewage sludge treatments. With increasing the level of sewage sludge, soil electrical conductivity increased too.While, soil pH and soil bulk dencity at treatment with 60 and 120g kg-1 of sludge showed a significant decrease  as compared to the control treatment. Furthermore, the treatments of sewage sludge in comparison with control treatment increased  the organic carbon, total nitrogen, phosphorus and absorbable potassium of the soil. According to the results, sewage sludge could increase soil fertility and plant yield by improving some physical and chemical properties of  the soil.                                             

کلیدواژه‌ها [English]

  • Arid and semi-arid regions
  • Food stuffs
  • Roshan wheat
  • Sewage sludge
  • Sivand wheat
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