آبیاری با نسبت‌های مختلف پساب و اثرات آن بر خصوصیات شیمیایی خاک

نویسندگان

1 دانشیار بخش مهندسی آب، دانشکده آب و خاک، دانشگاه زابل

2 مدرس گروه کشاورزی دانشگاه پیام‌نور، تهران، ایران

چکیده

با توجه به لزوم استفاده مجدد از فاضلاب تصفیه شده برای کشاورزی در مناطق خشک و همچنین اهمیت تحقیقات در زمینه سرنوشت مواد اضافه شده به خاک توسط فاضلاب از نظر انتقال به عمق خاک، آزمایشی در زمینی به مساحت 40 متر، در قالب طرح فاکتوریل در سه تکرار در شهر کرمان در سال 1392انجام شد. تیمارهای مورد مطالعه شامل آبیاری، 100 درصد با آب چاه=1I، 50 درصد با آب چاه و 50 درصد با پساب=2I و 100 درصد با پساب =3I بودند. در این پژوهش دور آبیاری 6 روز و آبیاری به مدت 120 روز انجام پذیرفت. همچنین نمونه‌برداری از قسمت میانی هر کرت و در دو عمق 30-0 60-30 سانتی‌متر صورت گرفت. نتایج نشان‌دهنده کاهش میزان اسیدیته، افزایش شوری، افزایش نسبت جذب سدیم، افزایش فسفر فسفاتی، افزایش نیتروژن نیتراتی و افزایش تجمع فلزات سنگین خاک آبیاری شده با پساب در مقایسه با خاک آبیاری شده با آب چاه بود. همچنین میزان عناصر شیمیایی اندازه‌گیری شده در دو عمق مورد بررسی نشان داد که با افزایش عمق میزان اسیدیته و فلزات سنگین افزایش ولی میزان شوری، نسبت جذب سدیم، نیتروژن نیتراتی، فسفرفسفاتی و کربن آلی کل با افزایش عمق کاهش می‌یابند.

کلیدواژه‌ها


عنوان مقاله [English]

Irrigation by Different Levels of Wastewater and Its Effects on Soil Chemical Properties

نویسندگان [English]

  • Massoumeh Delbari 1
  • Rasoul Asadi 2
1 Associate Professor, Water Engineering Department, Faculty of Water and Soil, Zabol University
2 Lecturer of Department of Agriculture, Payame Noor University, Tehran, Iran.
چکیده [English]

Due to the necessity of wastewater reuse in arid regions and the necessity of investigation on the fate of added materials into the soil, a field experiment was carried out in 2013 at experimental farm in Kerman city. The treatments were laid out in split plot a Randomized Complete Block Design (RCBD) design with three replications. The treatments were comprised of I1: 100 percent of groundwater, I2: 50 percent of groundwater and 50 percent of wastewater and I3: 100 percent of wastewater. Irrigation period was 6 days and lasted for 4 months. Samplings were done for the middle part of furrows in two depths of 0-30 cm and 30-60 cm in every treatment. Results showed the reduction of pH, and increment of salinity, phosphate phosphorus, nitrate nitrogen and heavy metals of using wastewater compare to groundwater. Moreover, the results indicate the increasing of accumulation of heavy metals in soil depth applying furrow irrigation in comparison to drip irrigation.

کلیدواژه‌ها [English]

  • Groundwater
  • Wastewater
  • pH
  • Salinity
  • heavy metals
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