ارزیابی آبشویی و روند تجزیه علف کش متری بیوزین در چند خاک مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان

1 هیئت علمی مجتمع آموزش عالی سراوان، سراوان، ایران

2 دانشیار، گروه علوم و مهندسی خاک، دانشکده مهندسی و فناوری کشاورزی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران

چکیده

مصرف بی­رویه و نادرست آفت­کش­ها سبب آلودگی محیط زیست شده است. بررسی سرنوشت علف­کش­های مصرف‌شده در خاک برای به حداقل رساندن تحرک آن­ها در خاک و کنترل آلودگی آب­های زیرزمینی ضروری می­باشد. آبشویی و تجزیه متری­بیوزین در سه خاک تحت شرایط آزمایشگاهی بررسی گردید. متری­بیوزین در ستون­های خاک با و بدون تیمار زمانی متحرک بود. تحرک علف­کش در خاک­ بستگی به فرایند جذب در همان خاک دارد. نتایج نشان داد که تحرک متری­بیوزین در خاک­های 7 و 5 (دارای کربن آلی کمتر) بیش از خاک­ 1 بود. اختلاف در تمایل جذبی متری­بیوزین بر روی خاک­های مختلف به علت تفاوت در خصوصیات خاک مانند مقدار رس، مقدار ماده آلی و میزان pH می­باشد. مقادیر نیمه­عمر در دامنه 92/37 تا 74/105 روز در شرایط استریل و غیراستریل محاسبه گردید. ترتیب ماندگاری متری­بیوزین در خاک­های 1، 5 و 7 می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of leaching and degradation rate of metribuzin herbicide in different soils

نویسندگان [English]

  • Mohammad Reza Rigi 1
  • Mohsen Farahbakhsh 2
1 Assistant professor of Higher Educational Complex of Saravan, Saravan, Iran
2 Associate Professor, Department of Soil Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

The intensive and inappropriate use of pesticides caused environment to be contaminated. Quantifying the fate of applied herbicides in the soil is essential for minimizing their mobility in the soil and environmental pollution. The leaching and degradation of the metribuzin herbicide in three soils were investigated under laboratory conditions. Metribuzin was mobile in the soils when tested using non-aged and aged soil columns. The mobility of herbicide in the soil is related to the adsorption phenomenon in the same soil. It was found that the mobility of metribuzin in the soils 7 and 5 (with less organic carbon) was more than the one in the soil 1. The difference in the adsorption affinity of metribuzin in different soils appears to be due to differences in soil properties, such as clay content, organic matter content and pH value. The calculated half-life values in sterile and non-sterile conditions ranged from 37.92 to 105.74 days. Metribuzin persistent in the soil was corresponded to columns 1, 5 and 7 respectively.

کلیدواژه‌ها [English]

  • "Pesticide"
  • "Triazine"
  • "Leaching"
  • "Degradation"
  • "Soil"
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