بررسی تاثیر اصلاح کننده آلی (کود دامی و بیوچار)‌ بر پایداری علفکش متری بیوزین در خاک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجو دکترا گروه علوم خاک دانشگاه علوم کشاورزی گرگان

2 دانشیار علوم خاک گرگان

3 استادیار گروه علوم خاک دانشگاه علوم کشاورزی گرگان

4 دانشگاه گلستان

5 دانشیار موسسه تحقیقات پنبه کشور

چکیده

کاربرد مداوم و نادرست علف­کش­ها می­تواند صدمات جبران­ناپذیری بر محیط زیست و زندگی موجودات زنده ایجاد کند. به همین علت آگاهی از پایداری علف­کش­ها در خاک، به سبب اهمیت تعیین پتانسیل آن­ها در آلوده کردن محیط و آسیب­رسانی به گیاهان زراعی امری ضروری به نظر می­رسد. این مطالعه با هدف بررسی تاثیر بیوچار و کود دامی بر پایداری علف­کش متری­بیوزین در شرایط اشباع و غیر اشباع خاک در قالب طرح کاملا تصادفی با آرایش فاکتوریل انجام شد. تیمارهای آزمایش شامل دو نوع ماده آلی اصلاح کننده (کود گاوی و بیوچار) و شرایط رطوبتی (اشباع و غیر اشباع) در ۷ زمان نمونه­برداری (صفر، 8، ۱۶، ۳۶، ۶۴، ۹۰و ۱۱۰ روز) بودند. نتایج اندازه­گیری غلظت علف­کش در تیمارها از زمان مصرف تا ۱۱۰ روز در هر دو حالت اشباع و غیر اشباع نشان داد که در تیمارهای دارای اصلاح کننده­های آلی، میزان کاهش غلظت علف­کش بیشتر از خاک شاهد بود. تجزیه علفکش در خاک مطابق تابع سینتیکی مرتبه اول بود. کمترین ضریب تجزیه (K) مربوط به تیمار شاهد و بیشترین ضریب تجزیه مربوط به تیمار اصلاح کننده بیوچار بود که بیانگر پایداری علف­کش در تیمار شاهد و تاثیر مثبت اصلاح­کننده آلی بر افزایش سرعت تجزیه علف­کش است. نیمه عمر محاسبه شده تیمارهای آزمایش در محدوده ۳۴ تا ۳۸ روز بود، بیشترین نیمه عمر (38 روز) مربوط به تیمار خاک شاهد در شرایط غیر اشباع و کمترین نیمه عمر (34 روز) در تیمار اصلاح کننده بیوچار در شرایط اشباع بود. نتایج آزمایش نشان داد تجزیه علف­کش در تیمارهای دارای اصلاح­کننده­های آلی در شرایط رطوبتی اشباع از غیراشباع بیشتر بود.

کلیدواژه‌ها


عنوان مقاله [English]

EEvaluation the effect of organic amendments (manure and biochar) on metribuzin herbicide persistence in soil.

نویسندگان [English]

  • Kolsoom Abdollahi 1
  • Seyed Alireza movahedi Naeini 2
  • Mojtaba BaraniMotlagh 3
  • Pooneh Ebrahimi 4
  • Ghorbanali Roshani 5
1 P.h.D Student, Department of Soil Science, Gorgan University
2 Associate Professor, Department of Soil Science, Gorgan University
3 Assistant Professor, Department of Soil Science, Gorgan University
4 Assistant Professor, Department of Chemistry, Golestan University
5 Associate Professor, Cotton Research institute of iran
چکیده [English]

Abstract
The continuous and incorrect application of herbicides can cause irreparable damage to the environment and life of living beings. Knowledge about the persistence of pesticides in soil is necessary due to the importance of identifying their potential for contamination of the environment and damage to crops. This study was conducted to investigate the effect of manure and biochar on the stability of metribuzin under saturated and unsaturated conditions in a completely randomized design with factorial arrangement. The treatments were two organic amendments (manure and biochar) and moisture condition (saturated and unsaturated) in 7 sampling times (0, 8, 16, 36, 64, 90 and 110 days). The results of measured concentration of herbicide in the treatments from the time of consumption up to 110 days in both saturated and unsaturated states showed that in treatments with organic amendments, reduced concentration of herbicide was higher than control soil. Degradation of herbicide followed first-order kinetics in the soil. A minimum degradation coefficient (k) was observed in control soil and maximum degradation coefficient was observed in biochar treatment that indicates the herbicide stability in control treatment and the positive effect of organic modifiers on increasing the rate of degradation of herbicide. The half-life of treatments was in the range of 34 to 38 days, maximum half-life (38 days) was related to the control soil in unsaturated condition and minimum half-life (34 days) was observed in biochar treatment in saturated moisture. The results of the experiment showed that degradation of herbicide in treatments with organic amendments under saturated moisture was higher than unsaturated condition.

کلیدواژه‌ها [English]

  • saturated soil"
  • "unsaturated soil"
  • "Half life"
  • "degradation rate"
  • "first-order kinetic"
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