اثر ماده آلی بر سینتیک تثبیت فسفر در چند خاک مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری گروه مهندسی علوم خاک دانشکدة مهندسی و فناوری کشاورزی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران

2 دانشیار گروه مهندسی علوم خاک دانشکدة مهندسی و فناوری کشاورزی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران

چکیده

در این بررسی اثر ماده آلی بر سینتیک تثبیت فسفر در چهار خاک مختلف مطالعه گردید. برای این کار خاک‌ها با سطوح متفاوت کود دامی تیمار و به مدت دو ماه در اینکوبیتور نگهداری گردیدند. سپس خاک‌ها با K2HPO4 به میزان mg P/kg45 تیمار و در اینکوبیتور در دمای 25 درجه سلسیوس به مدت 100 روز نگهداری شدند. در زمان-های صفر، 1، 5، 20، 50 و 100 روز از خاک‌ها نمونه‌گیری و Olsen-P آن‌ها اندازه‌گیری شد. نتایج نشان داد که سرعت اکسایش ماده آلی و میزان فسفر آلی معدنی شده با میزان رس همبستگی منفی معنی‌داری داشتند. همچنین سرعت اکسایش کربن آلی با میزان کود آلی اضافه شده به خاک‌ها افزایش یافت. به‌علاوه، فسفر موجود در کود دامی از قابلیت استفاده بالاتری نسبت به فسفر معدنی برخوردار بود. در حضور ماده آلی، سینتیک تثبیت فسفر تحت تأثیر از معدنی شدن فسفر آلی قرار گرفته شده و در هر زمان، برآیند اثرهای چهار فرآیند جذب در سطح، رسوب، غیرمتحرک شدن و معدنی شدن فسفر در دوره اینکوبیشن، سطح Olsen-P خاک را تعیین می‌نمایند. افزودن ماده آلی به خاک باعث افزایش بازیابی فسفر اضافه شده به خاک گردید، این اثر در زمان‌های طولانی‌تر پس از افزودن فسفر آشکارتر بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effects of Organic Matter on the Kinetics of P fixation in Different Type Soils

نویسندگان [English]

  • Mostafa Shirmardi 1
  • Hasan Towfighi 2
1 Ph.D. Candidate,Soil Science Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran
2 Associate Professor, Soil Science Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran
چکیده [English]

Effects of Organic Matter (OM) on the kinetics of P fixation were studied on four types of soil treated with different levels of cow manure and incubated for two months before being treated with K2HPO4 at the rate of 45 mg P/kg, and then incubated for a period of 100 days at 25○C. Samples were taken from the soils at within intervals of 0, 1, 5, 20, 50 and 100 days and then their Olsen-P determined. It was revealed that the rate of oxidation of OM and the amount of organic-P mineralized were negatively correlated with the clay fraction content of the soil. The rate of oxidation was also increased with increase in the amount of OM added to the soils. The P associated with the manure was of a higher availability than the P in the mineral fertilizer. Kinetics of P fixation in the presence of OM was influenced by the mineralization of P especially at shorter incubation times, and the net effects of adsorption, precipitation, immobilization and mineralization processes occurring during the incubation, determined the amount of Olsen-P at any time. Addition of OM to the soils caused an increase in the recovery of applied P, the effect being more pronounced  at longer incubation times.

کلیدواژه‌ها [English]

  • Mineralization
  • Organic carbon
  • kinetics
  • Organic phosphorus
  • P-Fixation

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