بهینه‌سازی شرایط تغذیه‌ای و محیطی برای آزادسازی پتاسیم از ایلایت توسط Aspergillus niger و Pseudomonas fluorescens

نویسندگان

1 دانشجوی دکتری گروه علــوم خاک، دانشکده کشاورزی، دانشگاه ارومیه

2 استاد گروه علــوم خاک، دانشکده کشاورزی، دانشگاه ارومیه

3 استادیار گروه علــوم خاک، دانشکده کشاورزی، دانشگاه ارومیه

چکیده

پژوهش حاضر با هدف ارزیابی اثر منابع مختلف کربن بر قابلیت انحلال پتاسیم توسط باکتری Pseudomonas fluorescens و قارچ Aspergillus niger و مدل‌سازی اثر سطوح مختلف متغیرهای زمان انکوباسیون، pH و منبع کربن بر انحلال‌پذیری پتاسیم با استفاده از طرح مرکب مرکزی انجام شد. در مرحله‌ی اول، بر مبنای طرح پلاکت – برمن، تعداد 12 آزمایش با ترکیب سطوح مختلف تعریف شده و تأثیر منابع مختلف کربن شامل گلوکز، ساکارز و فروکتوز در دو سطح 1+ (10 گرم در لیتر) و 1- (5 گرم در لیتر) بر انحلال پتاسیم موجود در ایلایت مورد بررسی قرار گرفت. در مرحله‌ دوم، پس از گزینش منبع کربن مهم و تأثیرگذار، دامنه‌های متفاوتی از متغیرهای مستقل شامل زمان انکوباسیون، pH و منبع کربن در نظر گرفته شده و بر اساس مقادیر کدبندی شده متغیرهای مستقل، طراحی آزمایش صورت پذیرفت. نتایج نشان داد تأثیر منابع کربن بر رهاسازی K توسط باکتری و قارچ معنی‌دار نبود و لذا ﻫﺮ ﮐﺪام از آنﻫﺎ ﻣﯽﺗﻮاﻧﻨﺪ ﺑﻪﻋﻨﻮان ﺟﺎﯾﮕﺰﯾﻦ ﯾﮑﺪﯾﮕﺮ در ﻣﺤﯿﻂ‌ﮐﺸﺖ اﺳﺘﻔﺎده ﺷﻮﻧﺪ. بر مبنای نتایج تحلیل آماری ضرایب مدل طرح مرکب مرکزی، pH اثر مثبت و افزاینده‌ای‌ بر افزایش رهاسازی پتاسیم محلول داشت (0001/0>P). به‌طوری‌که بیشترین آزادسازی پتاسیم توسط باکتری و قارچ به‌ترتیب برابر با 75/109 و 3/170 میلی‌گرم در لیتر، در سطوح مرکزی زمان و منبع کربن، و 36/10 = pH مشاهده شد. بر اساس مقدار ضریب تبیین مدل طرح مرکب مرکزی، به‌ترتیب 91 و 8/87 درصد از تغییرات پتاسیم محلول در حضور باکتری و قارچ توسط این مدل قابل تبیین بود.

کلیدواژه‌ها

عنوان مقاله [English]

Optimizing Nutritional and Culture Medium Conditions for Potassium Release from Illite by Aspergillus niger and Pseudomonas fluorescens

نویسندگان [English]

  • Sanaz Ashrafi-Saeidlou 1
  • Abbas Samadi 2
  • MirHassan Rasouli-Sadaghiani 2
  • Ebrahim Sepher 2
  • M barin 3
1 Ph.D. Student, Soil Science Department, Faculty of Agriculture, Urmia University, Urmia, Iran
2 Prof. Soil Science Department, Faculty of Agriculture, Urmia University, Urmia, Iran
3 Assist. Prof. Soil Science Department, Faculty of Agriculture, Urmia University, Urmia, Iran
چکیده [English]

Abstract
Present research was carried out to evaluate the effect of different carbon sources on K release by Pseudomonas fluorescens and Aspergillus niger and modeling the effects of incubation time, pH and different amounts of carbon source on K release using central composite design. At the first step, 12 experiments were defined with a combination of different levels, and the effects of different carbon sources including glucose, sucrose and fructose at two levels of +1 (10 g.l-1) and -1 (5 g.l-1) on potassium dissolution of illite was studied. After selection of effective carbon source, different ranges of independent variables including incubation time, pH and carbon source were considered and experiment design has been made based on the coded values of them. Results showed that there is no difference between carbon sources, which were used at the first step of experiment, so each of them can be used as alternatives to each other in culture medium. According to the statistical analysis results of central composite design, pH has a positive impact on increasing the soluble potassium release (P>0.001). Maximum potassium release by bacteria and fungus, 109.75 and 170.3 mg.l-1 respectively, observed at central levels of incubation time and carbon source and pH = 10.36. Based on determination coefficient of, 91 and 87.8 percent of soluble potassium changes in the presence of bacteria and fungus can be explained by this central composite design model, respectively.

کلیدواژه‌ها [English]

  • "Illite"
  • "Optimization"
  • "Potassium"
  • "Solubilizing Microorganisms"
  • "Carbon Source"

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دانش آب و خاک
دوره 32، شماره 1
فروردین 1401
صفحه 53-70

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