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تاثیر جدایههای اکتینومایست بر فراهمی پتاسیم و برخی ویژگیهای خاک و رشد گیاه جو | ||
| تحقیقات آب و خاک ایران | ||
| دوره 57، شماره 1، فروردین 1405، صفحه 189-208 اصل مقاله (1.89 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2026.407444.670064 | ||
| نویسندگان | ||
| رضا طالبی1؛ نسرین قربان زاده* 1؛ محمد باقر فرهنگی1؛ سینا نوری زاده2 | ||
| 1گروه علوم و مهندسی خاک، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران | ||
| 2سازمان کشاورزی استان گیلان، مدیریت و حفاظت گیاهان، رشت، ایران | ||
| چکیده | ||
| این پژوهش با هدف بررسی توانایی جدایههای اکتینومایست در افزایش فراهمی پتاسیم و بهبود ویژگیهای خاک و رشد گیاه جو در دو بخش انجام شد. در بخش اول، آزمایشی در قالب طرح کاملاً تصادفی با ۲۹ جدایه اکتینومایست در محیط الکساندروف در سه تکرار انجام و توانایی جدایهها در انحلال پتاسیم و تغییر pH محیط کشت ارزیابی شد. در بخش دوم، تاثیر دو جدایه برتر بر برخی صفات رشدی گیاه جو و برخی ویژگیهای خاک بررسی شد. آزمایش به صورت طرح بلوکهای کامل تصادفی با چهار تیمار (شاهد (C)، کود شیمیایی (CF) و دو جدایهS3C وS5A) و در سه تکرار انجام شد. نتایج نشان داد که در محیط الکساندروف کمترین مقدار pH (23/3 و 25/4) و بیشترین مقدار پتاسیم محلول (83/4 و 73/4 میلیگرم بر لیتر) به ترتیب مربوط به جدایههای S3C و S5A بود. کمترین مقدار pH و بیشترین مقدار پتاسیم خاک در دو تیمار دارای جدایههای اکتینومایست اندازهگیری شد. مقدار فسفر فراهم خاک در تیمار S3C و مقدار نیتروژن معدنی و آهن فراهم در تیمار S5A بیشترین مقدار بود. مقدار پتاسیم گیاه در تیمارهای S3C وS5A نسبت به تیمار شاهد به مقدار 3 برابر افزایش نشان داد. بیشترین مقدار فسفر و آهن گیاه به ترتیب در تیمارهای S3C و S5A ثبت شد. از آنجا که این ریزجانداران علاوه بر آزادسازی پتاسیم در خاک، موجب بهبود عناصر غذایی قابل دسترس میشوند، استفاده از آنها پس از انجام آزمایشهای میدانی، میتواند بهرهوری محصول را افزایش دهد. | ||
| کلیدواژهها | ||
| ریزجانداران حل کننده پتاسیم؛ ریزوسفر؛ کود زیستی؛ مدیریت پایدار | ||
| عنوان مقاله [English] | ||
| Effect of Actinomycete Isolates on Potassium Availability, Soil Characteristics, and Barley Growth | ||
| نویسندگان [English] | ||
| Reza Talebi1؛ Nasrin Ghorbanzadeh1؛ Mohammad Bagher Farhangi1؛ Sina Noorizadeh2 | ||
| 1Department of Soil Science, Faculty of Agriculture, University of Guilan, Rasht, 41635-1314, Iran. | ||
| 2Agriculture Organization of Guilan Province, Management of Plant Protection, Rasht, Iran | ||
| چکیده [English] | ||
| This study comprises two complementary experiments to evaluate whether actinomycete isolates can (i) enhance potassium solubility and improve soil properties, and (ii) promote barley growth. Part I employed a completely randomized design with 29 actinomycete isolates cultured in Alexandrov medium (three replications per isolate) to evaluate their ability to dissolve potassium and to alter culture medium pH. Part II examined the effects of the two superior isolates on barley growth traits and soil properties using a completely randomized block design with four treatments: control (C), chemical fertilizer (CF), and the two selected isolates, S3C and S5A, each with three replications. A suite of soil properties, plant growth metrics, and plant nutritional status was measured. In Alexandrov medium, isolates S3C and S5A produced the lowest pH values (3.23 and 4.25, respectively) and the highest soluble potassium concentrations (4.83 and 4.73 mg L-1, respectively). In soil, both actinomycete containing treatments yielded the lowest pH and the highest available potassium. Additionally, the highest available soil phosphorus was observed in the S3C treatment, and the highest available nitrogen and iron in the S5A treatment. Plant analyses showed that the potassium content in barley increased approximately 3 times in the S3C and S5A treatments relative to the control. The highest plant phosphorus and iron contents were observed in the S3C and S5A treatments, respectively. Overall, these microorganisms not only release potassium into the soil but also enhance the broader soil nutrient status. These results support the potential of actinomycete isolates as biofertilizers to boost crop productivity and promote sustainable agricultural practices. Further field validation is warranted to translate these findings into agronomic recommendations. | ||
| کلیدواژهها [English] | ||
| Biofertilizer, Potassium solubilizing microorganisms, Rhizosphere, Sustainable management | ||
| مراجع | ||
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