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تأثیر نوع عصارهگیر و نسبت خاک به عصارهگیر بر استخراج میزان پتاسیم قابل جذب خاک | ||
| تحقیقات آب و خاک ایران | ||
| دوره 53، شماره 7، مهر 1401، صفحه 1481-1497 اصل مقاله (1.63 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2022.341938.669253 | ||
| نویسندگان | ||
| کریم شهبازی* 1؛ میثم چراغی2؛ مصطفی مارزی3؛ کبرا سادات هاشمی نسب زواره3 | ||
| 1موسسه تحقیقات خاک و آب، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران، کرج، ایران | ||
| 2گروه علوم خاک، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| 3سازمان تحقیقات، ترویج و آموزش کشاورزی (AREEO)، موسسه تحقیقات خاک و آب (SWRI)، کرج، ایران | ||
| چکیده | ||
| پتاسیم بهعنوان عنصری ضروری که نقش آن در متابولیسم گیاهان و مقاومت آنها در برابر تنشهای زیستی و محیطی بارها ثابت شده است، برای مدیریت بهینه، نیاز به استخراج و اندازهگیری دقیق دارد. تحقیق حاضر با هدف بررسی اثر نسبت خاک به عصارهگیر بر اندازهگیری مقدار پتاسیم قابل جذب خاک انجام شد. بدین منظور در مهر ماه سال 1400، تعداد 62 نمونه خاک سطحی از مزارع کشاورزی سراسر کشور برداشته و مقدار پتاسیم آنها توسط سه عصارهگیر استات آمونیوم 1 مولار (سه نسبت 5:1، 10:1 و 20:1)، آمونیوم بیکربنات-DTPA (2:1، 5:1 و 10:1) و مهلیچ-3 (5:1، 10:1 و 20:1)، در موسسه تحقیقات خاک و آب کرج اندازهگیری شد. نتایج نشان داد که مقدار پتاسیم قابل جذب اندازهگیری شده، توسط عصارهگیرهای استات آمونیوم و مهلیچ-3 فاقد اختلاف معنیدار بود، اما این دو عصارهگیر با آمونیوم بیکربنات-DTPA اختلاف معنیدار داشتند. احتمالاً دلیل این اختلاف، جایگزین شدن نسبت 2:1 با نسبت 20:1 در روش عصارهگیری با آمونیوم بیکربنات-DTPA است. با افزایش نسبت خاک به عصارهگیر، میزان برآورد پتاسیم قابل جذب خاک توسط هر سه عصارهگیر بهطور معنیداری افزایش یافت. بهطور میانگین، مقدار پتاسیم عصارهگیری شده در نسبت 20:1 بهترتیب %5/11 و %01/5 بیشتر از نسبت 5:1 و 10:1 استات آمونیوم و %79/8 و %84/6 بیشتر از نسبت 10:1 و 5:1 مهلیچ-3 بود. با استفاده از نسبت 10:1، هر سه عصارهگیر مقدار پتاسیم قابل جذب خاک را بدون اختلاف معنیدار اندازهگیری کردند. بنابراین، پیشنهاد میشود که در مواقع لزوم میتوان از هر سه عصارهگیر برای تعیین مقدار پتاسیم قابل جذب استفاده کرد. همچنین بهنظر میرسد که نسبت 10:1، نسبت مناسبی برای اندازهگیری مقدار پتاسیم قابل جذب با حداقل تفاوت بین عصارهگیرهای مختلف باشد. | ||
| کلیدواژه‌ها | ||
| آمونیوم بیکربنات-DTPA؛ استات آمونیوم؛ پتاسیم؛ مهلیچ-3 | ||
| عنوان مقاله [English] | ||
| The effect of extractant type and soil/extractant ratio on the extraction of soil available potassium | ||
| نویسندگان [English] | ||
| Karim Shahbazi1؛ Meysam Cheraghi2؛ Mostafa Marzi3؛ kobra sadat hasheminasab zavareh3 | ||
| 1Soil and Water Research Institute, Agricultural Research, Education, and Extension Organization, Karaj, Iran | ||
| 2Department of Soil Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran | ||
| 3Agricultural Research, Education and Extension Organization (AREEO), Soil and Water Research Institute (SWRI), Karaj, Iran | ||
| چکیده [English] | ||
| Potassium, as an essential element, which its role in plant metabolism and resistance to biological and environmental stresses has been proven many times, requires accurate extraction and measurement for optimal management. The present study was conducted to investigate the effect of soil/extractant ratio on measuring the amount of available potassium in the soil. For this purpose, in October 2021, 62 soil samples were taken from agricultural fields all over the country, and their potassium content was measured by three extractants: 1 M ammonium acetate (three ratios of 5:1, 10:1, and 20:1), ammonium bicarbonate-DTPA (2:1, 5:1, and 10:1), and Mahlic-3 (5:1, 10:1, and 20:1) in the Karaj soil and water research institute (SWRI). The results showed that the amount of available potassium measured by ammonium acetate and Mehlich-3 extractants had no significant difference, but these two extractants had a significant difference with ammonium bicarbonate-DTPA. Probably, this difference is due to replacing the 2:1 ratio with a 20:1 ratio in the extraction method by ammonium bicarbonate-DTPA. In all three extractants, the estimated soil available potassium increased by increasing the soil to extractant ratio. On average, the amount of extracted potassium in 20:1 ratio was 11.5% and 5.01% more than the ratio of 5:1 and 10:1 for ammonium acetate, and 8.79% and 6.84% more than the ratios of 10:1 and 5:1 for Mehlich-3, respectively. By using a 10:1 ratio, all three extractants measured the amount of soil-available potassium without any significant differences. Therefore, it is suggested that all three extractants be used to determine the amount of available potassium. In addition, it seems a 10:1 ratio is a suitable ratio for measuring the amount of available potassium with minimal difference between different extractants. | ||
| کلیدواژه‌ها [English] | ||
| Ammonium acetate, Ammonium bicarbonate-DTPA, Mehlich-3, Potassium | ||
| مراجع | ||
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