کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11024788 | 1701069 | 2019 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Assessing the ability of soil tests to estimate labile phosphorus in agricultural soils: Evidence from isotopic exchange
ترجمه فارسی عنوان
ارزیابی توانایی آزمایش های خاک برای تخمین فسفر قابل لمس در خاک های کشاورزی: شواهد مبنی بر مبادله ایزوتوپ
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
Efficient phosphorus (P) fertilization strategies are essential for intensive crop production with minimal negative environmental impacts. A key factor in sustainable P use is assessment of the plant available soil P pool using soil P tests. This study determined isotopically exchangeable P after six days of reaction with 33PO4 (P-E (6â¯d)) to determine how accurately two commonly used P tests, Olsen and AL (acid ammonium acetate lactate) can quantify the amount of labile P. Soil samples were taken from both highly P-amended and unamended plots at six sites within the Swedish long-term soil fertility experiments. According to P K-edge XANES spectroscopy, the P speciation was dominated by Al-bound P and organic P, with additional contributions from Fe-bound P and Ca phosphates in most soils. The results showed that the AL test overestimated P-E (6â¯d) by a factor of 1.70 on average. In contrast, the Olsen test underestimated P-E (6â¯d), with the mean ratios of P-Olsen to P-E (6â¯d) being 0.52 for high-P and 0.19 for low-P soils. The 33P/31P ratio in the Olsen extract of a 33PO4 spiked soil was closer to that of a 0.005â¯molâ¯Lâ1 CaCl2 soil extract than the corresponding ratio in the AL extract, suggesting that AL extraction solubilized more non-labile P. In conclusion, the AL and Olsen methods are not suitable for direct quantification of the isotopically exchangeable soil P pool after 6â¯days of equilibration. However, based on the results, Olsen may be superior to AL for classification of soil P status, due to its even performance for calcareous and non-calcareous soils and lower extraction of non-labile P.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volume 337, 1 March 2019, Pages 350-358
Journal: Geoderma - Volume 337, 1 March 2019, Pages 350-358
نویسندگان
Sabina Braun, Ruben Warrinnier, Gunnar Börjesson, Barbro Ulén, Erik Smolders, Jon Petter Gustafsson,