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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/10049

Title: Evaluation of NH4HCO3-DTPA, DTPA and Hydroquinon Soil Test for Assessment of iron Availability to Wheat in Calcareous Soils
Authors: W. A. AI-Mustafa
Issue Date: 1993
Abstract: A greenhouse pot experiment with 46 calcareous soils of ASaudi Arabia was carried out to evaluate the potential of utilising NH4HCO3-DTPA, DTPA and hydroquinon soil tests for assessing Fe availability to wheat plants. The hydroquinon extractant removed the most Fe from the soils. followed by NH4HC03.DTPA and DTPA extractants in decreasing order. Also, the variability of extractable-Fe was best described and the plant-Fe was best estimated using the NH4HC03.DTPA followed by the DTPA soil test. Only these two methods were able to adequately separate the 46 calcareous soils to responsive and non-responsive groups to Fe fertilization based on yield response and Fe-concentration. Fe critical levels in soils as extracted by NH4HC03.DTPA soil test using the visual method, Cate and Nelson graphical method and Chi-square method were in the range between 4.1 to 4.3 ppm. The respective Fe critical levels for DTPA soil test were 3.9 to 4.2 ppm. Extractability of fertilizer Fe by NH4HC03.DTPA and DTPA from soil, receiving Fe-EDDHA averaged 19.3 ± 2.4% for NH4HC03.DTPA and 17.8 ± 2.8 % for DTPA test, indicating that NH4HC03.DTPA soil test provides as well as DTPA test a measure of the residual value of Fe fertilizer in calcareous soils
URI: http://hdl.handle.net/123456789/10049
Appears in Collections:College of Foods And Agricultural Science

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