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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/83

Title: Evaluation of some chemical extractants for testing Zn availability to barley grown on calcareous soil
Authors: Falatah, A.M.
Modaihsh, A.S.
Al-Mustafa, W.A.
Mahjoub, M.O.
Keywords: Agricultural sciences
Chemical extractants
Barley grown
Issue Date: 1998
Publisher: King Saud University
Citation: Journal of King Saud University, Agricultural Sciences: 10(1); 85-97
Abstract: A greenhouse expe1;iment was carried out to evaluate the potential of utilizing NH4HCO3-DTP A, DTPA, EDTA and MgCI2 soil tests for assessing Zn availability to barley plants grown in 32 highly calcareous soils in Saudi Arabia. Zinc extracted by the four soil tests was in the order: EDTA> NH4HCOT DTPA> DTPA> MgCI2 and was significantly correlated with pH, CaCO3%' yield of dry matter, zinc concentration in plant tissue and plant Zn-uptake. The variability of extractable-Zn and the concentration of . Zn in plants were best estimated using the NH4HCO3-DTPA followed by the DTPA soil test. Only these two soil tests were able to adequately separate the 32 calcareous soils to responsive and non-responsive groups to Zn-fertilization based on yield response and Zn-tissue concentration combined criteria. Zn critical levels in soils as determined by NH4HCO3-DTPA soil test using the visual method, Cate and Nelson graphical method and Chi-square method were very similar and ranged between 0.82 and 0.85 ppm. The respective Zn critical levels using the DTPA soil test were 0.40-0.52 ppm indicating that the NH4HCOrDTPA soil test extracts higher amounts of Zn from soil. The obtained results, indicated that NH4HCO3-DTP A soil test was superior compared to other soil tests under investigation. Extractable Zn by NH4HCO3-DTPA and DTPA, from soil receiving ZnSO4, were 18.40102.1% for NH4HCOrDTPA and 16.9:1:2.9% for DTPA test. Both extractants provide a measure of the residual value of Zn fertilizer in calcareous soils situated in semiarid region.
Description: Department of Soil Science, College of Agriculture, King Saud University. P.O.Box 2460, Riyadh 11451. Saudi Arabia
URI: http://hdl.handle.net/123456789/83
Appears in Collections:Journal of the King Saud University - Agricultural Sciences

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