Volume 10, Number 4 (winter 2007)                   JWSS 2007, 10(4): 107-119 | Back to browse issues page


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A. R. Hoseinpur, H. Shariatmadari. Phosphorus Soil Testing:1- Evaluating of a Few Extractants in Determining Alfalfa Available Phosphorus. JWSS. 2007; 10 (4) :107-119
URL: http://jstnar.iut.ac.ir/article-1-609-en.html

Abstract:   (14969 Views)
Hamadan province is one of the most important alfalfa (Medicago sativa) producing regions in Iran. However, little is known about P status in this region and no suitable extraction method has yet been introduced. This experiment was carried out to determine the available phosphorus by nine chemical extractants in some soils of the Hamadan region. The treatments consisted of 15 soils and 2 P levels (0 and 200 mg P kg-1 as Ca(H2PO4)2.H2O ) in a factorial experiment in a randomized design with three replications. Alfalfa plant were harvested in three cutting. The results indicated that the amount of extractable phosphorus decreased in the following order: Collwell>Bray 2>0.1 N HCl>Bray 1>Olsen>AB-DTPA>Mehlich 1>Mehlich 2 > 0.01 M CaCl2 The amounts of P extracted by all methods except that by 0.01 M CaCl2 method, showed significant correlation. The results of correlation studies showed that in the first cutting, Collwel method, in the second cutting AB-DTPA, Olsen, Collwel, Bray 1, Bray 2 and Mehlich 2 and in the third cutting, AB-DTPA, Olsen, Collwel, Bray 1, and Mehlich 2 methods seems to be suitable extractants for assessing available P of soils in Hamadan province.
Full-Text [PDF 235 kb]   (1889 Downloads)    
Type of Study: Research | Subject: Ggeneral
Received: 2008/01/9

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