Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4555140 | Environmental and Experimental Botany | 2010 | 6 Pages |
Abstract
Low responsiveness of cotton to P fertilizer application on soils with low soil-test P values indicates that cotton might take up P from stable P pools. The ability of cotton to acquire P from sparingly soluble P sources was examined by comparing with wheat and white lupin. The plants were grown in washed river sand, with P sources applied at a rate of 40 mg P kgâ1, as sparingly soluble AlPO4, FePO4, or hydroxyapatite. Cotton was inefficient in accessing P from any of the sparingly soluble P sources. Thus, the low responsiveness of cotton to P fertilizers could be attributed to factors other than efficient P acquisition from the stable P pool in the soil. In contrast to white lupin which accessed little P from the sparingly soluble P sources in this study, wheat showed an outstanding ability in utilizing AlPO4. When compared with the control, total uptake of P from AlPO4 by wheat was approximately 9 times higher than cotton and 7 times higher than white lupin, which was possibly related to its high root Al concentration and high root:shoot ratio. The study concludes that the three species differed substantially in P acquisition from the sparingly soluble AlPO4, with cotton being least efficient and wheat most efficient.
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Authors
Xiaojuan Wang, Caixian Tang, Chris N. Guppy, Peter W.G. Sale,