caa a22 4500 477109527 CHVBK 20180405111604.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00010454 doi (NATIONALLICENCE)springer-10.1007/BF00010454 Enhanced uptake of phosphorus by mycorrhizal sorghum plants as influenced by forms of nitrogen [Elektronische Daten] [I. Ortas, P. Harris, D. Rowell] The effects of NH4 +-N and NO3 --N applications on rhizosphere pH and P uptake were investigated with and without mycorrhizal inoculation. Sorghum (Sorghum bicolor L.) plants were grown in split pots and in different soils with different initial soil pH values and P contents. In both soils, ammonium treatment resulted in higher plant dry weight and P content than nitrate treatment at all P levels. Mycorrhizal inoculation enhanced the differences. Sorghum plants acidified the rhizosphere at low soil P status with both nitrogen forms, and with or without mycorrhiza. When N was supplied as NO3 --N, rhizosphere pH increased gradually with increasing P addition. The experiments showed that, although the zone of strong acidification coincided with the main zone of P depletion, the contribution of Arbuscular Mycorrhizal Fungi (AMF) to P uptake extended beyond the effect of rhizosphere pH change. There were no differences in pH change between mycorrhizal and non-mycorrhizal inoculated soils with the same N form, and it appears that pH change is an independent factor affecting P uptake regardless of whether the plant root is infected or not. The differences in soil pH change with N form do not however explain sufficiently the differences in dry matter increase and P uptake between mycorrhizal and non-mycorrhizal plants. Kluwer Academic Publishers, 1996 mycorrhizae nationallicence N forms nationallicence phosphorus uptake nationallicence rhizosphere pH nationallicence Ortas I. Department of Soil Science, The University of Reading, P.O. Box 233, RG6 6DW, Whiteknights, UK aut Harris P. Department of Soil Science, The University of Reading, P.O. Box 233, RG6 6DW, Whiteknights, UK aut Rowell D. Department of Soil Science, The University of Reading, P.O. Box 233, RG6 6DW, Whiteknights, UK aut Plant and Soil Kluwer Academic Publishers; gopher://gopher:wkap.nl 184/2(1996-06-01), 255-264 0032-079X 184:2<255 1996 184 11104 https://doi.org/10.1007/BF00010454 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00010454 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ortas I. Department of Soil Science, The University of Reading, P.O. Box 233, RG6 6DW, Whiteknights, UK aut NATIONALLICENCE 700 1- Harris P. Department of Soil Science, The University of Reading, P.O. Box 233, RG6 6DW, Whiteknights, UK aut NATIONALLICENCE 700 1- Rowell D. Department of Soil Science, The University of Reading, P.O. Box 233, RG6 6DW, Whiteknights, UK aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher:wkap.nl/ 184/2(1996-06-01), 255-264 0032-079X 184:2<255 1996 184 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer