Enhanced uptake of phosphorus by mycorrhizal sorghum plants as influenced by forms of nitrogen

Ortas I. , Harris P., Rowell D.

PLANT AND SOIL, vol.184, no.2, pp.255-264, 1996 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 184 Issue: 2
  • Publication Date: 1996
  • Doi Number: 10.1007/bf00010454
  • Title of Journal : PLANT AND SOIL
  • Page Numbers: pp.255-264


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.