Uptake of residual phosphate and freshly applied diammonium phosphate by Lolium perenne and Trifolium repens

  • Gallet A
  • Flisch R
  • Ryser J
 et al. 
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Residual fertilizer phosphorus (residual P) may significantly contribute to crop P nutrition. To test this hypothesis, a pot experiment was conducted with ryegrass (Lolium perenne) and clover (Trifolium repens) grown separately on three different soils which either had not received P fertilizer for at least nine years (0F) or had received P fertilizer equivalent to crop P off-take (F). Soils in the pot experiment were given either none (0F, F) or a single rate of 15 mg P (kg soil)–1 as diammonium phosphate (0F+DAP, F+DAP). In the treatments 0F+DAP and F+DAP DAP had been labeled with 33PO4 while in the treatments 0F and F the pool of available soil P had been labeled with carrier-free 33PO4. This allowed estimating the quantities of P in plant dry matter that derived from native soil P, residual fertilizer P or fresh fertilizer P. Fourteen to 62 % of the P in the above ground biomass of white clover or perennial ryegrass were derived from residual P whereas 7 to 28 % were derived from freshly applied DAP. The proportion of P derived from residual P was correlated to the total amount of P fertilizer added to the soils, while the proportion of P derived from DAP was correlated to the concentration of P in the soil solution of the 0F and F soils.

Author-supplied keywords

  • Association Lolium
  • Fresh fertilization
  • Lolium perenne
  • Phosphorus
  • Residual fertilization 7 isotopic methods
  • Trifolium
  • Trifolium repens

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  • Anne Gallet

  • René Flisch

  • Jean Pierre Ryser

  • Joseph Nösberger

  • Emmanuel Frossard

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