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This article in AJ

  1. Vol. 57 No. 5, p. 505-508
    Received: Feb 25, 1965

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Phosphorus Nutrition of Italian Ryegrass Relative to Growth, Moisture Content, and Mineral Constituents1

  1. L. O. Hylton2,
  2. A. Ulrich3,
  3. D. R. Cornelius2 and
  4. K. Okhi3



Plant growth and the absorption of P by Italian ryegrass from nutrient solution was affected by P supply, whereas the distribution and accumulation of P within the ryegrass was largely determined by the kind of, and age of, tissue sampled. Blade 1, the youngest blade that was fully open and had a ligule, and H2PO4-P were selected, from 6 plant parts sampled and 2 forms of P determined, as the best combination to diagnose the P status of Italian ryegrass. About 750 ppm of H2PO4-P in blade 1 tissue was tentatively set as the critical concentration for growth of the ryegrass.

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