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

Synopsis: 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.

² Research Range Conservationists, Crops Research Division, ARS, USDA.

³ Plant Physiologists, Department of Soils and Plant Nutrition, University of California, Berkeley. ~Present address of fourth author: International Minerals and Chemicals, Chicago, Illinois.

Received for publication February 25, 1965.

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