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Phosphorus Absorption During Various Growth Stages of Spring Wheat and Intermediate Wheatgrass¹

Solution cultures were used to study the importance of P absorption during various growth stages of spring wheat and intermediate wheatgrass. Phosphorus was not needed in the solution cultures during all growth phases of the two crops. A supply of P for the first 5 weeks (up to heading for wheat) was adequate to produce maximum dry matter for both species and for maximum grain production of wheat. Maximum root development was achieved when P was supplied for the first 4 weeks of growth.

Although plants absorbed only small quantities of P prior to tillering, this amount was important. When P was withheld for the first 2 weeks, tiller and secondary root development was hindered. Yields of wheat and wheatgrass tops and wheat grain were only 80, 59, and 42% of maximum, respectively.

Although P uptake occurred after wheat headed, this P was not utilized for dry matter or grain production. Maximum accumulation of P occurred when P was initially withheld, but supplied later until harvest.

² Soil Scientist, USDA, Bozeman, Montana, and Chief Scientist, USDA, Fort Collins, Colorado.

Received for publication July 21, 1965.