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This article in AJ

  1. Vol. 58 No. 2, p. 185-188
    Received: July 21, 1965

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

  1. G. O. Boatwright and
  2. F. G. Viets Jr.2



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.

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