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This article in SSSAJ

  1. Vol. 28 No. 3, p. 403-405
    Received: Aug 14, 1963
    Accepted: Nov 7, 1963

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Availability of P from Superphosphate to Spring Wheat as Affected by Growth Stage and Surface Soil Moisture1

  1. G. O. Boatwright,
  2. Hayden Ferguson and
  3. Paul L. Brown2



The influence of periodic wetting of a dry surface soil on fertilizer P uptake at four growth stages was studied in the greenhouse using P32.

Wheat plants did not absorb fertilizer P from a dry soil. At all stages of growth there was a lag in fertilizer Pu ptake after watering and the length of lag increased with age of plant after the flag leaf stage. Only small amounts of fertilizer P were found in plants grown on soil that had been wet less than 80 hours. This suggests that showers and weather conditions which do not allow the fertilizer zone to remain wet for 3 to 4 days contribute little to fertilizer P uptake by wheat. Most rapid rate of fertilizer P uptake occurred when fertilizer and water were added at the flag leaf and 30% headed stages of plant growth, but when added at the completely head stage little fertilizer P was absorbed.

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