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This article in SSSAJ

  1. Vol. 26 No. 3, p. 265-270
    Received: Apr 17, 1961
    Accepted: Sept 20, 1961

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The Influence of Soil Moisture Regime and Phosphorus Source on the Response of Alfalfa to Phosphorus1

  1. J. D. Beaton and
  2. Neville A. Gough2



The influence of soil moisture regimes and P sources on the response of alfalfa to P was studied in the growth chamber. Surface samples of two calcareous British Columbia soils, Machete stony sandy loam and the Nisconlith clay loam were used. Alfalfa yield and P uptake were highest when soil moisture tension was allowed to reach a maximum of 2.0 bars and subsequently reduced to 0.2 bars. The P sources were almost equally available with this regime.

Calcium metaphosphate and anhydrous dicalcium phosphate produced the highest yields. P content of alfalfa was highest with monoammonium phosphate on the Machete soil. Monocalcium phosphate resulted in the highest tissue P with the Nisconlith soil. Amount of P removed from the soil, with the exception of hydroxyapatitc, was not markedly influenced by P source. Hydroxyapatitetreated soil released the lowest amount of NaHCO3-extractable P.

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