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

ABSTRACT

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.

¹ Contribution from the Department of Soil Science, University of British Columbia, Vancouver 8, B. C. This paper includes portions of a thesis submitted by the second author in partial fulfillment of requirements for the M.S.A. degree at the University of British Columbia. The authors wish to acknowledge the financial assistance received from Canada Department of Agriculture Extra-Mural Research Grant 107 to support this work. Dr. K. F. Nielsen kindly acted as liaison officer.

² Formerly Instructor, Department of Soil Science, University of British Columbia, now Soil Scientist, Research and Development Division, Consolidated Mining and Smelting Co. of Canada Ltd., Trail, B. C., and Research Assistant, Department of Soil Science, University of British Columbia, respectively.

Received for publication April 17, 1961. Accepted for publication September 20, 1961.