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Characterization of Phosphorus Efficiencies of Two Winter Wheat Cultivars

College of Agriculture, Texas A&I Univ., Kingsville, TX 78363

N. W. Christensen

Dep. of Soil Science, Oregon State Univ., Corvallis, OR 97331

*Corresponding author.

ABSTRACT

‘Stephens’ and ‘Yamhill’ winter wheat (Triticum aestivum L.) cultivars respond differently to P fertilization on low-P soils. The objective of this study was to determine the reason for greater P efficiency in Yamhill. The cultivars were grown in three growth-chamber experiments to describe response to a factorial combination of P levels and soil fumigation, and to compare root growth rates, root hair formation, and tissue P concentrations. Cultivars did not differ in root growth rate, total P uptake, or response to fumigation. Root hair length was affected by an interaction between cultivars and P concentrations in the growth medium. At the 2 µM P level, Yamhill had significantly (P = 0.05) longer root hairs than Stephens. Yamhill produced significantly greater shoot dry weight per unit of P taken up (0.20 g mg^–1) than Stephens (0.17 g mg^–1). The greater P efficiency of Yamhill was attributed to greater P-use efficiency rather than to differences in P uptake.

Oregon Agric. Exp. Stn. Technical Paper no. 8979.

Received for publication August 16, 1989.