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Soil Temperature and Phosphorus Effects Upon Nutrient Absorption by Barley¹

Synopsis: N and P absorption by barley was maximum at soil temperatures near optimum for dry matter production. Optimum temperatures were 52 to 59° F. for a soil low in P, and slightly higher for a soil higher in NaHCO₃-soluble P. Fertilizer P absorption was more dependent upon soil temperature than was the absorption of soil P. The relation between dry weights and percent P in plant tops varied with temperature. The "critical level" for P was lowest, and the efficiency of P utilization was highest at the 59° F. temperature.

Soil Scientists, Northern Great Plains Field Station, Mandan, North Dakota.

Received for publication December 6, 1963.