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Synopsis: Soil temperatures near 59° F. were optimum for the growth of barley. By increasing the available P level, through either increased native soil or fertilizer P supply, the soil temperature range over which nearly maximum barley growth occurred was greatly increased. Growth responses to P fertilization were much more dependent upon soil temperature for soils low in P availability than for those medium in available P supply.
2 Soil Scientists, USDA, Mandan, North Dakota.
Received for publication December 7, 1962.
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