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.
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Power et al. (1963) studied this question.
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