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This article in AJ

  1. Vol. 65 No. 3, p. 398-399
    Received: June 17, 1972



Temperature Variation Within and Between Rooting Media in Plant Growth Chambers1

  1. Daniel P. Knievel2



Controlled environment chambers are commonly used to study influence of microclimatic variables on plant processes. An often neglected variable in these studies is temperature of the root zone. Diurnal temperature patterns of soil at 2 and 5 cm and sand at 5 cm in a cool regime (16.8C day/12.8C night) and of soil at 2 and 5 cm and nutrient solution in a warm regime (37.8C day/31.2C night) were measured. Root zone temperatures in the cool regime were higher than air temperatures during the day and cooler at night. Temperatures of the root zone in the warm regime were lower than air temperature during both day and night periods. These data call attention to diferences in root zone and air temperature which can occur during temperature controlled environmental studies.

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