Abstract
Abstract Ureolytic activity was evaluated in uncropped soilless potting media and in media that had been cropped for 4 to 12 weeks with subirrigation or drip fertigation systems in two sequential experiments. Space heating and root-zone heating treatments were compared in one of these experiments. Higher rates of urea hydrolysis tended to develop with drip fertigation than with subirrigation. Increased media temperatures during cropping were associated with increased urea hydrolysis rates. Ureolytic activity was not consistently affected by length of cropping. Interactions of media, fertigation system, and length of cropping indicate the complexity of the development of ureolytic activity in soilless potting media.
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