Urease activity as affected by main effects of P application and subplot effects of cropping system in 2011 and 2012.

<p>Values are means of three replicates. Values followed by the same lowercase letters are not significantly different among different cropping systems with the same P rate in one year at the 5% level by LSD (horizonal comparison); values followed by the same capital letters are not significantly different among different P rates (vertical comparison) or among different cropping systems (horizonal comparison) in one year at the 5% level by LSD. Values under ANOVA are the probabilities (<i>P</i> values) of the sources of variation.</p><p>Urease activity as affected by main effects of P application and subplot effects of cropping system in 2011 and 2012.