Available Mo and P in organic soils and Mo recovery from tannic acid solutions.

<p>A) Fraction of available (resin-extractable) Mo and P in O horizon soils averaged across six forest sites. B) Recovery of Mo and P (resin-extractable) after addition and 20–25 hours of incubation of molybdate and phosphate to freshly sampled O horizon soils of six forest sites. C) Recovery of Mo (resin-extractable) from 0.1 mM solutions of Mo and increasing concentrations of tannic acid (<i>n</i> = 6) relative to tannic-acid free controls. Values represent means ± s.e.m.</p

Nitrogenase activity (Acetylene reduction activity in nmol C₂H₂ g⁻¹ h⁻¹) in response to additions of P to soils from six forest sites (mean (s.e.m.); <i>n</i> = 5.

<p>Nitrogenase activity (Acetylene reduction activity in nmol C₂H₂ g⁻¹ h⁻¹) in response to additions of P to soils from six forest sites (mean (s.e.m.); <i>n</i> = 5.</p