Table III.

Malate/phosphate exudation rates (nmol h⁻¹ root⁻¹) for intact (with or without root cap) and excised root tips of cv Cateto-Colombia in the presence and absence of Al

Al3+ Activity	Whole Plant		Excised Root Tips
	Capped	Decapped	Primary	Secondary
μm
0	0.30 ± 0.08	0.13 ± 0.08	0.30 ± 0.02	0.27 ± 0.05
20	0.31 ± 0.07	0.15 ± 0.07	0.32 ± 0.03	0.33 ± 0.03