Table 1.

Soils used for the competitiveness test.

			Organic carbon	Total nitrogen
Site	Location	Type of soil	(%)	(%)	pH
Palo a Pique	33°15′S, 54°28′W	Typic Argiudoll	1.9	0.30	5.9
Glencoe	32°01′S, 57°09′W	Typic Hapludert	3.9	0.45	5.7
Cerro Colorado	33°51′S, 55°35′W	Typic Argiudoll	5.5	0.33	5.7
La Magnolia	31°41′S, 55°48′W	Typic Hapludarf	2.0	0.14	5.2
Cuchilla del Ombú	31°49′S, 55°36′W	Typic Argiudoll	5.6	0.26	5.7

The sites of soil collection were selected because they have white clover pastures and for each soil there were locations with and without history of clover inoculation.