Table 1.

Chemical analysis of rhizosphere soil from B. scandens and S. chilense growing naturally in Atacama Desert.

Samples	B. scandens	S. chilense
POlsen (mg kg−1)	5	9
K (mg kg−1)	328	411
Organic matter (%)	0.91	1.21
pH H2O	7.2	6.32
K (cmol (+)kg−1)	0.84	1.05
Na (cmol (+) kg−1)	1.26	0.55
Ca (cmol (+) kg−1)	9.03	7.87
Mg (cmol (+) kg−1)	1.36	2.04
CEC * (cmol (+) kg−1)	12.51	11.54

* CEC = catión Exchange capacity = Σ(K, Ca, Mg y Mg).