Appendix 1.
Levels of soil nitrate (NO3), ammonium (NH4), phosphate (P), pH, and electrical conductivity (EC) in soil samples from each study site. Data are presented as site means with standard deviation in parentheses.*
| Site (No. samples) | NO3 (µg g soil−1) | NH4 (µg g soil−1) | P (µg g soil−1) | pH | EC (µS cm−1) |
| El Eden (n = 14) | 3 (3)a | 12 (8)a | 13 (5)a | 7.62 (0.6)a | 146 (41)a |
| La Higuera (n = 19) | 3 (2)a | 32 (11)b | 21 (11)b | 8.34 (0.3)b | 173 (60)a |
*
Within each column, means with the same letter do not differ significant at P < 0.05 (Tukey’s HSD test).