Table 2.
Kolmogorov-Smirnov test and t-test to identify soil and biological properties that best differentiate between Salinas Valley and Imperial/Yuma Valley locations.
| Column name* | Signed KS-score | KS-score | t-test p-value |
|---|---|---|---|
| Clay | −0.8571 | 0.8571 | 0.0012 |
| Na+ | −1 | 1 | 1.05E–07 |
| Fe | 0.7321 | 0.7321 | 0.0299 |
| ttd(d) | 0.8125 | 0.8125 | 8.18E–05 |
| K+ | −0.5446 | 0.5446 | 0.0848 |
| EC | −1 | 1 | 9.07E–06 |
| Nitrospira | 0.75 | 0.75 | 0.0014 |
| Cu | −0.3660 | 0.3660 | 0.0607 |
| tdd(d)_O1574554 | −0.6666 | 0.6666 | 0.4823 |
| Diversity index (H′) | 0.7321 | 0.7321 | 0.0026 |
| Molybdenum | −0.8125 | 0.8125 | 3.62E–04 |
| Proteobacteria | −0.8125 | 0.8125 | 1.63E–04 |
| WSOC | 0.6696 | 0.6696 | 0.0259 |
| T-N | 0.375 | 0.375 | 0.1693 |
| Ca++ | −0.875 | 0.875 | 5.08E–04 |
| Ni | 0.4375 | 0.4375 | 0.1660 |
| Alphaproteobacteria | 0.6875 | 0.6875 | 0.0047 |
| OC | −0.6517 | 0.6517 | 0.2614 |
| MBC | −0.3839 | 0.3839 | 0.3520 |
| SO4– | −0.9375 | 0.9375 | 4.55E–05 |
| pH | −0.5714 | 0.5714 | 0.0259 |
| Chloroflexi | 0.5446 | 0.5446 | 0.03441 |
| tdd(d)_O157NM | 0.6666 | 0.6666 | 0.0995 |
| Sand | 0.7321 | 0.7321 | 0.0027 |
| Bulk density | −0.5446 | 0.5446 | 0.0162 |
| Bacteroidetes | 0.7321 | 0.7321 | 0.0042 |
| WHC | −0.5267 | 0.5267 | 0.2032 |
| tdd(d)_O91 | 0.875 | 0.875 | 4.12E–06 |
| Acidobacteria | 1 | 1 | 0.0197 |
| Actinobacteria | 0.6071 | 0.6071 | 0.0240 |
| Mg++ | −0.7142 | 0.7142 | 0.0012 |
| tdd(d)_O26 | 1 | 1 | 0.0796 |
| Gemmatimonadetes | 0.75 | 0.75 | 0.0012 |
| Silt | −0.4821 | 0.4821 | 0.0403 |
| Firmicutes | 0.4821 | 0.4821 | 0.1989 |
| Verrucomicrobia | 0.4375 | 0.4375 | 0.3981 |
| Deltaproteobacteria | 0.9375 | 0.9375 | 8.55E–06 |
| Gammaproteobacteria | −0.8125 | 0.8125 | 6.92E–05 |
| Zn | −0.5892 | 0.5892 | 0.0056 |
| Planctomycetes | 0.8571 | 0.8571 | 0.0044 |
| PO4— | 1 | 1 | 0.0399 |
| tdd(d)_O103 | 0.875 | 0.875 | 2.84E–06 |
| Betaproteobacteria | 0.75 | 0.75 | 1.95E–05 |
| OTUs | −0.75 | 0.75 | 0.0015 |
| Location | 0.875 | 0.875 | 3.04E–06 |
| Management | −0.258 | 0.258 | 0.4128 |
Meaning of abbreviations under column names: Na, Sodium; Fe, iron; ttd(d), time till detection for E. coli O157:H7 strain 933; K, potassium; EC, electrical conductivity; Cu, copper; ttd (d) O157–4554, time till detection for E. coli O157:H7 strain 4555; AOC, assimilable organic carbon; TN, total nitrogen; Ca, calcium; N, Nickel; OC, organic carbon; MBC, microbial biomass carbon; SO4, sulfate; ttd (d) O157NM, time till detection for E. coli O157:H7 non-motile strain 4555; WHC, water holding capacity; ttd (d) O91,time till detection for E. coli O91; Mg, magnesium; ttd (d) O26, time till detection for E. coli O26; Zn, zinc; PO4, phosphate; OTUs, operation taxonomic units. Signed KS score: the minus sign indicates that the attribute indicated in the column name is on average smaller in value in Salinas Valley compared to Imperial/Yuma Valley locations.