Table 3 Critical values and coefficient of determinations for each test method for obtaining 90% of maximum dry matter at two root densities; “—” denotes no significant relationship was observed.
Soil test | CaCl2 K | Colwell K | NH4OAc K | DGT K | |
|---|---|---|---|---|---|
mg kg−1 | |||||
High demand and root density | Critical value | 83 | 151 | 142 | 10 |
R2 | 0.73 | 0.53 | 0.51 | 0.59 | |
Low demand and root density | Critical value | 57 | 114 | 91 | — |
R2 | 0.40 | 0.31 | 0.56 | — | |
