Table 3.
Chemical characteristics of Quartzipsamments (NQ), Eutroferric Red Oxisols (LVe) and Dystrophic Red Oxisols (LVd)
| Soil | pH | OM | P | S | K | Ca | Mg | Al | H + Al | CEC | V | m | Si | clay | silt | sand |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CaCl2 | g dm−3 | mg dm−3 | ––––– mmolc dm−3 ––––– | % | mg kg−1 | g kg−1 | ||||||||||
| NQ | 4.3 | 9 | 2 | 6 | 0.3 | 3 | 1 | 0 | 16 | 20.0 | 21 | 0 | 1 | 50 | 10 | 940 |
| Lve | 6.2 | 8 | 8 | 8 | 1.0 | 16 | 5 | 0 | 17 | 38.6 | 57 | 0 | 5 | 550 | 240 | 210 |
| LVd | 5.2 | 9 | 20 | 7 | 1.2 | 14 | 6 | 0 | 22 | 44.2 | 49 | 0 | 3 | 300 | 40 | 660 |
CEC Cation exchange capacity, V base saturation, m aluminum saturation, pH CaCl2 by potentiometry, H + Al SMP buffer by potentiometry, O.M. organic matter by spectrophotometry, P in resin by spectrophotometry, S by turbidimetry, K Ca and Mg atomic absorption spectrometry, Si 0.01 M calcium chloride