Water extractable soil sodium explained 53% of the variability in %BDOC.
Carbon in particulate OM (CPOM) was determined in non-Allophanic soils, and C extractable with sodium pyrophosphate (Cp) in Allophanic soils.
Specifically, SOC content was significantly correlated with sodium pyrophosphate extractable metals emphasizing the relevance of organo-metal complexes in volcanic soils.
Random Forest was successful in incorporating many weakly and non-linearly correlated covariates with SOC (RMSE = 14.7 g kg− 1), provided Alp (the sodium pyrophosphate extractable aluminum), the best predictor of SOC (r = 0.85) but also the most costly variable to acquire.
Sodium hydroxide extractable Pi (NaOH-Pi) in sheep dung was almost threefold of that in leaf compost (Table 4).
Extractable calcium, magnesium, potassium, sodium, and sulfur were determined following Suarez (1996).
Only 25% of this was extractable by water and sodium acetate/EDTA solution, and about 85% (wall-bound pectin) was released by 0.1M HCl at 100°C for 1 h (Additional file 1: Table S3. More pectin was released from MYB4-OX lines than from controls (Additional file 1: Table S3).
The largest depletion of sodium bicarbonate-extractable organic P (NaHCO3 Po) (74% and 77%) and sodium hydroxide-extractable Po (NaOH Po) (67%and6767%) due to cultivation occurred in the sand, followed by the silt (52% and 56%, NaHCO3 Po and 32%and5353%, NaOH Po) and the clay (33% and 42%, NaHCO3 Po and 28%and35%5%, NaOH Po) size separates from the two sites, respectively.
Extractable potassium (Kext), calcium (Caext) and sodium (Naext) were determined using a flame photometer (Elico™ CL378) after extraction with neutral 1 N ammonium acetate solution.
2 10 13–16 S-ANA is generated by antibodies targeting 'extractable nuclear antigens' (ENA), that is, a group of extrachromosomal antigens that are readily extracted with 0.15 M sodium chloride, for instance 'small nuclear ribonucleoprotein' (snRNP) and the 'Smith antigen' (Sm), which are both located on U1-RNP particles.
