An often-used analysis of feedstocks for lifestocks is the Weender analysis, which basically divides the volatile solid content into fats, fibre and protein, as well as N-free matter. I found no English language article on the process.
The individual values and how they are arrived at are:
- Fat: anything dissolvable in organic solvents;
- Fibre: anything not dissolvable in acids or bases;
- Protein: N-content times 6,25 or 6,38 for plants or protein (and the N-content in protein is most of the times close to 16%);
- N-free: the rest (sugars, starch, pectines, organic acids ...).
This data is often more readily available than a full chemical analysis.
I want to know the sulphur content - can I reliably say fats contain v mass-% sulphur, proteins x mass-% ... and so on? If yes, would this be applicable to manure also?