Txhua cov chiv, organic-based lossis hluavtaws, muaj NPK tsom rau ntawm lub hnab. Cov tsiaj ntawv yog cov tsiaj ntawv luv luv rau txhua cov khoom noj, nitrogen (N), phosphorus (P), thiab potassium (K). Cov lej qhia qhov feem pua ntawm txhua qhov khoom noj hauv lub hnab ntawd. Yog tias muaj xoom, tej zaum yuav muaj tsawg dua 1 feem pua ntawm cov khoom noj ntawd. NPK tsom xam rau Milorganite, piv txwv li, yog 6-4-0: 6 feem pua nitrogen; 4% phosphorus; thiab, 0 feem pua poov tshuaj, qhia tias muaj tsawg dua 1 feem pua poov tshuaj.
