- A (current)
- B (current)
- C (current)
- D (current)
- E (current)
- F (current)
- G (current)
- H (current)
- I (current)
- J (current)
- K (current)
- L (current)
- M (current)
- N (current)
- O (current)
- P (current)
- Q (current)
- R (current)
- S (current)
- T (current)
- U (current)
- V (current)
- W (current)
- X (current)
- Y (current)
- Z (current)
- Humus
-
sostanza propria del terreno, costituita da particelle di terra inframmezzate a sostanza organica (cioè composti di carbonio, idrogeno, ossigeno, azoto) in fase avanzata di decomposizione a opera dei microrganismi del terreno stesso, e a sostanza inorganica (cioè sali minerali) che è già disponibile per l’assorbimento da parte delle radici.