Humus: origin, chemical composition, and importance in nature

I tiakina i:
Ngā taipitopito rārangi puna kōrero
Kaituhi matua: Waksman, Selman A (Author)
Hōputu: Pukapuka
Reo:Ingarihi
I whakaputaina: Baltimore Williams and Wilkins 1938
Putanga:2a. ed
Ngā marau:
Ngā Tūtohu: Tāpirihia he Tūtohu
Kāore He Tūtohu, Me noho koe te mea tuatahi ki te tūtohu i tēnei pūkete!