TY  - BOOK
AU  - Ahmed,Osumanu Haruna
TI  - Humic substances and urea: use in agriculture 
SN  - 9789673444069
PY  - 2014///]
CY  - Serdang, Selangor
PB  - Univesiti Putra Malaysia Press
KW  - Humic acid
KW  - Organic fertilizers
KW  - Soils
KW  - Composition
ER  -