TY  - BOOK
AU  - IPNI
TI  - Nutrient expert maize: a 4R fertilizer recommendation tool for smallholder farmers of south Asia
U1  - IPNI/HB 
PB  - International Plant Nutrition Institute
KW  - Handbook
N1  - Nutrient expert-maize: a four R fertilizer recommendation tool for smallholder farmers of south Asia
ER  -