TY  - BK
AU  - Singh,B.
AU  - Brar,S.P.S.
TI  - Long-term effect of NPK and Zn fertilization in maize-wheat rotation on crop yield and soil characteristics (1970-1984)
T2  - Research Bulletin
PY  - 1986///
CY  - Ludhiana (India)
PB  - Punjab Agricultural University, 
KW  - Crop management
KW  - AGROVOC
KW  - Fertilizer application
KW  - Fertilizers
KW  - Npk fertilizers
KW  - Soil chemicophysical properties
KW  - Triticum
KW  - Rotational -
KW  - Término tomado de AGROVOC
KW  - Zea mays
KW  - Yields
ER  -