TY  - BK
AU  - Hobbs,P.R.
TI  - Yield sustainability in rice-wheat rotations
PY  - 1987///
KW  - Cropping systems
KW  - AGROVOC
KW  - Experimentation
KW  - Pakistan
KW  - Rice
KW  - Soil resources
KW  - Statistical data
KW  - Sustainability
KW  - Wheat
KW  - Yield factors
ER  -