TY  - BOOK
AU  - Chatterjee,B.N.
AU  - Maiti,S.
AU  - Mandal,B.K.
TI  - Cropping system: Theory & practic
SN  - 812040419x
U1  - 631.58201 22
PY  - 1989///
CY  - New delhi
PB  - Oxford & IBH publishing co.pvt.ltd.
KW  - Agronomy
KW  - Cropping
UR  - s://books.google.com.bd/books?id=z46cMwEACAAJ&dq=cropping+system+theory+%26+practice&hl=en&sa=X&ei=esOjVMTxO9GcugSd0oLgCQ&ved=0CCQQ6AEwAQ
ER  -