00437     2200145   4500001002100000008003900021035002000060245005800080100002000138260006700158300002000225084001900245082001300264990001400277INLIS000000000000148                                   N    a0010-0317000146  aA methodology for on - farm cropping systems research  aZandstra, H. G.  aPhilippines :bThe International Rice Research Institutec1981  a142 hlm.c22 cm  a631. 072 Zam m  a631. 072  a002882112