00552    a2200157   4500082001800000100002500018245009800043260006600141300002000207440002600227650003100253650003200284650003500316700001900351700002400370  a631.5818bABE  aAbeyratne, Fredrick   aShifting farming btowards stabllity b a study of four rainfed farming systems in Sri Lanka   aColombobAgrarian Research and Training Institutec1986g1986  avii,148p.c29cm  aResearch study No. 66  aCULTIVATION AND HARVESTING  aREDUCED CULTIVATION METHODS  aSPECIAL METHODS OF CULTIVATION  aTennakoon, D.   aGunasena, H. P. M.