na INLIS000000000038342 Ind 0010-0119003255 Modelling minimum residue thresholds for soil conservation benefits in tropical, semi-arid cropping systems PROBERT, M.E. M.E. Probert Canberra ACIAR 2007 34 p. : ill. ; 24 cm.-- 34 p. : ill. ; 24 cm.-- Sr. 631.6.02:631.45 Sr. 631.6.02 SOIL CONSERVATION RESIDUAL EFFECTS CROPPING SYSTEMS SOIL FERTILITY 493/MS/2007