The limits of disc injection stretched with a working width from 3.3 to 5.7 m : from 11 to 19 discs (inter-row 30 cm), special for grassland, possibility of using a grinder-distributor, emptying rate from 5 m³/ha, high quality of work, quality crosswise distribution above 10 m³/ha, side dispersal of slurry up to 15 cm, work depth from 6 to 10 cm, no more odours or nitrogen losses.