[Sowings to the starting point [Glycine max - maize - Helianthus annuus - tillage - planting equipment in Italy]]

azadas compactage du sol compattamento del terreno crop residues cultivadores rotativos cultivateur rotatif date de semis dent d'outil epoca di semina erpici fecha de siembra fertilizer equipment fresatrici glycine max harrows helianthus annuus herse hoes houe italia italie italy labor superficial lavorazione superficiale potassium sulphate preparazione del letto di semina rastra residui colturali residuos de cosechas rodillos rollers rotary cultivators rouleau rulli seedbed preparation seminatrici semoir soil compaction solfato di potassio sowing date sulfate de potassium sulfato de potasio superfosfato superphosphate surface cultivation tines tractores de ruedas vibrocultivadores wheeled tractors zappe zea mays