The influence of different nitrogen and potassium fertilisation on the chemical flavour composition of kohlrabi (Brassica oleracea var. gongylodes L.)

abonos aroma azote brassica oleracea gongylodes chou rave compuestos del sabor engrais fertilizers flavour compounds kohlrabi metabolism metabolisme metabolismo nitrogen potasio potassium racine roots thiocyanate thiocyanates tiocianatos volatile compounds