Sortenvergleich zum Gehalt an Nitrat und anderen qualitätsbestimmenden Inhaltsstoffen in Kopfsalat und Spinat Comparisson of cultivars regarding the content of nitrate and other quality components in butterhead lettuce and spinach = Comparison of cultivars regarding the content of nitrate and other quality components in butterhead lettuce and spinach - Behr, Ursula (1988)