(1983) and Stopes et al. (1989) who found the
lower nitrate concentration in spinach grown organically. According
to Shokrzadeh et al. (2007), spinach contains 24.0–457.0mg
NO3
− kg−1 and further was stated by Barker (1975) that organically
grown spinach gives lower crop nitrate concentrations due to
a slower mineralization rates. Further, Fujiwara et al.