Abstract
Abstract A pattern of diurnal fluctuation in the nitrate concentration of young field grown beets (Beta vulgaris L.) was established. Plants assayed every 4 hours over a 52-hour period in late May showed greater than 2-fold differences with maximum concentrations at 4 am and 8 am and minimum concentrations at 4 pm. Thus, adjustments in harvest time may help minimize nitrate levels in vegetables. Moreover, diurnal fluctuations should be taken into account when predicting the adequacy of soil nitrate levels by tissue analysis.
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