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Distribution of nitrate nitrogen in the blades and petioles of sugar beets grown at deficient and sufficient levels of nitrogen


, : Distribution of nitrate nitrogen in the blades and petioles of sugar beets grown at deficient and sufficient levels of nitrogen. J Amer Soc Sugar Beet Technol 14(2): 106-116

Sugar beets were grown for 96 days in nutrient solutions containing deficient and non-deficient amounts of N. Nitrate concentrations of blades and petioles increased from low values in the younger. leaves to increasingly higher values in older leaves regardless of N in the nutrient solution. Nitrogen deficiency occurred in the young immature leaves, even though there was an ample supply of NO3 in the older leaves. This lack of rapid movement of NO3 is unusual and implies that a continuous supply of NO3 must be available to the plant if a nitrogen deficiency of the younger leaves is to be prevented in sugar beets. Plants receiving sufficient N had a NO3 content of 42,000 ppm in the oldest petiole.

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