Abstract
Abstract Growth of radish (Raphanus sativus L.) was inhibited by NH4 as the source of N at concentrations from 1 to 240 ppm N. Higher levels of free NH4 accumulated in the plants as a result of NH4 nutrition. Nitrate equivalent to 10% or more of the NH4 concentration alleviated the inhibitor effects of NH4 on growth and also decreased the NH4 content of the plants. Five cultivars of radish responded similarly. Ammonium was also harmful for growth of etiolated seedlings, but NO3 did not reverse the inhibitory effects of NH4.
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