Abstract ‘Cutler’ soybeans ( Glycine max (L.) Merr.) were grown for 6 weeks after emergence in a gravel culture system to evaluate the effects of applied N on nodulation and early growth. Treatments included inoculated plants supplied 10 meq/liter NO 3 – for 0, 2, 4, and 6 weeks from the time of emergence and uninoculated plants supplied N for 6 weeks. Dry weight of inoculated plants receiving N for 0 and 2 weeks was significantly lower than that of inoculated plants receiving N for 4 and 6 weeks. Dry weight of the stems and leaves was the same for the un‐inoculated plants receiving N for 6 weeks as for the inoculated plants receiving N for 4 or 6 weeks. The number of nodules was increased by the addition of N for 2 weeks following seedling emergence. Total N in the stem and leaves was the same for the inoculated plants supplied N for 4 and 6 weeks as for the uninoculated plants with N. These results provide evidence of the importance of soil N for the initial growth of soybeans, even in the presence of adequate inoculation.
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Hatfield et al. (1974) studied this question.