Abstract:
This investigation was conducted in order to study the effect of levels and frequency of nitrogen
application on the nodulation of groundnut in the regosols. The experiment tested five levels of
nitrogen (0, 15, 30, 45 and60 kg/ha). A uniform application of 15 kg N/ha, 45 kg K O/ha and 60
kg P /ha was made as basal dressing. Topdressing at the rate of 15, 30 and 45 kg N/ha was
done either as a single application or in two split doses. There was a significant increase in
nodulation at lower level of nitrogen i.e. upto 30 kg/ha thus emphasizing that a minimal amount
of applied nitrogen is necessary for nodulation. There was also an indication of reduction in
nodulation at the highest level of nitrogen tested.