Abstract:
An experiment was conducted in red loam soils of the farm attached
to the Agricultural College Vellayani, with the object of studying the effect of
applied nitrogen and phosphorus on the nodulation in groundnut. The levels
of nitrogen were 0, 10 and 20 kg/ha and those of phosphorus 0, 25, 50, 75,
and 100 kg/ha. The number and dry weight of nodules per plant observed at three
stages of 2, 4, and 6, weeks after planting were studied. Application of nitrogen
significantly reduced and the phosphorus application significantly increased
the mean number and dry - weight of nodules at all the three stages of
observation. It was also noticed that both the mean number and dry - weight
of nodules have increased from the first stage of observation to the second stage
and thereafter decreased in the third stage.
