Abstract:
An experiment was conducted at the College of Agriculture, Vellayani
to study the effect of graded doses of nitrogen and phosphorus on the uptake
of nitrogen and phosphorus at three growth stages of sunflower viz 20th day
after planting, flowering and harvest. The effect of nitrogen up to 90 kg/ha
resulted in significant linear increase in nitrogen uptake at all the stages except
on the 20th day after planting. Phosphorus at 90 kg level showed significance
in enhanced nitrogen uptake at the 20th day of planting but not later. While
for the phosphorus uptake, significant effect was noticed due to increased levels
of application of nitrogen at all the three stages, levels of applied phosphorus
did not bring about significant changes in the uptake of this nutrient Increase
in uptake of these nutrients showed a linear relationship with the magnitude
of growth of the plants.
