Abstract:
An experiment using three varieties of sunflower and three levels of nitrogen
was conducted at the College of Agriculture, Vellayani during 1974 in order to assess the performance of sunflower varieties under different levels of nitrogen.
The varieties tried were EC.68413, EC. 6841 4 and Sunrise selection. The levels
of nitrogen were 40 kg, 90 kg and 120 kg per hectare. The results indicated
that there was no significant difference among the varieties in plant height, total
dry matter production, leaf area index net assimilation rate, lodging, head diameter,
number of seeds per head, percentage of filled grains per head, 1000 seed
weight and yield of seeds. But, there was significant difference in the yield of
atover and oil and protein contents of seeds among them. The effects of incremental
doses of nitrogen were significant in head diameter and yield of seeds.
Maximum yield of 1887.1 kg seeds per hectare was obtained at 80 kg nitrogen
per hectare.
