Effect of nitrogen rate and the density of plant population on yield and yield components of sunflower helianthus annuus
Karami, E.
Indian Journal of Agricultural Sciences 50(9): 666-670
1980
ISSN/ISBN: 0019-5022
Accession: 005256992
In a field experiment conducted 1973-1976, application of 50 kg N/ha increased the yield, plant height, heat diameter, 100-seed weight and percentage of unfilled achenes in sunflower (H. annuus Linn.). Higher rates of N produced no additional significant responses on yield or yield components. The percentage of oil in the achenes decreased with an increase in N and with more plants per hill. Plant height, heat diameter, 100-seed weight and percentage of unfilled achenes increased with wider spacing between plants and decreased with more plants per hill. The highest sunflower yield was obtained with wider spacing between plants and more plants per hill. Oil percentage was correlated negatively with N levels and positively with the number of plants per hill. Seed weight was correlated positively with head diameter and negatively with the number of plants per hill.