investigation of nutritional effects of nitrogen, boron and sulfur on quantitative and qualitative charactristics of safflower grain (carthamus tinctorius l.)

in order to study the effects of nitrogen (n), boron (b) and sulfur (s) on yield, yield components, oil and protein content of safflower (carthamus tinctorius l.) an experiment was conducted in research station, college of agriculture, shahid bahonar university of kerman, using a local variety’’ isfahan’’. a randomized complete block design with three replications was used. treatments were all combination of nitrogen at 3 levels (46, 92 and 138 kg/ha as pure nitrogen) from urea source, boron (0 and 0.7 kg/ha as pure boron) from boric acid source and sulfur (0, 150 and 300 kg/ha as sulfur) from powder sulfur source were randomly distributed in each block. results showed that increasing nitrogen level increased seed yield, number of head and protein content of the seeds (p