Our findings of reduced yields with limiting N and S supply are in line with the body of evidence from other studies. Hence, at harvest time, the head weight differed as a conse- quence of the amount of N and S supplied. Plants receiving an optimal amount of N had a higher average head weight (213.89 ± 22.75 g) as compared to those supplied with an insufficient amount of N (72.60 ± 8.33 g) (Fig. 1).