The objective of this experiment was to investigate yield, yield components and quality of three flax genotypes (Sakha 3, Sakha 5 and Giza 11) under different sulphur fertilization levels (0, 25.0, 37.5, 50.0 and 62.5 kg/ha). Split-plot design was used for the experiment with four replicates. The main-plots were assigned to the five fertilization levels of sulphur and the sub-plots were allocated to the three flax genotypes. Application of 50.0 kg sulphur/ha significantly increased most of the studied characters i.e. technical length, straw yield/plant, straw yield/ha, fruiting zone length, number of capsules/plant, seed yield/ha, fiber length and fiber yield/ha in both seasons. Results also showed that Giza11 significantly surpassed other genotypes in technical length, stem diameter, straw yield/plant and per hectare, seed index and fiber length, whilst Sakha 3 was superior in fiber percentage and fiber yield/ha in the first and second seasons, respectively. Sakha 5 genotype recorded the best results for fruiting zone length, number of capsules/plant and seed yield/ha in both seasons. Therefore, this study recommends using fertilization level of 50.0 kg sulphur/ha with Giza11 for the best straw yield/ha, Sakha 3 for the best fiber yield/ha and Sakha 5 for the best seed yield/ha.
Keywords: Flax genotypes, sulphur fertilization, straw yield, seed yield, fiber yield