Effect of interaction between seaweed extract and max unique humate on some vegetative growth indicators of Linum usitatissimum L.

Abstract

This experiment was applied to study the effect of the interaction between seaweed extract and max unique humate on some vegetative growth parameters of flax plants during the 2025-2026 seasons. A randomized complete block design (RCBD) was used as a factorial experiment with three replications at a probability level of 5%. The first factor (seaweed extract) was applied by spraying at four levels (0, 1, 2, and 3) mL/L, designated A0, A1, A2, and A3, respectively. The second factor (max unique humate fertilizer) was applied to the soil at four levels (0, 12, 16, and 20 kg ha⁻¹), designated H0, H1, H2, and H3, respectively. The results showed that the addition of seaweed extract and max unique humate fertilizer significantly affected some vegetative growth indicators, namely (plant height (cm), root system dry weight (g), and chlorophyll content). The significance of the effect increased with increasing levels of added fertilizer. The H3 treatment (20 kg ha⁻¹) yielded the highest values for the studied traits (60.79 cm, 17.57 g, 30.32 g, respectively), compared to the H0 treatment (no addition), which yielded (39.10 cm, 11.97 g, 22.10 g, respectively). Similarly, the A3 seaweed extract (3 ml L⁻¹) yielded (60.37 cm, 16.17 g, 29.72 g, respectively), compared to the control treatment A0 (0 ml L⁻¹), which yielded (38.08 cm). 13.62 g, 22.87 g) respectively. The interaction between the two factors (A3H3) resulted in the highest significant increase in most of the studied indicators, yielding (70.48 cm, 19.09 g, 33.09 g) respectively, compared to the interaction treatment (A0H0), which yielded (31.22 cm, 10.09 g, 20.09 g) respectively.