Fig. 4

(a, b and c). The effects of treatment with humic acid or fulvic acid and different rates of the recommended dose of phosphorus fertilizer (RDP) on the uptake of N, P, and K in grain (kg/ha) of barley cultivar Giza 123 in the seasons 2018/2019 and 2019/2020. Different letters associated values indicate significant differences between values at p≤ 0.05 according to Duncan's multiple range test