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In order to study the influence of NPK fertilization levels (0.0, 50, 75 and 100 of recommended dose), humic acid rates (0.0, 2.0 and 4.0 l/fed. as foliar spray) and their combinations on growth and productivity of roselle, two field experiments were conducted for two summer seasons of 2017 and 2018 at the Experimental Farm of Faculty of Agriculture (Ghazala Farm), Zagazig University, Egypt. The recommended dose (RD) of NPK were (N fertilizer at 68 + P2O5 fertilizer at 32 + K2O fertilizer at 24 kg/fed.). The experimental design was split-plot which arranged in three replicates. Furthermore, the obtained results referred that the highest values of plant height, number of branches/plant and total dry weight/plant were achieved with 100% of RD compared to the other levels. Also, the same trend were obtained toward the yield components (fruit number/ plant, sepals and seed yield per plant and per fed.) and chemical constituents (N, P and K percentages as well as total soluble solids). In addition, the highest values of abovementioned parameters were recorded by 4 l Fed. humic acid which followed by 2 l Fed. humic acid with significant difference between them and control (untreated plants). Generally, it could conclude that humic at 4 l/fed. combined with 100% RD, showed a uniform influence in enhancing of roselle growth and its productivity under Sharkia Governorate conditions.

Influence of different NPK fertilization levels and humic acid rates on growth, yield and chemical constituents of roselle (Hibiscus sabdariffa L.)