This research was take place during the two successive growing seasons of 2022/2023 and 2023/2024, at the Floriculture Farm, Faculty of Agriculture, Minia University, to evaluate the effect of compost percentages (0, 5, 10 and 20 %, w/w) and mineral fertilization treatments (5.5, 11 and 16.5 g NPK/pot, 25 cm diameter) as well as their interactions on vegetative growth parameters of Antirrhinum majus, L.
All percentages of compost significantly increased vegetative growth parameters (plant height, stem diameter, number of branches and leaves/plant, leaf area, and plant and root system fresh and dry weights) relative to untreated plants. In all cases, 20% compost was significantly superior to other used treatments.
Mineral treatments significantly increased all aforementioned characters facing the check treatment. In all cases, the treatment of high dose, followed by medium dose gave high values without significant differences between them.
The best interaction treatment was supplying snapdragon plants with 20% compost in combination with 16.5 or 11 g mineral NPK/pot.