Two field experiments were carried out at the Experimental Farm and in the Laboratory of Horticulture Department Faculty of Agriculture at Moshtohor, Benha Univ., during 2018/2019 and 2019/2020 seasons to study the effect of some fertilizer treatments (chemical, organic and bio-fertilizers) on vegetative
growth, essential oil productivity and some chemical constituents of chia (Salvia hispanica L.) plants. Obtained results showed that: The tallest plant was gained by T2 (100 % R.D. chemical NPK) followed in descending order
by T3 (75 % R.D. chemical NPK + 25% organic + bio) in the two seasons. The greatest number of branches and the heaviest fresh and dry weight of herb per plant of chia were gained by T3 treatment, followed by T2 treatment.
The heaviest fresh and dry weights of inflorescence per plant, the heaviest 1000 seeds and seeds weight / plant of chia plants were scored by T3 treatment, followed by T2 treatment in the two seasons. The greatest herb oil
percentage of chia was scored by T4 (50 % R.D. chemical NPK + 50% organic + bio) treatment, followed by T3 treatment. The greatest fixed oil yield per plant and per fed. of chia were scored by T3 treatment, followed by T2 treatment in the two seasons. The highest herb chemical constituents of chia plants were recorded by T2 and T3 treatments in the two seasons.