Response of Rose Growth and Flowering to NPK and Potassium Silicates Application and Spraying with Magnesium

Abstract

This study was conducted in a lath house, Dept. Of Hort. and Landscape, College of Agricultural Engineering Sciences, Univ. Baghdad, Al-Jadriya during 2022 growing season to investigate influence of mineral fertilizers NPK, potassium silicate and spraying with magnesium (Disper Mg) on some vegetative growth characteristics and flowering of one year’s old of Wiener Charme rose cultivar. Factors of study experiment included addition of two levels of mineral fertilizers NPK (without addition (C0) and 5 g.transplant^-1 (C₁₀₀), while potassium silicate was added with three levels; without added (S₀), adding at 200 mg.L^-1 (S₂₀₀) and adding at 300 mg.L^-1 (S₃₀₀), As for magnesium fertilizer treatments, they were sprayed in three levels (0, 7.5, and 15 g.L^-1), which are denoted by symbols M₀, M_7.5, and M₁₅, respectively. Treatments were replicated three times (four plants in experimental unit) at factorial experiment in a RCBD and thus number of plants used was 216 plants. The experimental results showed that chemical fertilizers at 5 g.L^-1(C₁₀₀) significantly increased in plant height of 16.24 cm, leaf nitrogen content of 1.287 %, leaf phosphor content of 0.349 %, flowers number of 17.64 flower.plant^-1 and floral stem length of 20.33 cm. Results also showed that potassium silicate application, showed significant superiority in increased in plant height of 18.66 cm, leaf nitrogen content of 1.286 %, leaf phosphor content of 0.374 %, flowers number of 17.25 flower.plant^-1 and floral stem length of 20.04 cm. Magnesium spray especially spraying at 15 g.L^-1 excelled in increasing of plant height of 16.07 cm, leaf nitrogen content of 1.289 %, leaf phosphor content of 0.367 %, flowers number of 17.08 flower.plant^-1 and floral stem length of 20.62 cm. Twice and triple interactions between study factors significantly affected in all studied traits.