EFFECT OF NPK AND HUMIC ACID ON GROWTH, FLOWERING AND CHEMICAL COMPOSITION OF (BLUE SAKE) ERANTHEUMUM PULCHELLUM ANDREWS PLANT

In this study the treatments were carried out as follows: Control; Full dose of NPK containing 6 g ammonium sulphate (20.5%N) + 4 g calcium super phosphate(15.5%P2O5) + 3 g potassium sulphate (48.5%K2O) to 8 kg soil in the pot; Half NPK dose; Half NPK dose + 50 ppm (HA); Half NPK dose + 100 ppm(H.A.); Half NPK dose + 150 ppm (H.A.); as well as (H.A.) at 50,100 and 150 ppm. The obtained results showed that most treatments resulted significantly taller plants, higher branch and leaf plural, wider leaf area compared to control with 1/2 NPK + 150 ppm (H.A.) treatment providing the best results as this treatment gave also the high significant. Additionally, this treatment caused significantly the earliest flowering with the longest flower stem, widest flower diameter, number of flowers per plant as well as the heaviest fresh and dry weight of flowers. Most treatments gave significantly higher total chlorophyll in the leaves than the control with the superiority of the treatment of 1/2 NPK + 150 ppm (H.A.) followed by the treatment of NPK alone with non-significant differences in between. N ratio in the leaves significantly increased over control in most treatments and especially for the treatment of 1/2 NPK + 150 ppm (H.A.). P ratio in the leaves were significantly the highest as a result of the NPK treatment with no other additives. While the highest K ratio resulted from the treatment of either 100 or150 ppm (H.A.) without significant differences in between. However, the treatment of 1/2 NPK + 150 ppm (H.A.) is recommended to obtain high quality plants.