Effects of Phosphorus on Growth and Development, and Quality of Crown of Thorns (<I>Euphorbia milii</I>)
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Abstract
Phosphorus (P) is an important nutrient for the growth and quality of ornamental plants. The aim of this study was to investigate the effects of phosphorus on the growth and flower quality of crown of thorns. The experimental design was conducted in a completely randomized design (CRD) with three replications and six treatments. Treatments were T1 as control (no P fertilizer); T2 to T6 consisted of P fertilizer at the rates of 25, 50, 100, 200 and 400 mg P2O5 per kg (growing media), respectively. The results showed that the application of P fertilizer at different rates resulted in significant differences in chlorophyll a and total chlorophyll (P < 0.05). Plant height and total phosphorus concentration were not significantly different (P > 0.05). The increase in P fertilization clearly affected the number of flowers per plant. Application of P fertilizer at the rate of 400 mg P2O5 per kg (growing media) resulted in the highest number of flowers per plant (8.67 ± 2.31 flowers per plant). On the other hand, an increase in P fertilizer decreased the flower diameter of the crown of thorns. The application of P fertilizer at a rate of 100 mg P2O5 per kg of growing media yielded comparable outcomes in terms of flower diameter, number of inflorescences, and number of flowers per plant as the treatment that generated the most favorable results. Therefore, the application of P fertilizer at the rate of 100 mg P2O5 per kg (material) was appropriate for planting crown of thorns.
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