Indonesian

Abstract

Solikin. 2015. Effect of seedling height and dosages of urea fertilizer on growth of Stachytarpheta jamaicensis. Pros Sem Nas Masy Biodiv Indon 1: 1177-1181. Stachytarpheta jamaicensis (L.) Vahl belongs to the family Verbenaceae which has potential as ornamental and medicinal plants. The study aimed to determine the effect of seedling height and dosage of urea on the growth of S. Jamaicensis. The research was conducted in Purwodadi Botanic Garden using a split-plot experimental design with two treatments. Three different seedling height namely 29 cm (H1), 24 cm (H2) and 16 cm (H3) were considered for first treatment in the main plots and five various doses of fertilizer such as 0 g/plant (D0), 0.4 g/plant, (D1), 0.8 g/plant (D2), 1.2 g/plant (D3) and 1.6 g/plant (D4) were applied for second treatment in the subplot. Each combination of treatment was replicated three times. The seedlings were planted in polybags with 13 cm diameter and 16 cm height, which were filled with garden soil of Purwodadi Botanic Garden. The plants were placed in the plastic lid with about 20% light penetration and arranged with a spacing of 25x25 cm2. The urea fertilizer was given once two weeks after planting in 5 cm hole from the stem base. Since then an observation on different variables such as plant height, leaf number, shoots number, spike number and plant dry weight were conducted every 2 weeks. The results showed there is an interaction between the seedling height and dosages of urea to the plant height, leaf number, shoots number, spike number, and plant dry weight. The highest dry weight, 8.88 g/plant, was obtained at H1D4 treatment (height 29 cm and dosage of urea 1.6 g/plant).