The experimental design was a split factorial on the basis of completely randomized block design with three replications at the expermintal field of the Islamic Azad University, Shahr-e-Qods Branch, Iran in 2009. The planting dates (1 March, 15 March and 1 April) were assigned to the main plots and the combination of compost including 5, 10, 15 and 20 ton ha-1 and the chemical fertilization systems (N1P1K1 = 160, 128, 160; N2P2K2 = 120, 96, 120; N3P3K3 = 80, 64, 80; N4P4K4 = 40, 32, 40 respectively) were factorially assigned to the subplots. The chemical fertilization systems and compost significantly increased the mucilage percentage, flower yield, grain yield, root dry weight, plant height, flower number per plant and thousand seed weight in borage. Although, the planting date treatment significantly increased the plant features and the highest mucilage percentage (9.4%) was achieved under the treatments of 1 March and N1P1K1. It can be stated that compost is able to enhance the growth of borage under chemical fertilization systems enhancing NPK uptake.
Key words: Planting date, chemical fertilization system, compost, mucilage, borage.
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