Response of Grain Yield and Yield Components of Triticale to Sowing Date and Plant Density

In order to study of sowing date and plant density on Triticale (Tritico secale), a field experiment was carried out under dry farming in the Rice Research Institute of Iran, during 2008-2009. The experiment was conducted as a RCBD based split-plot design with three replications. Experimental treatments included: Four sowing date (Sept. 21, Oct. 1, Oct. 10, and Oct. 20) as main plot and four plant density (275, 350, 425 and 500 plant/m2) composed of as sub plots, respectively. Results indicated that plant density was significant effect on tiller number/plant. The highest number (13.6 tiller/ plant) was obtained in 275 plant/m2 seed density. The results showed, spike length and plant dry matter was affected only by sowing date. The highest dry matter and the longest spike were produced on Sep. 21. Result of the experiment revealed that grain yield, spike number per plant and harvest index significantly affected by sowing date× plant density interaction. However, planting 500 plant/m2 in Sept. 21 resulted to highest (5863 Kg ha-1) grain yield and 275 plant/m2 seed in Oct. 21 resulted the lowest (3351.08 Kg ha-1).