Effect of nitrogen fertilization application on simulating wheat (Triticum aestivum) yield loss caused by wild oat (Avena fatua) interference.

A field experiment was conducted to quantify the effect of nitrogen fertilizer on wheat yield loss due to wild oat interference and on crop-weed competition. The experiment was designed as a randomized complete block with a split plot arrangement with nitrogen fertilizer ( N , unfertilized control; N , 150 N Kg ha before 01 1 before crop seeding resulted in a greater higher competitive ability of wild oat than other treatments. The slope (b) of the linear model representing the relationship between wild oat density and relative wild oat biomass significantly greater when nitrogen fertilizer applied. Information gained in this study will be utilized to develop a more integrated program for weed management in spring wheat.