Agricultural experiment carried out during the 2014-2015 agricultural season winter wheat planting classAba99in tow sites Al-Shattra and Al-Dwayah in Al-Naseriah Explanatory farmers' fields covered by the national program for the development of the cultivation of wheat in Iraq and four treatments were applied on wheat(Laser plus weed controlling, Laser plus weed controlling plus sulfur, Laser plus weed controlling plus sulfur plus other elements, Control for comparing), in Randomized Complete Block Design RCBD with three replications, Correlations and path coefficient analysis between (number of brunches, Spike Length, number of spikes/m2, grains number per spike, thousand grain weight and plant grain yield),
Results showed that grain yield had a positive significant correlation with each of number of spikes/m2 and grains number per spike (0.711**, 0.465**) respectively.
Results of path coefficient analysis showed that the direct effect of number of spikes/m2 on grain yield was high and positive(0.5350), while the indirect effectsfor each of number of brunches and number of grains per spike and thousand grain weight on grain yield wasmedium and positive (0.2571, 0.2557, 0.2434) respectively, and also the indirect effect for grain number per spike on grain yield through number of spikes/m2 was positive and medium(0.2479).
Results also showed that number of spikes/m2 had the highest contribution in yield as a direct effect 28.621%, followed by the corporate effect of number of spikes/m2 and number of grains in spike12.674%.