A field experiment was carried out at the Experimental Farm, faculty of Agriculture, Menoufia University, Egypt, during 2019/2020 and 2020/2021 seasons to study the effect of surface irrigation systems (basin irrigation, bed irrigation and gated pipes) and foliar application of growth stimulants (control, amino acids, humic acid, compost tea, seaweed extract and yeast extract) on yield and grain quality of bread wheat (Giza 171). Irrigation systems significantly affected in most characters studied. Using gated pipes was superior to the other irrigation systems in yield and its components (number of spikes/ m2, spike length, number of grains/spike, 1000-grain weight, spike weight, grain yield /fed and straw and biological yields/fed) and grain quality (protein, wet and dry gluten %) especially basin irrigation which recorded the lowest values. The differences among irrigation systems did not reach the level of significance for moisture, ash, fats and fiber percent in grains.
Foliar application of yeast extract or seaweed extract exhibited superiority in all yield and its components as well as grain quality (protein, wet and dry gluten %) in comparison with other tested growth stimulants especially control. Treated plants with compost tea and untreated plants recorded the highest carbohydrates in grains. However, moisture, ash, fats and fiber percent in grains did not significantly affect by various growth stimulants.
It could be concluded that irrigated plants with gated pipes and treated with yeast extract was the best combination treatment for maximizing grain yield under similar environmental conditions of the experiment site.