Bread Wheat Productivity in Response to Humic Acid Supply and Supplementary Irrigation Mode in Three Northwestern Coastal Sites of Egypt

Drought stress is a major factor limiting wheat crop production worldwide. The application of humic acid (HA) and the selection appropriate genotype in suitable site one most important methods tolerance plants to drought-stress conditions. aim this study was achieved using three-way ANOVA, index (STI), Pearson correlation coefficient (rp), principal component analysis (PCA). Three field experiments three sites (Al-Qasr, El-Neguilla, Abo Kwela) during 2019/21 2020/21 seasons were conducted, entailing Egyptian bread variety (Sakha 94) with HA rates (0, 30, 60 kg ha?1) under normal conditions (supplemental irrigation). According sites, supplemental irrigation, rates, their first- second-order interactions grain yield traits evaluated (p ? 0.05 or 0.01) significantly influenced both seasons. drastically reduced all registered factors studied compared at Al-Qasr showed increased that other promoted drought stress, highest when applying ha?1, regardless site. greatest monitored observed fertilized ha?1 Grain correlated water precipitation use efficiency as well results STI, rp, PCA from current could be useful used method for studying drought-tolerance mechanisms improve productivity. Based on statistical study, we recommend productivity along north-western coast Egypt.