Evaluation of the yield and photosynthetic parameters of corn by some amendatory materials under deficit irrigation conditions

Abstract Irrigation is essential for corn plants. Because this plant is a summer crop, irrigation is critical to its production, and an absence of moisture is a significant constraint on its development. This study aimed to investigate the impacts of hydrophilic polymer (HP) and fulvic acid (Fu-A) as amendatory materials on yield, yield component, and photosynthetic parameters of corn plants under the deficit irrigation (DI) situation. The treatments were performed by mixing two water provision groups, including complete irrigation (CI) and DI, two soil improvements, including the application of without HP or with HP, and two foliar amendments, including spraying without Fu-A or with Fu-A, with four replications. According to the results, under DI and CI situations, the co-treatment of two amendatory materials, Fu-A and HP, enhanced corn yield significantly. These enhancements were higher than enhancements attained by using them alone. Besides, the moisture and leaf proline available for the plant during DI circumstances were increased by utilizing both amendatory materials. Under DI treatment, using Fu-A and HP amendatory materials together may thus be more significant and beneficial for increasing production and boosting photosynthetic mechanisms.