Paper Title
The Effects of Phosphorus Application and Rate on Soybean Physiology and Growth Under Drought Stress

Abstract
Phosphorus (P) is a majorly important nutrient for plants; it affects plant's both physiology and production. P helps plants better cope with some unfavorable conditions such as drought stress which can lead to serious malfunctions in plant's growth lifecycle, especially if the plant is known to be drought-susceptible as in the case of soybean.To investigate sole and compound effects of P and drought stress, an experiment was conducted in Debrecen, Hungary in 2018; two soybean cultivars were supplied with three P rates (0, 45 and 90 kg ha-1 P2O5) under irrigated and drought-stressed regimes. Results of both cultivars showed that 45P treatment resulted in noticeably higher plant height, total dry matter and biomass, regardless of irrigation regime, whereas 90P did not lead to measurable enhancements under drought stress conditions for Boglár cultivar; however, it could enhance traits under irrigated regime. On the other hand, 90P slightly reduced all studied traits as compared to 45P treatment under both irrigation regimes for Pannonia Kincse cultivar. Drought stress had a clear negative effect on studied traits, regardless of P application and rate.It was concluded that P can enhance soybean physiology and growth under both irrigated and drought-stressed conditions; however, different cultivars respond differently to P application. Drought stress negatively affects soybean growth which will probably reflect on the final yield's quantity and/or quality. Keywords - Drought stress, P fertilizer, physiology, soybean.