**5. Conclusions**

The SCU fertilizer was applied at a recommended rate (130 kg ha<sup>−</sup>1) to increase wheat stress tolerance. The experiment presented the positive possessions of SCU on wheat growth and development, physiological conditions, and nitrogen accumulation under different abiotic stress conditions. After 120 days, all stress types significantly (*p* < 0.05) reduced plant growth (leaf area, dry biomass, SPAD value, and the number of tillers). However, the crop yield was most compromised in the cases of heat and combined stress. The heat stress showed the lowest grain yield of 3623.47 kg ha<sup>−</sup>1, while waterlogging stress showed a better yield of 6034.5 kg ha−<sup>1</sup> in all stresses.

SCU, used in the current study, has a controlled nitrogen release time that meets nitrogen requirements for up to 120 days only. Hence, the wheat plant was able to tolerate salt and waterlogging stress to some extent. However, once the nitrogen source was exhausted at the time of heat stress, the plant could not tolerate heat stress. Therefore, it is suggested to use SCU with a longer release time to provide nitrogen until the wheat reaches the harvesting stage. In this way, wheat growers, especially farmers in developing countries, can use sustainable ecosystem practices in the salt-affected soils. There is a need to conduct studies on SCU with a release period of ~180 days, particularly in heat stress conditions. Another future recommendation for the study is to analyze the nitrogen losses and ecosystem benefits while using slow-release SCU instead of common nitrogen fertilizers. Future research studies, such as modeling ecosystem services and N loss under various crop and climate change scenarios, may also indicate the agricultural system's sustainability.

**Supplementary Materials:** The following are available online at https://www.mdpi.com/article/10 .3390/agronomy11112340/s1, Figure S1. Setups for the waterlogging stress (a), control/salt stress (b), and heat stress (c) experiments. Figure S2. Schematic representation of the experimental design. Figure S3. Time bar graph of the whole study. Table S1. Photosynthetic attributes of the wheat plant. Table S2. Properties of the soil used in the study.

**Author Contributions:** Conceptualization, formal analysis, investigation, methodology, software, validation, visualization, writing—original draft, A.A.; conceptualization, funding acquisition, methodology, project administration, supervision, writing—review and editing, X.Z. (Xinkai Zhu); conceptualization, methodology, resources, supervision, writing—review and editing, M.Z.; investigation, M.Q.; formal analysis, writing—review and editing, S.I.; investigation, D.X.; formal analysis, writing—review and editing, M.A.; writing—review and editing, X.Z. (Xinbo Zhang); writing review and editing, S.G.; writing—review and editing, F.L.; writing—review and editing, A.Z.S.; writing—review and editing, A.Z. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was jointly supported by the earmarked fund for Jiangsu Agricultural Industry Technology System (JATS[2021]503), the National Key Research and Development Program of China (2018YFD0200500), the National Natural Science Foundation of China (31901433, 31771711), Jiangsu Modern Agricultural (Wheat) Industry Technology System, Pilot Projects of the Central Cooperative Extension Program for Major Agricultural Technologies, The Priority Academic Program Development of Jiangsu Higher Education Institutions, and The Science and Technology Innovation Team of Yangzhou University, Yangzhou, China.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
