The pertinent study assessed the different photosynthetic activity parameters in spring soft wheat (Triticum aestivum L.) genotypes based on diverse mineral nutrition levels. The dynamics of leaf area growth, photosynthetic potential, and net crop productivity at various developmental stages reached analysis. The determined average correlation between yield and flag leaf area for three research backgrounds showed that not all wheat genotypes responded equally to the mineral fertilizer due to their varied biological characteristics and genetic backgrounds. It was also evident that enhancement in leaf area and photosynthetic parameters appeared in wheat genotypes when applied with complete fertilizer doses. For instance, the following rates emerged for the maximum flag leaf area (12 300 m²/ha), the total leaf area (17 700 m²/ha), photosynthetic potential (0.960 million m²/day), and the net photosynthesis productivity (6.7 g/m² per day), with the average grain yield on this background was 3.3 t/ha. The increase in the number of nodal roots of spring soft wheat genotypes mainly responded to the different mineral nutrition levels. In the context of a 0.5 calculated dose of mineral fertilizer, seven out of nine wheat lines had 22% more nodal roots, and the utmost calculated dose of mineral fertilizer was 24% more than the control treatment (unfertilized background), which was crucial for increasing the productivity considerably.

Keywords: Spring soft wheat (Triticum aestivum L.), mineral fertilizers, photosynthesis, leaf area, photosynthetic potential and productivity, grain yield, nodal roots

Key findings: The results showed that based on the levels of mineral nutrition of spring wheat genotypes on the leaves‟ photosynthetic activity, root system development, and productivity, the genotypes differed in their reaction to the mineral fertilizers due to their varied biological characteristics and genetic makeup. The results also revealed that the considerable enhancement of leaf area and photosynthetic parameters in spring wheat genotypes surfaced when applied with the highest dose of mineral fertilizers.