The study was conducted in northern Kazakhstan at a precision farming test site in the Shortandinsky district of the Akmola region. It evaluated the effects of foliar treatments with the polymer fertilizer Vitanoll-NP and the humic preparation Stimulife on spring wheat yield, crop structure, and nutrient accumulation under drought conditions. Plant growth and development were assessed using ground-based observations and Earth remote sensing data obtained from Sentinel-2 imagery and unmanned aerial vehicles. The response of wheat plants varied depending on fertilizer type and application timing. Stimulife increased biological yield by 7.3–10.2%, whereas Vitanoll-NP produced increases of 12.1–18.0%, with the combined treatment showing the greatest effect. Foliar treatments also altered plant density, height, productive tillering, grain number per ear, and 1,000-grain weight. Chemical analysis indicated a tendency toward increased potassium accumulation in the grain, while nitrogen and phosphorus contents did not increase. The results revealed hidden effects of spring wheat productivity management associated with variation in the attraction effect, namely the redistribution of assimilates and mineral nutrients from vegetative organs to the ear. This variability should be considered when selecting foliar fertilization strategies for spring wheat under water-limited conditions.
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