Satellite images offers tools for improving nitrogen use efficiency and reduce environmental impact. By using satellite-derived vegetation indices, farmers can monitor crop vigor and detect nitrogen deficiencies, especially during key growth stages like V6-V8 and pre-tasseling. Combined with weather forecasts and soil data, satellite insights help farmers fine-tune timing and dosage. Instead of applying a uniform nitrogen dose across an entire field, satellite biomass maps can help identify zones with lower growth or chlorophyll content. These areas may require additional nitrogen, while well-performing zones may need less. This variable rate application (VRA) approach reduces input costs and minimizes leaching risks. For example, a farmer using satellite imagery notices a drop in NDVI in the northern part of a maize field during the vegetative stage. Ground truthing confirms nitrogen stress. The farmer then adjusts the fertilization plan, applying an extra 30 kg/ha of nitrogen only in the affected zone. This targeted action improves yield in that area without over-fertilizing the rest of the field.