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Scientific forage management needs accurate measurement of Normalized Difference Vegetation Index (herein after NDVI). By comparing a time series of NDVI images are valuable for forage management. The authors have developed a methodology that possibly reduces the amount of fertilizer applied thus protecting the environment. This methodology uses an unmanned aerial vehicles (herein after UAVs) and Satellites. Comparing different periods of Satellite derived NDVI, the authors propose a methodology to quickly understand forage growing conditions and leads to economical fertilizer application rates. The possibilities of combining multispectral images and Satellite images are also discussed.