1. A method for determining a crop yield loss due to nitrogen deficiency in at least one or more crop fields based on an analysis of at least one or more remote sensing images, the method comprising: a. obtaining a remote sensing image of the one or more crop fields; b. assigning spatial coordinates to the at least one or more remote sensing images, represented by pixels or polygons comprised of aggregated pixels, from the at least one or more remote sensing images; c. establishing a reference value of green for the at least one or more remote sensing images; d. calculating a relative green value of each pixel in the at least one or more remote sensing images by dividing a green value of each pixel by the reference value of green; e. estimating a yield loss (YL) of each pixel by substituting the relative green value (RG) of each pixel into the formula YL=C 1 ×RG−C 2 , wherein C 1 and C 2 are empirically derived constants; and, f. constructing a yield loss map from a spatially referenced yield loss of each pixel; wherein the yield loss comprises a decrease in crop yield per acre of a crop.