By assessing the future crop yield early in the season, it is possible to identify areas of the field that lack certain nutrients. Lack of nutrients delays the plants' growth and reduces the potential final yield. Hence, it is very important that the plants have sufficient nutrients available through the growth season. By identifying the location of plants that are not growing at the expected rate, and have a lower Leaf Area Index than expected, the farmer can decide which areas of the field should receive particular attention in terms of the application of fertilizers.