This method typically has the soil samples collected a year (or more) after the imagery date and tissue testing. Site-specific soil test target levels are established for each field and nutrient management plans developed to reach and maintain the target levels. Plant tissue analysis gives a much more direct measure of what the plant is using; the procedures are universally applicable (in contrast to soil testing methodology); and regular plant tissue testing enables plant nutrient status to be monitored. Precision fertilization is applying the Right Input, at the Right Amount, to the Right Place, at the Right Time, and in the Right Manner and help farmers reduce the amount of inputs they use, which can help reduce the risk of environmental pollution. Precision agriculture is the science of improving crop yields and assisting management decisions using high technology sensor and analysis tools. Precision fertilization and precision irrigation are a fertilization technology based on the comprehensive analysis of the yield data of different spatial units and multilayer data, such as soil physical and chemical properties, diseases, pests, and climate. A fertilizer recommendation is the research-based set of guidelines, or management practices, for supplying fertilizer to the crop to achieve yield and quality goals (economic) in a manner that minimizes nutrient losses to the environment. High-spatial-resolution UAS imagery enables much earlier and more cost-effective detection, diagnosis, and corrective action of agricultural management problems compared to low-resolution satellite imagery. Therefore, UAS can address the needs of farmers or other users, enabling them to make better management decisions with minimal costs and environmental impact.

Use the soil analysis to establish the general sol properties and what may need to be adjusted. Those properties need only be retested every 5 years. Use the foliar analysis and associated sufficiency levels to adjust the fertiliser inputs. Remember that problems at the root level will cause a disjunct between what you expect from the soil analysis and what you measure in the foliage. As a rough guide to inputs calculate the removals in the crop