KDD - 5/5/2024 02:23 Yield maps form the basis of almost every material application we perform…seed, fertilizer, and lime. Yield data is collected almost by the foot, at least every few seconds as the combine travels. Soil nutrient samples are taken mostly on a 2.5 acre square grid. Also used in the VR prescription formulae are soil type maps, and some proprietary factors from Pioneer seeds. Lime is the first variable application we did, because some grids needed quite a lot, some none, to get pH in balance across the field. Fertilizer gets a higher rate on better yielding grids, because that is where the most removal come from (the best yields). seed depends…the best yielding blocks get a higher seeding rate for corn, but often the opposite for soybeans…the poorer yielding areas need more population for optimal bean yields, and the best yielding areas need fewer beans, so they don’t get too tall and fall over. You are not going to make the poorer areas better by trying to apply more inputs, although we have seen some improvement in uniformity using our methods. You have to supply more nutrients where the best yields are coming from.