By: Dan Kaiser, Extension soil fertility specialist Prevented planting situations in parts of Minnesota have led to some questions about potential changes to fertilizer applications. Crediting fertilizer applied prior to the 2019 crop in prevented planting situations depends on the nutrients. Mobile nutrients such as nitrate and sulfate which were applied fall 2018 may not be there and may have been used by weeds or cover crops growing in fields this summer. If some carryover of nitrate is expected, a two-foot soil sample can be used to determine if any nitrogen should be credited. Nitrate can build in situations where a field is fallowed and no crop is grown due to mineralization of organic matter over the growing season. Crediting of phosphorus and potassium applied in fall 2018 can be done in prevented planting situations as long as plant material was not removed from the field. Phosphorus and potassium are held in soils and will be available for the following crop. If ph