Note on Early Fall Soil Sampling
August 29, 2007
There is no reason to delay soil sampling following small grain harvest, notes NDSU extension soils specialist Dave Franzen. Due to the low N content of the residue, the chances of large N releases either from the residue or the soil following harvest is low. Early sampling after small grain harvest increases the accuracy and consistency of the 0-6 inch soil core, and allows the grower to have time to plan an N rate if fall N application is planned. However, delaying soil sampling after other crops, including canola, field peas, and dry edible beans, is recommended until the soil cools, usually late September. This is recommended because some soil organic matter/residue mineralization may take place between harvest and sampling.