Iowa State University Extension and Outreach Field Agronomists have completed their fall survey of subsoil moisture in northwest Iowa. Subsoil moisture sampling in Iowa dates back to February 1954 when ten sites were chosen for soil moisture sampling. In 1959, the sampling increased to 22 locations, and in 1971, 61 locations were sampled. Today, 18 locations are sampled in northwest Iowa.

Soil testing is an essential tool for managing phosphorus (P), potassium (K) and other nutrients. In Iowa and many states, the units reported in a soil test are expressed in parts per million (ppm) of the elements (not oxides P₂O₅ or K₂O, as in fertilizers) of dry or moist soil depending on the test. Different test methods can be used for a specific nutrient.

As harvest wraps up, grain producers are reminded to actively monitor and manage stored grain. The following articles and resources are available: 

Practical Considerations when Reconditioning Overly Dry Soybeans

Time to Cool and Core Storage Bins

Iowa Grain Quality Initiative Training Modules 

Join us for the 36^th Integrated Crop Management Conference, which brings together a range of topics related to crop production, crop protection, nutrient management, and soil and water management. The event features experts sharing research updates and practical recommendations. Don’t miss this key opportunity for networking and education!

When: December 10 and 11, 2025

Where: The Meadows Events Center in Altoona, Iowa

While harvest is slowing down across the state, many have noticed new plant growth in the field: volunteer corn. While volunteer plants aren't unusual, it is rare to see so many fields with substantial unwanted plants this fall. Let’s examine why and what it might mean for 2026.