By Andi Anderson
With harvest season wrapping up, fall is the perfect time to collect soil samples to assess the presence of soybean cyst nematode (SCN) in fields.
Testing for SCN can reveal important information that helps improve soybean yields in future growing seasons. Farmers can make better-informed decisions about pest management and understand last season’s yields by gathering these samples.
Collecting soil samples for SCN in fields where soybeans were grown in 2024 can help explain yields from the past season, while testing corn fields planned for soybeans in 2025 shows SCN levels and aids in determining pest control strategies.
Sampling soil for SCN is straightforward and effective. The recommended steps include:
- Use a Soil Probe: Collecting soil samples with a soil probe, rather than a spade, yields the most accurate results.
- Sampling Process: Gather 15 to 20 soil cores, each about 8 inches deep, from every 20 acres.
- Precision Matters: The more soil cores collected, and the smaller the area sampled, the more reliable the data.
- Grouping Cores: Group soil cores from similar areas in the field, known as management zones, which share agronomic characteristics. Mix the soil cores well in a bucket, then place the sample in a labeled bag.
- Storage: SCN soil samples can be stored at room temperature without refrigeration.
These samples can be mailed or delivered to specialized facilities for analysis. For instance, the ISU Plant and Insect Diagnostic Clinic in Ames, Iowa, provides testing services. Private soil-testing labs can also process SCN samples, offering additional options for farmers.
Fall soil sampling for SCN is an easy yet effective way to gain insights into nematode presence. This simple practice allows farmers to take control of SCN management, improve yields, and make informed choices for the upcoming planting season.
Photo Credit: gettyimages-sasiistock
Categories: Iowa, Crops, Soybeans, Rural Lifestyle