Kurt Turner and Lane Bothwell from Ag Genesis share their innovative "gridding the zone" approach that combines traditional zone mapping with targeted grid sampling to address pH variability in eastern South Dakota fields. They've discovered that their most productive field zones often hide significant pH problems that can be economically addressed through this hybrid sampling method.

• Field topography in Eastern South Dakota creates extreme yield variability (corn yields ranging 100-240 bushels per acre)
• Traditional zone sampling works well for most nutrient management in their variable landscape
• Low pH problems tend cluster in high-productivity zones, not poor-performing areas as might be expected (this is not always the case, check your soil test results!)
• Selective grid sampling within problematic zones can reduce sampling points by 60-70% compared to whole-field gridding
• Lime application becomes more economical when precisely targeted to actual problem areas
• Cost savings benefit both the service provider (fewer samples to collect) and the farmer (less lime needed)
• Limited lime sources in the Dakotas make efficient application especially important
• pH improvements are visible within 2-4 years of targeted lime application

If you're interested in learning more about Ag Genesis, check out our previous episode where we dive deeper into their business model and precision ag philosophy.