Missouri Soybean Crop Growth Slowed by Rainfall in 2026

By Blake Jackson

The University of Missouri Extension has published its 2026 Soybean Growth Monitoring biweekly report, offering farmers updated insights into crop development across the state.

Now in its third year, the report is released every two weeks to track the condition and progress of Missouri’s soybean crop.

The monitoring system relies on crop growth models that simulate soybean development and expected yield across various regions. It incorporates both current and historical weather data and is validated through the Soybean Farming Systems field research network.

According to MU Extension soybean farming systems specialist Andre Reis, the report helps producers better understand how environmental conditions are influencing crop growth and potential yield outcomes during the season.

“These forecasts support in-season decision-making by providing timely insights into crop performance,” said Reis.

The first report of the 2026 season highlights biomass accumulation as an indicator of crop growth. Future updates will include yield projections as the season progresses.

Field conditions across Missouri have been impacted by heavy and uneven rainfall, which has slowed soybean planting. USDA’s National Agricultural Statistics Service reports that 20% of the state’s soybean crop remains unplanted, slightly higher than the 18% recorded at the same time last year.

“Early-season wetness continues to create challenges for soybean emergence, stand establishment and vegetative development,” said Reis.

While recent warm weather may support crop recovery, additional rainfall could continue to restrict field access. Excess moisture may also affect nodulation and early nitrogen fixation, making it important for farmers to monitor plant health closely.

Reis advises growers to carefully evaluate replanting decisions and consider potential yield losses from delayed planting.

“Soybean vegetative growth appears to be lagging in many regions of the state,” Reis said. “We expect vegetative growth to recover between now and the onset of seed filling.”

For additional details, growers may contact Andre Reis at 573-882-4771 or areis@missouri.edu.

Photo Credit: gettyimages-zoran-zeremski