Soybean plants have the ability to form a symbiotic relationship with nitrogen-fixing Rhizobia bacteria, which cause the small swellings on the root system called nodules. The soybean plants are developing rapidly and nodules will start to form shortly after plant emergence. If the plant is around 6 inches tall with the first or second true leaves (trifoliolate leaves) unfolded, nodules will start to actively fix Nitrogen (N) gas into plant available N. The number of nodules will increase until the R5 (the beginning of the seed formation) stage or slightly beyond. In Figure 1, the average number of soybean [...]
The Illinois Soybean Association (ISA) checkoff and membership programs represent more than 43,000 soybean farmers in Illinois. The checkoff funds market development and utilization efforts while the membership program supports the government relations interests of Illinois soybean farmers at the local, state, and national level, through the Illinois Soybean Growers (ISG). ISA upholds the interests of Illinois soybean producers through promotion, advocacy, and education with the vision of becoming a market leader in sustainable soybean production and profitability.