This condition has been referred to as summer slump, fescue toxicity. For more information on sampling and cost, please contact the Lee County Extension Service. Nitrogen for Soybeans Gene Stevens, Commercial Agriculture Sales Specialist at the University of Missouri has been conducting research on the application of nitrogen fertilizer to soybeans. Though still in the research phase the results are of interest and may deserve a look. For the past four years, Stevens has applied various rates of nitrogen to soybeans through a lateral-move irrigation sprinkler at different stages of the crop's growth.
Timing seems to be the key.
Best yield results occurred when 20 pounds of N were applied at the beginning of seed formation. Research continues on the project. So far the number of potato leafhoppers I have seen have been few. We will continue to monitor weather. Most leafhoppers arrive in the county on systems that arise in the Gulf of Mexico.