Ultra Late Soybeans after Corn
Posted by romeethredge on June 30, 2012
Ultra late planted irrigated soybeans (after July 20) do best in drilled rows of 7.5 inches at about 170,000 to 200,000 plants per acre ( minimum of 49 to 58 pounds @ 3500 seed per pound, if you get them all up, more for larger seeds and poor conditions). Successful farmers usually use a no-till grain drill just after corn harvest. If weeds are present , spray them just after corn harvest or just after planting. A preemergence residual herbicide may be used as well if needed. Farmer Raymond Thompson says to just leave the corn stalks as this will help at harvest time to get the bean plants into the combine and this saves a lot of work, expense and time, compared to disking and burning. I’ve seen them have the drill planting beans in the same field with the corn combine still there getting the corn out. Time is of the essence.
Here’s a link to a planting video I took last year.
Here’s a link to my slideshow concerning Ultra late soybeans. Just click on the photo.
The quicker you get them growing the better. Planted in corn stubble you will need to use 30-50 pounds of N to get these beans as tall as possible. The photo of the drill running is from last year. We often pump the nitrogen through the irrigation system. Always plant into wet dirt, try not to plant and water up as this can form a crust, but under certain conditions you may have to water them before they crack the ground. Water after soybeans have cracked through for best results. All season irrigation is necessary for good results.
Certified Cobb variety soybeans is your best tried and true choice. It’s not Roundup Ready however so put your herbicides out quick as these beans will grow very fast. Other varieties have been used and may work well, especially before the end of July. Also watching for and treating for insects and diseases is critical. Seminole County farmers have often made 35 bu/acre and finished planting as late as the second week in August, but the later you get, the lower the yield and the riskier it is. In some years the yields are low when we have an early fall. Farmers say they like double cropping the soybeans behind corn for another reason, it keeps late season weeds down in the fields.
Jimmy Clements of Plantation Seed, Raymond Thompson, Mims Farms, Jared Whittaker and Eric Prostko contributed to this article.