Current Soybean Seed Conditions - June 7, 2010
[Title Slide – Current Soybean Conditions. Your Arkansas Soybean Podcast, University of Arkansas Division of Agriculture, Arkansas Soybean Promotion Board. Number 33 - June 7, 2010]
[Narrator] [Pictures of a soybean fields] According to Dr. Rick Cartwright with the University of Arkansas Division of Agriculture, planting soybean in June makes getting a stand more of a challenge.
[Picture of a seed storage facility with pallets of seed bags] Seed has now been stored since harvest [pictures of soybean seed sprouts] and our studies have shown that vigor of soybean seed decreases as we get closer to June planting time.
It is critical to understand the quality of your planting seed in order to have the best chance for a good stand and minimize the risk of replanting.
Soybean seed sold in the U.S. only has to have the germination percentage, shown as "germ," listed on the tag [Picture of seed tag - crop kind soybeans, net weight 50 pounds, pure seed 98%, Inert 1.85%, Other Crop Seed 0.12%, Weed Seed 0.03%, Noxious Weed Seed none; Germination 80%]. This value indicates the number of good seedlings that germinated under optimum temperature and moisture conditions in the lab and is a baseline measurement of seed quality. [Line chart showing effects of storage on seed quality] In our surveys, this value does not change much under Arkansas storage conditions, but sometimes does not correlate well with stand performance under less than ideal planting conditions. [Picture of a soybean field] A value of 80% germ does not mean that 80% of the seeds will come up in the field.
[Picture of soybean seed sprouts] Seed vigor estimates are equally important. [Picture of someone in a lab testing soybean seed sprouts] This is most commonly estimated using the accelerated aging test where seed is stressed for three days at a higher temperature and humidity, and the germ is tested. [Picture of clear plastic boxes with soybean seed sprouts] An AA value of 65% or above is acceptable seed vigor, but the higher the better, when planting in June. [Scatter chart showing 2009 Vigor AA %] This value decreases over time, so obtain an AA test as close to planting as is practical. [Picture of soybean seed sprouts] While all companies use an AA test, the results aren't required on the bag. [Title slide Accelerated Aging Results - Ask for AA results, have tested yourself] You can ask for this information or have seed tested yourself. [Title slide Accelerated Aging Results - fee based testing available at the Arkansas State Plant Board] Testing is available through the Arkansas State Plant Board in Little Rock for a fee.
[Title slide Accelerated Aging Results - Regional, Websites, shipping paperwork to dealers] Regional seed companies tend to provide AA test results on their websites - you will need the lot number - or with the shipping paperwork to their dealers. [Title slide Accelerated Aging Results - Multi-national, ask representatives, test yourself] For seed from multinational companies, you may have to ask their local representatives to find this information or have seed tested yourself.
[Picture of soybean seeds] Seed quality from the 2009 growing season that is being planted now has been in reasonably good shape. [Picture of soybean seeds showing three different conditions] However, last year was very wet during the time when seed matured and was later harvested. We are unsure how well the quality in storage will hold up. [Pictures of seeds in a petri dish being tested for fungi] The seed industry noted a high level of seed fungi during testing and we are strongly recommending that a broad spectrum seed treatment fungicide be considered on soybean seed planted this year.
[Narrator] Your Arkansas Soybean Podcast is a production of the University of Arkansas Division of Agriculture and was funded in part by the Arkansas Soybean Promotion Board. For more information on soybean farming in Arkansas contact your local county Extension Office.
[Title slide - For more information contact your local county Extension office. Your Arkansas Soybean Podcast, University of Arkansas Division of Agriculture, Arkansas Soybean Promotion Board]