Research by Purdue University agronomy professor Sean Casteel shows that soybean yields can be increased under certain conditions by applying before the initial sulfur application or immediately after planting.
For the season debut, sharp edgesMyzex agronomist Henry Prinzen is taking that knowledge into the field, comparing notes with Simcoe, Ont., grower Kyle Soden, who participated in an on-farm sulfur test in 2023.
Last year, Myzex conducted trials on five farms across Ontario and Quebec and found significant yield responses to 100 pounds of ammonium sulfate (20 pounds of actual sulfur) at three sites, including Soden’s farm. It was seen. For treatments that also included fungicide and nitrogen addition, yield increases increased up to 12 bushels.
In his video, Prinzen examines why some sites were more responsive than others. “For highly responsive sites, we’re looking at soils with low CEC (cation exchange capacity). Probably sand, but not necessarily sand. How many medium-textured soils have responded? But for really heavy clay and heavy loam, we didn’t find anything this year. (Story continues after video.)
Prinzen also explains how tissue testing at the R3 stage can determine nitrogen and sulfur concentrations, and how those measurements can determine whether adding sulfur can increase yield. It also explains. Casteel’s research shows that if the nitrogen to sulfur ratio exceeds his 18:1, more sulfur is needed. However, if the ratio is less than 18:1, adding sulfur may not contribute to yield. And that’s exactly how it played out on his Maizex exam, Pinzen says. “Sites that responded were above that ratio, while sites that did not respond were below that ratio.”
Prinzen said 2024 will be a great opportunity for producers to conduct on-farm testing and tissue testing to see how soybeans react to sulfur on the farm.
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