Soybean yield across six planting dates in an irrigated experiment conducted at UNL East Campus at Lincoln, Neb. The first two planting dates (PD) are indicated with arrows.įigure 4. The dashed line indicates the soil temperature (50☏) threshold below which seed chilling injury can occur during the first 48 hours after planting. Air temperature (gray line) and soil temperature (at 2.5-inch depth blue and orange lines) measured in a soybean field planted on Apat UNL East Campus (Lincoln, Neb.). Probability of late spring freeze (minimum temperature equal or below 28☏) at four locations in Nebraska: Smithfield (Gosper County), O'Neill (Holt County), Mead (Saunders County), and Clay Center (Clay County).įigure 2. In addition to increasing light harvest, early planting help maximize the fraction of available soil water used by the crop for transpiration relative to the amount of water that evaporates directly from the soil surface. We want our soybean fields to look “green to the eye” by early July, because this is the calendar time that coincides with R3 stage for late April or early May plantings in Nebraska in most of the years. Early planting will also ensure that pod setting and seed filling occurs under high sunlight levels and that the crop will make use of most of the crop season length to grow, leading to a higher number of nodes and seed number, and a longer seed-filling period. Canopy closure by the time soybean begins to set pods (the R3 stage) should be the “holy grail” for soybean producers. While it is difficult to predict the weather ahead, you have an opportunity to manage your planting date to increase the odds of achieving a higher yield in 2016.Įarly soybean planting helps build a canopy that harvests most of the available sunlight, especially during crop stages that are crucial for yield formation. Weather during the growing season (sunlight, temperature, and rainfall) will ultimately determine the soybean yield potential in a given year. Inoculating Your Soybeans: When, Where, Why?.
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