|By Source: University of Minnesota Extension|
|Penton Business Media|
For many growers, this unusually early spring may offer the earliest opportunity of all time for corn planting. This makes it especially important to weigh the risks and benefits of early planting.
For farmers with Federal crop insurance, planting before the earliest allowable planting dates specified by the
Minnesota in 2010. Although the growing point on corn is below the soil surface until the five leaf collar stage (V5), new growth often has trouble emerging through frost-damaged tissue, resulting in buggy-whipped plants. Frost damage to plants that are 6 in. or shorter can reduce yield by 9-15% (Bremer et al., 1995), and is likely related to the subsequent unevenness in the stand and completion among plants. For example, previous research from
Corn that is emerging (spiking) is less affected by a freeze than corn at later growth stages (V1 or later). Since corn requires about 155 growing degree days to reach the V1 stage, one can assess the risk of frost damage by using expected air temperatures to calculate growing degree days and project the date at which corn would reach the V1 stage for a given planting date, and then compare that to historical frost-free dates. For most regions in
Useful web links for assessing the risk of frost damage:
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