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Posted 5/22/2022 19:41 (#9671232)
Subject: test

Clark SD

Adjustments for Management and Environmental Factors

Growing Degree Units are based on air temperature and not the soil temperature that impacts emergence. For this reason, several research reports document specific situations where adjustments may be made to help you fine tune expected emergence dates (Table 1) based on GDUs determined from air temperatures.

Table 1. Potential impact of various management and environments that may alter corn emergence rates. (Source: Adapted from Corn Development, University of Wisconsin)
Management/ EnvironmentSpecificsGDU AdjustmentSources
Residue% In-row Residue Cover5 to 50 GDUSwan et al., 1987
Soil textureFineAdd 30-60 GDU 
CoarseSubtract 30-60 GDU
Planting dateBefore AprilAdd 10-25 GDU 
After May 15Subtract 50-70 GDU
Seed-zone soil moistureBelow optimumAdd 30 GDUSchneider and Gupta, 1985
Seed-bed conditionSoil crusting or massive clodsAdd 30 GDUSchneider and Gupta, 1985
Seeding depthFor each inch below 2 inches ...Add 15 GDUHunter and Kannenberg, 1972
Severe drought or heat stressCorn will not germinate until it absorbs 30% to 35% of its weight in water. Abendroth et al, 2011.
Seed treatmentsInsecticides and fungicidesThese may improve emergence percentage and perhaps emergence uniformity. If they improve plant to plant uniformity, they may hasten overall emergence in conditions listed elsewhere in this table.
HybridHybrids with better emergence scores may emerge fasterVariable 
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  • test - Mikenesd : 5/22/2022 19:41

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