Slow growing degree day accumulation – 2013

63 Percent of average last week

Not only does corn planting progress lag behind that of most other recent years (see figure 1 in my June 7th blog), that planted suffers from various problems. Included in this list are seedling diseases such as Pythium and anthracnose leaf blight. Stands are compromised across the state because of saturated soils as well as ponding and flooding. In addition to all of this, plant colors range from greenish yellow to yellow (see Sawyer’s 2011 ICM News). As Mark Licht (@marklicht) tweeted this morning, “…that’s what cool wet weather does for nutrient uptake in corn…[the] Rx is warm dry weather.”

An additional problem faced by the 2013 corn crop is slow Growing Degree Day (GDD) accumulation. Not only do our GDD accumulations from April 1st fall below normal – 83% statewide – the trend continues. State-wide average GDD accumulations from May 1st are 87% of average and that of the last seven days (June 3rd to 9th) is only 63% of normal. The NC and NE cropping districts lag behind in GDD’s compared to the rest of the state’s Crop Reporting Districts (CRD). For example, last week’s accumulations in those two CRD’s were about 55% of normal.

Figure 1 (adapted from Mesonet data) compares GDD accumulations as a percent of normal for each of the CRD’s and the state average for the periods May 1st to June 9th and for the last week, June 3rd to 9th. The 2013 corn crop needs warm dry weather!

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