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Soybean Progress (08/02/18)

The soybean crop has developed rapidly during the summer of 2018.

Soybean Progress

The soybean crop has developed rapidly during the summer of 2018. If a 0.9 maturity group soybean was planted on May 20 near Fargo, the accumulated growing degree-days (GGD) on July 30 were 1481 GDD compared with the 1274 normal accumulated GDD for the same date. At this time, there are about 16 percent more accumulated heat units compared to the long-term average. Heat units push the soybean plant towards maturity. The soybean maturity application called ‘soybean growing degree days’ at the North Dakota Agricultural Weather Network (https://ndawn.ndsu.nodak.edu/soybean-growing-degree-days.html) predicts a 0.9 maturity variety, mentioned above, to be physiological mature on August 26. Physiological mature means that 95% of the soybean pods will have the mature color. It will take 10 to 14 days to further dry down the grain before it can be harvested. The predicted date of physiological maturity will change slightly depending on the temperatures from today until maturity. If we will have below average temperatures, the maturity will be delayed by a few days. To get a prediction graph within the growing degree model, one needs to select the maturity group of the soybean planted, seeding date, and nearest weather station. The soybean growing degree model also indicates the normal first frost date for the selected weather station.

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Hans Kandel

Extension Agronomist Broadleaf Crops

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