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ISSUE 5  JUNE 3, 1999

 

SOYBEAN CAN EMERGE QUICKER AND COMPENSATE BETTER THAN CORN

    Soybean seed can begin germinating when the seed has absorbed enough water to equate to
about 50% of the dry seed weight. So under adequate soil and air temperatures and moisture regimes,
soybean can germinate in less than half a day. Emergence from soil depths may take an additional two
to three days, depending on adequate growth conditions. Like corn, soybean yield is affected by
temperature or moisture stress, especially if it occurs during flowering and pod fill. However, unlike corn,
soybeans produce excess flowers on the plants. Usually only 25-40% of a plant's flowers develop into
mature pods with the remaining 60 to 75% of the flowers or pods aborting and never contributing to
yield. Day-length also affects most soybean varieties grown in North Dakota and Minnesota so that
late-planted soybeans may hasten their development toward maturity with less yield loss than other
late-planted crops.

Denise McWilliams
Crop Production Specialist
dmcwilli@ndsuext.nodak.edu

 


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