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Northeast Louisiana | Soybeans really don't flower in relation to heat units like some crops do. They are flower in response to daylight. They can dry down and mature a little quicker in hot, dry conditions than in cooler conditions, though, which makes it difficult to put a day number maturity on them like corn. As said above, planting dates have some effect too.
These variances make it difficult for a seed company to nail down an exact sub-maturing group, like 4.7 or 4.9. When I was selling seed, I always used to just say late 4, because a 4.7 won't always mature before a 4.9, they'll be pretty close to the same.
Sometimes a variety is intentionally mis-labled because a company needs it to fit in a certain group. Here in the south, some varities labeled 4.9 are actually early indeterminate Group 5's. But a 4.9 is going to sell a lot better than a 5.1, because the farmer wants a group 4. Not saying it's right, but that's sometimes what happens.
Edited by Deadduck 9/23/2007 23:28
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Splain me a little something about soybeans.
