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| I have been planting a pioneer number 0404. It is a 104 day corn. I also seed some 4375 dekalb. The 0404 for me seems to be a nice hybrid so far. I have had it 2 years one was a 21 inch rain year and this year is a 14 inch rain year. My question is when you look at the the GDUs to physical maturity it says 2450. Does that mean black layer? My dekalb 4375 is 2325. What i am wondering is does pioneer use a different rating scale? These 2 hybrids seem to be awfully close in GDUs to maturity since one is a 93 day and the other is a 104 day. I have been chopping the 104 day but thinking about planting it to combine since it is so close in maturity to the 93 day. |
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Central Nebraska | Pioneer does not start counting GDUs until emergence while Bayer starts counting at planting date. A 104 day Pioneer will act like a 107 or 108 day Bayer number. |
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South Dakota | 0404 in my experience acts like a 102 day corn. Definitely not a 107 day. |
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NW Wisconsin | X2 Looks good on a long year wet low test weight on a short year. 91-92 days behave like 96 days or longer in my RM. Of course there is variety differences with drydown that can change how a variety feels. |
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central iowa | golfnut - 9/17/2024 07:14
Pioneer does not start counting GDUs until emergence while Bayer starts counting at planting date. A 104 day Pioneer will act like a 107 or 108 day Bayer number.
I was 99% you were wrong, but i confirmed it anyway. Pioneer DOES NOT start counting gdu’s until emergence, they start on planting date. While there is no standard in the industry for stating a hybrid’s maturity since each company rates it based on more than just gdu’s to black layer, hence some may seem earlier than another or later than another, but when using gdu’s to any given stage they should all be similar or certainly within a little bit of each other assuming the company didn’t make a mistake. As always weather does affect some hybrids differently from year to year which could explain some differences seen from year to year.
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| Also don’t some companies account for longer and shorter dry down characteristics when calling a hybrid let’s say a 100 day and 102 day. The 102 might reach black layer at the same GDU's as the 100 day, but it takes longer to dry down to a harvestable moisture for grain. |
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central iowa | Tank2516 - 9/17/2024 11:26
Also don’t some companies account for longer and shorter dry down characteristics when calling a hybrid let’s say a 100 day and 102 day. The 102 might reach black layer at the same GDU's as the 100 day, but it takes longer to dry down to a harvestable moisture for grain.
All the different characteristics is where the subjective nature of hybrid maturities comes into play. Heat units and stages don’t lie (mostly lol), but putting a relative maturity label on a hybrid seems more an art than a science. |
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| I agree. You take the CRM with a grain of salt. |
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NW IL | You can say wrong but that’s what I have heard also.
And some dealers don’t even know. Ask the agronomist.
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central iowa | 9670guy - 9/17/2024 19:53
You can say wrong but that’s what I have heard also.
And some dealers don’t even know. Ask the agronomist.
If this was meant for me:
Read my post, I CONFIFRMED IT WITH MY AGRONOMIST WHO CONFIRMED IT WITH SOMEONE ABOVE HIM, just to be sure before i posted back here. I stand 100% with what i said. What you heard was wrong.
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Minnesota | This is not true, if so P numbers would have less GDU's to maturity by a longshot as it takes about 120 to get a corn hybrid out of the ground. I find Pioneer's GDU's to be dead on in assessments and often use them as a basis of comparison. For example, I've seen 2 hybrids have the same GDU's but Pioneer will call it a 105 day and company B calls it a 101 day but the GDU's to maturity are the same. If everyone would pay attention to GDU's and not RM, you will find you can more accurately place and compare hybrids. In the example I gave above, a person would likely be disappointed with the Pioneer number because it was significantly wetter and doesn't dry down. You could also say the opposite where if you bought company B's and put a 101 day Pioneer side by side with it, you might be disappointed in the dry down of Company B's corn. GDU's to maturity are the best way to know what it takes to get to the finish line, the CRM does take into account drydown, as some hybrids just shed moisture much quicker. |
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Colby, Kansas | My understanding agrees with golfnut. I have asked multiple Pioneer and Brevant contacts over the years as we've been using their products in a number of research studies where we have been evaluating hybrid maturity as a factor. The answer I have consistently received from technical folks across Corteva is that they start counting at emergence.
Obviously, we're not talking to the same people and apparently there isn't uniform understanding within the company.
CRM numbers are generally worthless when comparing across companies (and sometimes within a company).
Allis4ever - 9/17/2024 11:18
golfnut - 9/17/2024 07:14
Pioneer does not start counting GDUs until emergence while Bayer starts counting at planting date. A 104 day Pioneer will act like a 107 or 108 day Bayer number.
I was 99% you were wrong, but i confirmed it anyway. Pioneer DOES NOT start counting gdu’s until emergence, they start on planting date. While there is no standard in the industry for stating a hybrid’s maturity since each company rates it based on more than just gdu’s to black layer, hence some may seem earlier than another or later than another, but when using gdu’s to any given stage they should all be similar or certainly within a little bit of each other assuming the company didn’t make a mistake. As always weather does affect some hybrids differently from year to year which could explain some differences seen from year to year.
Edited by LHaag 9/18/2024 08:21
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| Sure it is. I will admit I explained it wrong though. I was going by what MN law determines RM so if anyone wants a better explanation go google MN law for determining corn hybrids maturity rankings.
Edited by Tank2516 9/18/2024 17:04
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NW IL | lol awesome.
Obviously there are multiple people in the company that just don’t know the answer. |
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Pionner seed GDU rankings?
