First hollow stem update 02/19/2016

First hollow stem is the optimal time to remove cattle from wheat pasture (full explanation). We measure first hollow in our September-sown wheat forage plots at Stillwater each year, and normally have approximately 50% of varieties at or past first hollow stem by March 1st. I have posted first hollow stem measurements from these plots in a table at the end of this blog. No varieties are currently at first hollow stem at Stillwater, but given the warm conditions and the estimates from the first hollow stem advisor on the Mesonet, I anticipate we will have some varieties past first hollow stem by next week. Note that while no varieties are currently at first hollow stem, the overall average first hollow stem measurement increased as compared to 02/16/15.  Dillon Butchee reported early sown Gallagher in the Altus area was at first hollow stem.

Keep in mind that the numbers reported from Stillwater are likely behind those being observed in southern Oklahoma and ahead of those observed in northern Oklahoma. The First Hollow Stem Advisor on the Oklahoma Mesonet indicates that  early varieties in southern Oklahoma are likely past first hollow stem and that early varieties in central Oklahoma will reach this point within a week. Jim Johnson with the Noble Foundation reported that the estimates on the first hollow stem advisor were matching closely with his observations in the field around the Ardmore area. My advice is to start looking for a home for cattle on wheat pasture.



First hollow stem measured in wheat sown 09/15/2015 at Stillwater, OK.
Variety cm of hollow stem 02/19/16
Endurance 0.6
OK Rising 0.5
Billings 1.3
Ruby Lee 1.2
Duster 1.1
Gallagher 1.4
Iba 1.1
Bentley 0.7
Doublestop CL Plus 0.6
NF 101 1.1
WB-Cedar 0.7
WB4458 0.8
WB-Grainfield 1.0
Winterhawk 0.9
WB4455 0.6
WB4721 1.3
WB4303 1.2
SY Monument 0.6
SY Flint 1.3
SY Llano 1.0
SY Drifter 0.8
SY Wolf 0.4
SY Razor 1.4
SY Grit 1.3
Everest 0.6
1863 0.9
KanMark 0.7
Oakley CL 0.7
Larry 0.4
Zenda 1.1
Tatanka 0.4
Joe 0.6
LCS Pistol 0.6
LCS Wizard 0.6
LCS Mint 0.7
LCS Chrome 0.6
T158 0.7
Long Branch 0.9
TAM 112 0.7
TAM 204 0.6
TAM 114 0.4
AG Robust 0.7
Byrd 0.6
Brawl CL Plus 0.5
Avery 0.4
OK1059060-3 0.5
OK10126 0.3
OK11D25056 0.5
OK12621 0.4
OK10728W 0.6
OK12716R/W 0.4
OK11231 0.4
OK09915C-1 0.4
OK12912C 0.7
OK12DP22002-042 0.8
OK118036R/W 1.1
Average 0.7


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