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K-State Agronomy eUpdates

Department of Agronomy

Kansas State University

1712 Claflin Rd.

2004 Throckmorton PSC

Manhatan, KS 66506

785-532-6101

agronomy@ksu.edu

Extension Agronomy

First hollow stem update: Week of February 25, 2018

 

Cattle should be removed from wheat pastures when the crop reaches first hollow stem (FHS). Grazing past this stage can severely affect wheat yields (for a full explanation, please refer to eUpdate article “Optimal time to remove cattle from wheat pastures: First hollow stem” in the Feb. 23, 2018 issue).

First hollow stem update

In order to screen for FHS during this important time in the growing season, the K-State Extension Wheat and Forages crew measures FHS on a weekly basis in 28 different wheat varieties that are commonly grown in Kansas. The varieties are in a September-sown replicated trial at the South Central Experiment Field near Hutchinson.

Ten stems are split open per variety per replication (Figure 1), for a total of 40 stems monitored per variety. The average length of hollow stem is reported for each of the varieties in Table 1. As of February 21st and 28th, none of the varieties had yet reached first hollow stem but all varieties had started to elongate the stem.
 

https://webapp.agron.ksu.edu/agr_social/lib/Filemanager/userfiles/02222017/eUpdate02222017-A02-F01.gif

Figure 1. Ten main wheat stems were split open per replication per variety to estimate first hollow stem for this report, for a total of 40 stems split per variety. Photo by Romulo Lollato, K-State Research and Extension.

 


Table 1. Length of hollow stem measured Feb. 21 and Feb. 28, 2018, of 28 wheat varieties sown mid-September 2017 at the South Central Experiment Field near Hutchinson. The critical FHS length for purposes of cattle removal is 1.5 cm (about a half-inch or the diameter of a dime).

Variety

2/21/2018

2/28/2018

 

Hollow stem length

(cm)

AM Eastwood

0.19

0.28

NE10478-1

0.15

0.25

LCH13-22

0.16

0.21

LCH14-55*

0.17

0.19

LCH14-89

0.15

0.22

LCS Chrome

0.16

0.20

LCS Pistol

0.17

0.22

Bentley

0.12

0.22

Doublestop CL Plus

0.15

0.21

Gallagher

0.18

0.26

Iba

0.16

0.20

Lonerider

0.15

0.21

OK12716

0.15

0.21

Ruby Lee

0.13

0.19

Smith's Gold

0.18

0.27

Spirit Rider

0.19

0.24

Stardust

0.18

0.23

Paradise

0.19

0.23

Bob Dole

0.19

0.25

SY Achieve CL2

0.18

0.26

SY Benefit

0.18

0.26

SY Rugged

0.13

0.23

1863

0.21

0.24

Joe

0.16

0.21

Larry

0.15

0.22

Oakley CL

0.14

0.21

Tatanka

0.12

0.22

Zenda

0.19

0.23

Differences among varieties

No

Yes

LSD

-

0.04

 

While none of the varieties had yet reached FHS as of February 28, there were statistical differences among the varieties evaluated and these differences tend to increase over time. Thus, we will report FHS again during March 5-9. Additionally, FHS is generally achieved within a few days from when the stem starts to elongate, so we advise producers to closely monitor their wheat pastures at this time.

The intention of this report is to provide producers an update on the progress of FHS development in different wheat varieties. Producers should use this information as a guide, but it is extremely important to monitor FHS from an ungrazed portion for each individual wheat pasture to make the decision of removing cattle from wheat pastures.

 

 

 

For questions please contact Dr. Lollato:

Romulo Lollato, Wheat and Forages Specialist
lollato@ksu.edu

Co-authors:

Larissa Bonassi, Visiting Assistant Scientist

Felipe Spolidorio, Visiting Assistant Scientist

Jose Guilherme Cesario Pereira Pinto, Visiting Assistant Scientist

Gustavo Bacco, Visiting Assistant Scientist

Edwin Navia, Visiting Assistant Scientist