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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 (31 March 2022)

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 the eUpdate article “Optimal time to remove cattle from wheat pastures: First hollow stem”).

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 19 different commonly grown wheat varieties 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 variety in Table 1.

 

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 on 9, 15, 21, 24, and  of March 2022 of 19 wheat varieties sown mid-September 2021 at the South Central Experiment Field near Hutchinson. The critical FHS length is 1.5 cm (about a half-inch or the diameter of a dime). Value(s) in bold indicate the highest FHS group. Values highlighted in yellow indicate varieties that have already passed the 1.5 cm first hollow stem threshold.

 

First hollow stem (cm)

Variety

3/9/2022

3/15/2022

3/21/2022

3/24/2022

3/29/2022

AP Exp#1

0.2

0.3

1.0

1.6

 

AP Roadrunner

0.7

1.0

1.9

.

 

AP18AX

0.6

0.6

2.9

.

 

AM Cartwright

0.3

0.5

0.8

1.5

 

Crescent AX

0.4

0.8

2.1

.

 

KS Ahearn

0.3

0.3

0.6

1.2

1.9

KS Hatchett

0.1

0.5

1.0

1.3

2.7

KS13DH0041-25

0.2

0.5

1.2

1.5

 

LCS Atomic AX

0.5

0.6

1.7

.

 

LCS Chrome

0.2

0.5

1.1

1.4

2.7

LCS Helix AX

0.3

0.4

1.1

1.4

2.6

LCS Julep

0.2

0.3

0.8

1.0

1.4

LCS Photon AX

0.4

0.5

1.3

1.7

 

LCS Revere

0.2

0.2

0.5

1.0

1.9

LCS Runner

0.2

0.2

0.8

0.8

1.9

LCS Steel AX

0.3

0.3

1.0

1.4

2.9

LCS Valiant

0.2

0.3

1.1

1.9

 

Plains Gold Ray

0.3

0.4

0.9

1.4

2.0

Zenda

0.5

1.2

2.3

.

 

Average

0.3

0.5

1.3

1.4

2.2

Min.

0.1

0.2

0.5

0.8

1.4

Max

0.7

1.2

2.9

1.9

2.9

 

All varieties except for LCS Julep had elongated more than 1.5 cm first hollow stem as of 29 March 2022. We will report first hollow stem early next weeks until all varieties are past this stage.

The intention of this report is to provide producers an update on the progress of first hollow stem 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 of each individual wheat pasture to make the decision of removing cattle from wheat pastures.

Contact author:

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

Co-authors:

Jorge Romero Soler, Visiting Assistant Scientist

Gaston Olano de Leon, Visiting Undergraduate Assistant

Nicolas Brahian Davila Diaz, Visiting Undergraduate Assistant

Wallas Mendes da Silva, Visiting Undergraduate Assistant

Guilherme Sueiro, Visiting Undergraduate Assistant

Jean Lucas Mendes Castro, Visiting Undergraduate Assistant

Giovanna Moreira, Visiting Undergraduate Assistant

Mariana Mota, Visiting Undergraduate Assistant

Malik Nkrumah, Visiting Undergraduate Assistant

Lucas Henrique Conti Affonseca, Visiting Undergraduate Assistant

Luiz Otavio Pradella, MS student