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Managing Grazed Wheat

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Managing Grazed Wheat Kent Martin Southwest Research Extension Center Kansas State University – PowerPoint PPT presentation

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Title: Managing Grazed Wheat


1
Managing Grazed Wheat
  • Kent Martin
  • Southwest Research Extension Center
  • Kansas State University

2
What Cattle Remove
  • It takes approximately 1,000 lbs forage to
    produce 100 lb beef.
  • May vary depending on efficiency of pasture and
    livestock
  • Nitrogen needs
  • It takes roughly 30 lbs to produce 1,000 lbs
    forage or 100 lb beef

3
What Cattle Remove
  • Phosphorus
  • There is about .8 P2O5 in wheat forage
  • Removal 8 lb P2O5
  • Potassium
  • There is about 4.8 K2O in wheat forage
  • Removal 48 lb K2O

4
Nutrient Recommendations
  • Add 30 lb per 100 lb beef removed
  • No P or K needed unless soil tests indicate a
    deficiency

5
Fate of Nutrients in Manure
  • Nitrogen
  • 30 liquid manure is available first year
  • 25 solid manure is available first year
  • Phosphorus
  • 50 available
  • Potassium
  • 80-90 available

6
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7
  • Redistribution of nutrients

8
What is FHS
  • Wheat developmental stage when jointing first
    begins (GS 5)
  • Research has shown this is the optimal time to
    remove cattle from wheat pasture
  • Several factors influence when FHS occurs

9
How to Check for FHS
  • FHS can be identified below the soil surface, but
    above the crown
  • Must check for FHS in nongrazed wheat of same
    variety and planting date

10
First Hollow Stem
11
Select a large stem and cut off just above the
root
12
Cut vertically through center of the stem
13
What to look for
Growing point
Nodes
Node
5/8or 1.5 cm
Hollow stem
14
1.5 cm
15
First Hollow Stem and Yield
50
40
30
Grain yield (bu/ac)
20
10
0
-56
-42
-28
-14
0
14
28
Days from first hollow stem
16
First Hollow Stem and
60
40
20
0
Net returns (/ac.)
-20
-40
-60
-80
-56
-42
-28
-14
0
14
28
Days from first hollow stem
17
First Hollow Stem and
18
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19
First Hollow Stem (day of year)
20
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21
What Determines FHS
  • Variety
  • Location
  • Planting date
  • Temperature (fall and spring)
  • Moisture
  • Grazing

22
Summary
  • 5/8 or 1.5 cm of hollow stem FHS
  • Check in an nongrazed area of same variety and
    planting date
  • 1.25 bu/ac/day loss for grazing past FHS
  • Added beef lbs. do not make up for lost yield
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