Chad Lee © 2006 University of Kentucky 1 Wheat Stand Counts Presentation by: Chad Lee, Grain Crops...
-
Upload
jodie-sherman -
Category
Documents
-
view
217 -
download
0
Transcript of Chad Lee © 2006 University of Kentucky 1 Wheat Stand Counts Presentation by: Chad Lee, Grain Crops...
Chad Lee © 2006 University of Kentucky 1
Wheat Stand Counts
Presentation by: Chad Lee, Grain Crops Extension Specialist
University of Kentucky
Chad Lee © 2006 University of Kentucky 2
Most of the information comes from:
ID-125: A Comprehensive Guide to Wheat Management in Kentucky
Chad Lee © 2006 University of Kentucky 4
Three Critical Management Issues
1. Seeding: Date, Depth, Rate2. N Rate and Timing3. Fusarium Head Blight
Chad Lee © 2006 University of Kentucky 6
Determining Plant Density
1. Use a yardstick or dowel rod 3-ft in length
2. Count all plants in the 3-ft length of row. Record the number.
3. Repeat this in 5 locations across the field. Record all numbers.
4. Determine the average of the counts.5. Calculate the plants per sq ft with the
following equation…
Chad Lee © 2006 University of Kentucky 7
Determining Plant Density
Plant number = (plant count x 4)
Row width in inches
Calculate the plants per sq ft with the following equation…
Chad Lee © 2006 University of Kentucky 8
Tiller Counts
Feekes 3: Tillers formed. 70 - 100 tillers/ft2 adequate.
Only count tillers (including main stem) with three or more leaves.
Less than 70 tillers/ft2: N should be applied.
Chad Lee © 2006 University of Kentucky 9
Planting Date Effect on Tillers
Date Seeds/ft2 Tillers/ft2
Location 1 (1997-1998)
Oct 14 37 101
Oct 14 23 93
Oct 25 37 58
Nov 7 37 45
Location 1 (1996-1997)
Oct 14 39 83
Oct 14 23 61
Oct 24 39 57
Nov 17 39 50
From: Weisz et al. 2001. Agron. J. 93: 435-442. (NC State University)
Chad Lee © 2006 University of Kentucky 10
Planting Date Effect on Tillers
Date Seeds/ft2 Tillers/ft2
Location 2
Oct 22 39 33
Oct 22 23 31
Nov 12 39 29
Nov 20 39 28
Location 3
Oct 22 39 39
Oct 22 23 38
Nov 12 39 33
Nov 20 39 22
From: Weisz et al. 2001. Agron. J. 93: 435-442. NC State University (1996-1997 data)
Chad Lee © 2006 University of Kentucky 11
Head Counts
• Feekes 10.5: – All heads out of sheath.
• 60 to 70 heads/ft2 are ideal.– 600 heads/yd2
– 35 kernels/head (16 to 18 spikelets/head).
• 55 heads/head will result in adequate yields.– 500 heads/yd2
• 90 to 100 heads/ft2 will likely result in severe lodging.
Chad Lee © 2006 University of Kentucky 12
Head Count Effect on Yield
Princeton, 2003
0
20
40
60
80
100
120
0 50 100 150
Head Count per Square Foot
Yie
ld (
bu/acr
e)
Lexington, 2003
0
20
40
60
80
100
120
0 50 100 150
Head Counts per Square Foot
Yie
ld (
bu/acr
e)