phosphorus fertilizer correlation to kansas … fertilizer correlation to kansas soybeans robert...
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![Page 1: Phosphorus Fertilizer Correlation to Kansas … Fertilizer Correlation to Kansas Soybeans Robert Florence and Dave Mengel Kansas State Soil Testing Lab . ... North Central Soybean](https://reader031.vdocument.in/reader031/viewer/2022022004/5aa6c43a7f8b9ab4788ed640/html5/thumbnails/1.jpg)
Phosphorus Fertilizer Correlation to Kansas Soybeans
Robert Florence and Dave Mengel Kansas State Soil Testing Lab
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What is a fertilizer correlation?
• Compare yields of non-fertilized areas to fertilized areas • across a range of soil nutrient levels – low to high • measured by a nutrient extractor – Bray, Mehlich... • Relative yields are used to compare across environments
• “Critical level”
• Where a non-fertilized yield almost equals a fertilized yield
Relative Yield % = Yield of plot with no fertilizer
Maximum yield from fertilized plot x 100
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Fertilizer Correlation Graph (Ideal)
Soil test (ppm)
Re
lati
ve Y
ield
%
No
n f
ert
ilize
d p
lot
100
50
0
Deficient Sufficient
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North Central Soybean Critical Levels
Source Term used Mehlich-3 or Bray-P1 Soil depth
ppm Inches
Kansas State Univ. Critical Level 20 6
North Dakota State Univ. Critical Level 15 6
South Dakota State Univ. Critical Level 15 6
Nebraska Univ. Critical Level 12 8
Iowa State Univ. Optimum 16-20 6
Michigan State Univ. Maintenance Fertilizer 15-30 8
NCERA-13
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Our Goals
1) Review past P fertilizer applications on soybeans. 2) Conduct a current study evaluating soybean response to P fertilizer. 3) Examine if starter P fertilizer enhances yield above broadcast alone.
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Past Data
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30 35 40 45
Re
lati
ve Y
ield
Pe
rce
nt
Bray P1 or Mehlich 3 P (ppm)
< 30 bu/acre average
> 30 bu/acre average
Kansas Fertilizer Reports – Agronomy Dept. from 1966 to 1988
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Current Trials
2012 2013 2011
2
2
2
Sites
2011 2012 and 2013
Lbs P2O5 / acre
0 0
20 20
40 40
60 60
80 80
100
P broadcast as MAP (11-52-0)
Treatments
4 replications per site
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Measured
Soils samples before fertilizer
Harvest
15’ (6-30” Rows)
Set up
Weighed on site
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Broadcast Results
------------------- P2O5 lbs / acre ---------------
Location Mehlich 3 P 0 20 40 60 80 100 Probability
County ppm -------------------- Yield bu / acre ---------------
Woodson - 2011 5 32 B† 38 A 37 A 37 A 37 A -- 0.07
Lyon 8 17 17 18 17 19 18 0.57
Douglas 11 43 43 41 43 46 45 0.90
Atchison 11 48 B 41 C 50 B 48 B* 53 AB 58 A 0.00
Woodson - upland 16 32 36 37 34 33 34 0.42
Woodson - lowland 16 60 61 61 61 60 61 0.76
Cherokee - 2011 16 28 26 28 29 29 -- 0.66
Riley - Manhattan 21 53 51 54 53 51 56 0.65
Riley - Randolph 23 56 59 57 59 58 62 0.32
* Plot 203 removed
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Correlation
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30 35 40
Re
lati
ve Y
ield
Pe
rce
nt
Mehlich 3 P (ppm)
2011
2013
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Treatment Broadcast MAP
Starter APP
Total
---------------- P2O5 lbs/ac ----------------
1 20 0 20
2 0 20 20
3 40 0 40
4 20 20 40 5 60 0 60
6 40 20 60 7 80 0 80 8 60 20 80 9 100 0 100
10 80 20 100
Broadcast alone vs starter
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Split Results
60
65
70
75
80
85
90
95
20 40 60 80 100
Re
lati
ve Y
ield
lbs P2O5 / acre
Broadcast Alone with Starter
Across All 2013 sites except Lyon Co.
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Summary Correlation Data
Broadcast vs with starter
No response was seen above 16 ppm in 2013 The critical level could be between 15 and 20 ppm P
No difference was observed when similar amounts of P were applied
Remember phosphorus removal
0.8 lb P2O5 / bushel
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Thanks to…
Kansas Fertilizer Research Fund
Co-operating Farmers
Fellow research group workers