Cover Crops What we have learned on claypan...
Transcript of Cover Crops What we have learned on claypan...
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Cover CropsWhat we have learned on
claypan soils
Mike Plumer
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Field without a cover crop – severe erosion
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3After a 5” rain storm– little erosion and clean water
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4Notice lack of soil movement
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5Stand of annual ryegrass in November
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Reasons to Use GrassCover Crops
• Improved soil tilth• Increase Organic Matter• Increase soil biological activity• Improve soil structure• Increase soil moisture holding capacity• Capture nitrogen• Cycle nutrients• Control soil erosion and protect water quality
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Cover crop effectswheat/buckwheat/hairy vetch on 90 yr old fertility plot
Plot Corn yield bu/a
150N
conventional
117.0
No-till No lime(pH5.1) Lime(pH6.7)
0-0-0 3.6 81.4
0-P-0 60.0 78.6
0-0-K 24.3 117.1
0-P-K 50 121.4
Plumer, U of IL
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Tracing
Tracing corn root development With annual ryegrass cover crop10
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To preserve plot Integrity we have gone to a 3”soil Probe we built
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Soil probe sample we are tracing the ryegrass roots
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Soybean root following
previous root channel
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Soybean root following
previous root channel
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6 years cover crops and no-till corn root development
20
To
23”
23
to
28”
37
to
43”
46
to
50”
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Disk and field cultivate 6 years no-till
plus cover crop
of ryegrass in
fragipan soil
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Soybean root development
under ryegrass cover in
August
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Soybean root development
under ryegrass to over 25”
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Rooting systems
• Oil seed radish macro pores, 4-16”• Rape 10-15”• Oats fibrous, 8-15”• Hairy vetch fibrous, 12-15”• Annual ryegrass fibrous, 28-60”• Cereal rye fibrous 18-24”• Austrian winter pea variable, 8-14”• Wheat fibrous, 10-16” • Triticale fibrous, 10-20”• Turnips macro pores, 4-8”
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Living winter cover
• Increases soil biological activity
• Move nutrients from subsoil
• Make nutrients more available
• Improve crop production
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10 years grass CRP no-till vs continuous no-tilled field
Soybean yield
No-tilled into CRP sod
Farmed those 10 years
1st yr.No-till
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Soil Tests in ryegrass Cover Crop
0
50
100
150
200
250
300
cover crop
2000
no cover
crop 2000
cover crop
2003
no cover
crop 2003
0 to 6" P
subsoil 35" P
0-6"K
subsoil 35" K
No fertility added4 years,3 repsC-S rotation
Plumer, U of Il
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Rank Field Cover Yield
1 THEO 4 Vetch 204
2 SIMP 13 Ryegrass 194
3 HOLL 4 Vetch 188
4 SMITH 4 Ryegrass 183
5-17 Ryegrass 178
18 THEO 3 None 164
36 WEAVR 8 Ryegrass 110
38 WEAVR 9 Ryegrass 104
TERRY N. TAYLOR FARM- 38 different fieldsCORN YIELDS on Cisne claypan soils
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Cover CropPicking up excess nitrogen from Anhydrous tracks after corn
Frost damage on lush growth
Taylor farm
Upton farm
24Plant has been shown to uptake 800#/a of nitrogen after manure application
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Nitrogen Uptake
• Continuous no-till
• Corn after Corn
• 200#N/a = 215 bu/A
• 3642 #/A. annual ryegrass Jan. 6
• 2” of water applied, leached
84 #/a of Nitrogen from ryegrass
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Nitrogen availability
• Depends on cover crop stage of growth
– Vegetative grass stage yields most available
• Leachable from top growth
• Residue must decompose to recover all nutrients– especially if mature
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Nitrogen and cover crop maturity
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At this stage of maturity no nitrogen is available and may cause nitrogen deficiency
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COVER CROPS
• PLAN EARLY
• PLANT EARLY
– Good seed to soil contact
– Plant into the soil ¼ to ½ “ deep
– Leave residue cover to hold moisture for germination
– Aerial seeding must be timed properly
• Corn- 50% sun on ground or yellowed/browning
• Soybeans- leaves yellow and falling
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Drilling produces the best stand, the quickest29
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Cover CropSpring Burndown Management
• Plan on date/growth stage to kill
– Smaller easier to kill, less mulch
– Later, concerns over wet soils, dry soils, getting a crop stand
• Match herbicides to cover crop
• Plan on 2 herbicide applications
• Know your planters limitations
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Glyphosate Issuesin Spring
• Glyphosate only works when plant is activelygrowing– Need sunny days
– Above 50 degree temperature
– Cold weather means morning only spraying
– NO triazines in mix
• Use additives– AMS or other like products
– 10 gallons water/ acre
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Evaluate herbicides and herbicide timing32
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Not all herbicides work well to kill cover crops in cool weather576 plots tell the story
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Selecting the right herbicide provides excellent control34
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Annual Ryegrass Herbicide
trial
Means
treatment
gly51 22oz 9.7
gly 51 32oz +2,4-D 10
gly 51 32oz + calisto 7oz 6.3
gly51 32oz + Prowl H2O 3 pt 10
gly51 32oz + resolve 2 oz. 10
gly51 32 oz + Basis 1 oz 10
gly51 32oz + Balance Pro 4oz 10
gly 51 32 oz 10
LSD 0.05 0.6
Control at 36 das
Plumer, U of Il.
Sprayed at 1st to 2nd joint stage, mid April
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Soybean Cyst Nematodes
• May result in 8-10 bu/ac yield increase if high cyst populations
Soybean Cyst Nematodes
Egg Count
Bare Cereal Rye Annual Ryegrass
NW 7533 717* 117**
SW 3650 320* 0**
LF 1559 722* 386*
JA 1202 390* 279*
Additional research needed
2 years /3 replications
* Significant .05
** Significant .01
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Yield advantage
101.9
52.5
79
61.5
155.7
121
0
20
40
60
80
100
120
140
160
conventional no-till conv
06/notill07
notill +
ryegrass cover
2006
2007
9 replications 20068 replications 2007
Plumer U of Il.
2007 3” rain-April-Oct.Claypan soil
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Questions?
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Organic Matter
• Can supply up to: (3%som)
– 25-100 # N/A
– 6-8 # P/A
– Provide pool of other nutients
• Chelates nutrients to prevent loss
• Improve soil structure
• Promote organisms that improve nutrient availability
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long no-till
carbon#/a
3.10 6692.65
3.10 6692.65
3.10 6692.65
3.10 6692.65
3.10 6692.65
3.20 6908.54
3.20 6908.54
2.90 6260.87
2.90 12521.74
2.40 10362.82
1.70 7340.33
83766.1
carbon #/a
0.80 1727.14
1.10 2374.81
1.00 2158.92
1.00 2158.92
1.00 2158.92
0.80 1727.14
0.50 1079.46
0.50 1079.46
0.50 2158.92
0.90 3886.06
1.10 4749.62
25259.364
Long term no-till carbon sequestration
58506.73 #/a increase in a continuous no-till system
Soil Density- now1.09
1.18
1.37
1.36
0-1”
1-2
2-3
3-4
4-5
5-6
6-7
7-8
8-10
10-12
12-14
Ave . Density1.68
1.72