Sulphur Fertilization: What Has Changed?...•MicroEssentials S15 –Onionskin •RRS , sulphur95...
Transcript of Sulphur Fertilization: What Has Changed?...•MicroEssentials S15 –Onionskin •RRS , sulphur95...
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Sulphur Fertilization: What Has Changed?
Cynthia Grant – AAFC Brandon
Rigas Karamanos - Viterra
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Sulphur Deficiencies are Increasing
Internationally
• Air quality standards reduce aerial
input
• Purer, high analysis fertilizers
reduce S input as “contaminant”
• Higher crop yields increase
demand and crop removal
• Organic matter depletion and
higher crop removal reduce soil
reserves
2
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What’s Changed Locally in Crop Production?
• Increasing production of canola
– Tighter rotations
• Shift to higher yielding canola hybrids
• More movement towards reduced tillage
• Different S sources
– MicroEssentials S-15
– Various elemental products
– Traditional ammonium sulphate
– Ammonium thiosulphate
• Weather always changes . . . 3
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SOME THINGS NEVER CHANGE . . .
Some Things Never Change
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Sulphur Deficiency is Very Common In Canola
• Canola requires more S than
cereal and pulse crops.
Wheat Canola Peas Alfalfa Corn Soybeans
Yield (bu/ac) 40 35 50 5 t/ac 100 35
Sulphur removal
(lb/ac) 4 11 7 34 7 4
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Sulphur deficiency can severely reduce
canola yield
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An adequate S Supply is Needed to Avoid Deficieny
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Sulphur Supply is Highly Variable Across a
Field
• Sulphur deficiencies are usually
patchy in a field, since S supply
is normally highly variable
• Variable nature also makes soil
testing challenging – High S concentrations in one area can
conceal deficiencies in other areas
• S supply also varies with depth
– Gypsum or mild salinity in the lower
depths may be missed with shallow soil
testing
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Plants Access Sulphate from Soil Solution
Soil solution
SO4-2
Rain, irrigation,
atmospheric
deposition
Gypsum
leaching
S must be in the sulphate
form for crop uptake
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Plants Only Absorb Sulphate-S
Soil solution
SO4-2
Sulphate forms are
immediately available
Elemental forms must
oxidize to sulphate
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A Range of Sulphur Sources Are Available
• Ammonium sulphate
• Ammonium
thiosulphate
• Gypsum
• Microessentials S-15
• Elemental S
• Bentonite blends
• Rapid Release
Sulphur
• Microessentials S-15
Sulphate Sources Elemental Sources
Manage sulphate and elemental sources differently
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Ammonium Thiosulphate Converts Rapidly to
Sulphate
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Gypsum is a Traditional S Source in Many
Areas
• Calcium sulphate (CaSO4·2H2O)
• Lowers pH if soil pH is greater than 8.5 and increases it if soil is
less than 4.5
– Not common on Manitoba soils
• Used for reclamation of soils that are high in Na
– Where leaching will move the replaced Na
• Can be used as a sulphate source
– Solubility is low relative to ammonium sulphate
– Solubility reduced on soils with high Ca in soil solution
– The Ca is normally not needed on MB soils
– Tends to be difficult to handle and apply
– Strongly marketed because it is a waste product for disposal 13
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Sulphate Sources Are Immediately Available so Timing of
Application is Flexible
• Ahead of seeding
– S portion will not volatilize
– May possibly immobilize or leach but to
lesser extent than nitrate
• Near seeding
– Readily available
– Reduces risk of leaching below rooting zone
• Post-seeding
– Can be effective, even when delayed
– Option where deficiencies are noticed late
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Canola Response is Still Greatest When S is
Supplied Near Seeding
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Seed
Yie
ld I
ncre
ase
(T
/ha)
At seeding At bolting At Flowering
Application Timing
Malhi and Leach, 2002
100%
75%
60%
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Managing Post-Emergence Sulphur
• Watch for deficiencies early
– spraying time.
• Act quickly when you see a
problem and use sulphate
sulphur.
• Understand the deficiencies
may “disappear” with crop
rooting into gypsum, salts or
leached S
– Need to assess sulphate
supply below the plough layer
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Sulphate Sources Are Mobile in the Soil so
Placement Options Are Flexible
• Banding – pre-plant, mid-row or side-banding
• Broadcast
• Dribble-band
• Seed-placement
– Avoid excesses that could cause toxicity
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Excess Seed-placed Ammonium Sulphate can Cause
Seedling Damage in Canola
• Stand density decreased with increasing rates of ammonium sulphate and MAP
• Most damage occurred with highest rates of MAP and AS
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Elemental Sources Must Oxidize to Sulphate
• Requires time and conditions for microbial activity
• Apply far before crop requirement
• Use finely divided product
• Broadcast rather than band
– Want to maximize contact with microbes
• Leave on surface to “weather”
• Incorporate after weathering
– Conversion may be slower if left on surface under reduced
tillage
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Environmental Conditions Affect Oxidation to
Sulphate
• Conversion for elemental S to available sulphate is
mainly by microorganisms
• More rapid conversion when soils are warm and moist
– Slower under very wet or very dry conditions
– Slower under cold conditions
• Under Canadian conditions, we cannot rely on elemental
sources to provide enough available sulphate on
deficient soils during the following crop year
– May be beneficial in long-term planning
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Sulphur Source Study at Melfort from 1996 to 1998
One broadcast application of 20 kg S ha-1 in 1996
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Sulphur Products in a Broadcast Application
1.2
2.9
1.4
1.8
1.2
3.6 3.63.8
0.6
2.8
2.5
1.8
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Ck SO4 T 90 S 95 Ck SO4 T 90 S 95 Ck SO4 T 90 S 95
Alf
alf
a Y
ield
(t
ha
-1)
Year 1
(1998)
Year 2
Year 3
Source: Cowell and Johnston, Ag Canada, 2001
S surface broadcast applied at 50 kg ha-1 once in spring 1998
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Weathering on the soil surface speeds
breakdown, while band-placement restricts it
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Freshly applied T-90 pellet
T-90 pellet after 90 days
in seed-row
Pellet after
weathering on soil
surface
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24
In-Soil Banding Delays the Availability of Elemental S
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New Products Aim to Hasten Conversion of
Elemental S
• MicroEssentials S15
– Onionskin
• RRS , sulphur95
– Greater dispersion
– Smaller particles
25
Greater dispersion and contact with
microorganisms should hasten oxidation
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MicroEssentials S15 by Mosaic
13 – 33 – 0 - 15
• Ammonium Phosphate
• Ammonium Sulphate
• Elemental S
½ S in sulphate form (plant available)
½ S in elemental form (requires conversion)
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Advantages of MicroEssentials S15
• Lower salt index than a blend of MAP and AS
– Improved seed safety
• Better distribution of P and sulphate in the seed-row
• Co-granulation of AS and MAP may improve P uptake
• Conversion of elemental to sulphate does not appear to
be hastened
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-Only count on ½ of the S being available since
elemental S will not convert rapidly
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2
8
Availability of S15 was Intermediate Between
Elemental and Sulphate Source
S Uptake
0
5
10
15
20
25
30
mg
S u
pta
ke
Check Elemental S S15 Ammonium Sulphate
Plant Yield
0
5
10
15
20
25
30
g/p
ot
Check Elemental S S15 Ammonium Sulphate
(U of M thesis by Kroeker 1995)
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MicroEssentials S15 and RRS had lower
seedling toxicity than ammonium sulphate
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Weather Can Affect S Deficiency
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Sulphur Deficiencies in Canola are More
Frequent After Wet Years - 1999, 2010 and 2011
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Leaching in Wet Years or Field Areas Increases
Risk of Deficiency
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Strong S Response Occurred in 2010
Be particularly alert for S
deficiencies after a wet year
that promoted leaching
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Do Hybrid Cultivars need More Sulphur?
• Most cultivars grown in Canada are hybrids
• Yield potential is substantially higher than older OP
varieties
• Removal of S over time will be greater with higher yield
• Hybrids appear to have higher root activity and greater
ability to extract S from the soil than OP cultivars
• Hybrids produce more yield at a given S level than OP
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Yield of OP or Hybrid Canola as a function of N
application with or without 40 kg S ha-1
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1500
2000
2500
3000
3500
4000
4500
0 20 40 60 80 100 120 140 160 180 200 220
Nitrogen rate, kg N ha-1
Se
ed
yie
ld,
kg
ha
-1
1500
2000
2500
3000
3500
4000
4500
0 20 40 60 80 100 120 140 160 180 200 220
Nitrogen rate, kg N ha-1
Seed
yie
ld, kg
ha
-1
OP Hybrid
•Hybrid cultivars produced higher seed yield than OP
lines but did not require additional S
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Adding N without S Can Depress Canola Yield on an
S-deficient soil
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Can
ola
Yie
ld (
t/h
a)
Control
N banded
N broadcast
Increasing N with S
Increasing N with No S
Led to the idea that a specific N:S ratio was needed
– between 5 and 7 N to 1 S
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Adequate S is Needed, But Specific N:S Ratio May Not
Be That Important
• High N:S ratio can indicate an S
deficiency
• However, once a S deficiency is
corrected there is little or no
response to adding more S with
increasing N rate.
• Worry about supplying the
required S rather than about a
precise N:S ratio
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Sulphur Fertilization and Protein Content
• Bread-making quality requires protein quantity and quality
• Protein premiums for wheat reflect the importance of
protein in crop quality
• Nitrogen and sulphur are both required for protein
production
• S-containing amino acids are important for bread-making
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Effect of S Fertilizer in Wheat on Loaf Height Occurred
at Sites where Yield Response Occurred as Well
a
b
aa
a
b
100
103
106
109
112
115
118
121
Lo
af
He
igh
t (m
m)
Athabasca Erickson Melfort
0 lb S/ac 18 lb S/ac
Unger
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Sulphur has a Small Effect on Protein Compared to
Nitrogen
8
9
10
11
12
13
14
15
Enchant Airdrie Irricana Cartairs Red
Deer
Ft Sask Swift
Current
Swift
Current
No N
N Only
N+S
% Protein in Wheat
192 17 146 47 70 38 20 22
kg soil S in 0-60 cm Source; Westco, 1998
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Summary
• Traditional principles still apply
– Plants take up sulphate
– Elemental must convert to sulphate
– Conversion of elemental is slow in prairie soils
• Conversion of elemental in new products isn’t rapid
enough to supply S in year of application
– May be other benefits in seed safety or distribution
• Hybrids extract S efficiently from soil and may not
initially need more S than OP
– May increase depletion on poorly buffered soils
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Summary
• Recognise S variability across field and within
soil profile
• Don’t worry too much about specific N:S ratios
– High N:S ratio can indicate an S deficiency
– Correct the S deficiency
• Effects on protein content and quality are only
likely where S is low enough to reduce yield
• Very wet conditions can lead to leaching and
increase the risk of S deficiencies
– Keep alert for S problems in wet years
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Thank You for Your
Attention