enemies of pasture establishment and legume regeneration ...€¦ · enemies of pasture...
TRANSCRIPT
![Page 1: Enemies of pasture establishment and legume regeneration ...€¦ · Enemies of pasture establishment and legume regeneration Dr Belinda Hackney ... • Selective herbicides ... •Hardseededness](https://reader030.vdocument.in/reader030/viewer/2022041017/5eca85869aeafb5f63706592/html5/thumbnails/1.jpg)
Enemies of pasture establishment and
legume regeneration
Dr Belinda Hackney
Paddock Priorities and other factors that might be affecting
nodulation
Belinda Hackney – CWLLS, Forbes
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Key issues
• Identifying what you have - Priorities
• Choosing tactics - Altering what you have
- Changing what you have
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Paddock priorities
• Given 10 paddocks on your farm, how do you
prioritise where to allocate inputs?
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Paddock priorities…….an example 10 paddocks
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
Poor soil depth Good soil depth
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
Maintain
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
Maintain Fertiliser
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
Maintain Fertiliser
Graze in summer/autumn
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
Maintain
Fertiliser
Fertiliser
Graze in summer/autumn
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
Maintain
Fertiliser
Fertiliser
Might be as good as it can be?
Grazing management Wrong spp.?
Graze in summer/autumn
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
Maintain
Fertiliser
Fertiliser
Might be as good as it can be?
Grazing management Wrong spp.?
Herbicide, grazing management
fertility?
Graze in summer/autumn
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
Maintain
Fertiliser
Fertiliser
Might be as good as it can be?
Grazing management Wrong spp.?
Herbicide, grazing management
fertility? Herbicide, grazing management,
fertility, species suitability?
Graze in summer/autumn
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
Maintain
Fertiliser
Fertiliser
Might be as good as it can be?
Grazing management Wrong spp.?
Herbicide, grazing management
fertility? Herbicide, grazing management,
fertility, species suitability?
Graze in summer/autumn
Maintain
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Paddock priorities 10 paddocks
2 paddocks 8 paddocks
1 paddock 1 paddock 6 paddocks 2 paddocks
2 paddocks 4 paddocks 1 paddock 1 paddock
1 paddock 1 paddock 3 paddocks 1 paddock
2 paddocks 1 paddock
Poor soil depth Good soil depth
Low fertility High fertility Poor legume content Good legume content
Low fertility High fertility Low weed burden High weed burden
Good drainage Poor drainage High litter load Low litter load
Low fertility High fertility
Maintain
Fertiliser
Fertiliser
Might be as good as it can be?
Grazing management Wrong spp.?
Herbicide, grazing management
fertility? Herbicide, grazing management,
fertility, species suitability?
Graze in summer/autumn
Maintain
Is it worth it?
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Options
Procrastinate Renovate Manipulate Maintain
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Options
Renovate Manipulate
Exploitable Difference • Grazing • Grazing plus herbicide • Selective herbicides • Non-selectives • Non-selective herbicides selectively
• +/- grazing • Introduction of other species
• Broadcast • Drill
• What’s the baseline • Different species and potential
Choose wisely – create exploitable differences
• Preparation • Species choice - tolerance to limitations - hardseededness/maturity time - dormancy - appropriate mixes • Fertiliser choice • Legume inoculation • Sowing rate • Sowing technique • Sowing depth • Sowing time
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Introducing other species into established
pastures
Common questions – ‘What can I grow with established……’
- Perennial pasture – grass or lucerne
Need to think about: - Site preparation
- ground cover
- retarding existing pasture?
- Moisture availability
- Method of introduction
- Rate of introduction
Space
Moisture Light
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Introducing other species into established
pastures - moisture
Common questions – ‘What can I grow with established……’
- Perennial grass
- Lucerne
NU 0-10 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
So
il m
ois
ture
(%
)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
NU 10-30 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
0.0
0.1
0.2
0.3
0.4
0.5
0.6
NL 0-10 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
So
il m
ois
ture
(%
)
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.6
NL 10-30 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
0.0
0.1
0.2
0.3
0.4
0.5
0.6
SU 0-10 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
So
il m
ois
ture
(%
)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
SU 10-30 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
0.0
0.1
0.2
0.3
0.4
0.5
0.6
SL 0-10 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
So
il m
ois
ture
(%
)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
SL 10-30 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
0.0
0.1
0.2
0.3
0.4
0.5
0.6
NU 0-10 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
So
il m
ois
ture
(%
)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
NU 10-30 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
0.0
0.1
0.2
0.3
0.4
0.5
0.6
NL 0-10 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
So
il m
ois
ture
(%
)
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.6
NL 10-30 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
0.0
0.1
0.2
0.3
0.4
0.5
0.6
SU 0-10 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
So
il m
ois
ture
(%
)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
SU 10-30 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
0.0
0.1
0.2
0.3
0.4
0.5
0.6
SL 0-10 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
So
il m
ois
ture
(%
)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
SL 10-30 cm
Sep-01 Dec-01 Mar-02 Jun-02 Sep-02 Dec-02 Mar-03 Jun-03 Sep-03 Dec-03
0.0
0.1
0.2
0.3
0.4
0.5
0.6
Source: Hackney (2009)
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Introducing other species into established
pastures – method of introduction
• How are you going to introduce new species?
- Surface broadcast
- Disturbance
- +/- retard existing pasture?
- Rate – more later
Source: Dowling et al. (1971)
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Sowing new pastures
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Weed seed bank-annual grasses
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3
% v
iab
le s
ee
d
Years
Annual ryegrass
Barley grass
Vulpia
Wild oats
Sources: Dowling et al (1991); Peltzer and Mason (1999);
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Weed seed bank – perennial grass weeds
Sources: Gardener et al. (2003); Lamoureaux et al. (2006), Maze et al. (1993)
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 5 12
% v
iab
le s
ee
d
Years
Chilean needle grass
Serrated tussock
African lovegrass
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Weed seed bank – broadleaves
Sources: Cheam (1987); Dunbabbin and Cocks (1999); Peltzer and Mason (1999); Green et al. (2010)
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4
% v
iab
le s
ee
d
Years
Wild radish
Fleabane
Spiny emex
Capeweed 1
Capeweed 2
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Remember…………..
•No herbicides to selectively remove annual grass weeds from perennial grasses in the year of establishment
•Get broadleaves under control ahead of time so use only ‘soft’ options in first year to maximise seed set
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Species choice – tolerance to limitations
•It’s about what you can grow given the limitations of paddock….not necessarily
what you want to grow.
•Think about:
- Soil physical conditions (depth, WHC, dispersion, waterlogging)
- Soil chemical conditions (pH, pH at depth, P, S……)
- Aspect, slope
=
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Legume tolerances and characteristics
Rainfall (mm)
pHCa Waterlogging tolerance
Hardseed (%)
RLEM tolerance
Native bud worm tolerance
Maturity (flowering)
Bloat risk
Subclover >350 4.5-8.0 sub-poor brachy- poor yann - good
Most <25 Most <25 Most <40
No Yes 85-160 High
Lucerne >375 5.0-7.5 Poor No Yes High
Bladder clover
>350 5.0-8.0 Poor 50-60 No Yes 110-120 High
Gland clover
>350 4.5-8.0 High 40-50 Yes Yes 100-120 High
Arrowleaf clover
>400 4.5-7.5 Poor 40-50 No Yes 130-180 Moderate-high
Balansa clover
>350 4.8-8.0 Very high Variable No Yes 95-130 High
French serradella
>325 4.0-7.5 Poor 0-50 No No 90-130 Nil
Yellow serradella
>300 4.0-7.5 Poor 60-95 No Moderate 95-140 Nil
Biserrula >325 4.2-7.0 Poor 70-90 No Yes 110-135 Low??
Sulla >400 5.5-8.5 Poor Low No Yes ~120 Nil
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Hardseededness and maturity time - legumes
•Hardseededness comes into play after the first year of
seed set - Bought seed is generally scarified
- Hard seed means the seed has a seed coat that is impermeable
(resistant) to water penetration
- Hard seed break down affected by
- Moisture
-Temperature
- Choose higher hard seed varieties in harsher/more variable
climates
•Maturity time - Refers to time to flowering
- Choose shorter season for harsher/more variable climates
- Caution – getting too extreme in subclover selections
•Serradella and biserrula indeterminant -will flower and
produce seed while moisture available
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Indeterminant plants, maturity time
Early spring seeds/m2
Late spring seeds/m2
Total seeds/m2
Biserrula 2715 3258 5973
Gland clover 2046 0 2046
Bladder clover 760 0 760
Subclover 250 0 250
Source: Hackney and Quinn 2016
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Choosing mixtures
•Think carefully when choosing mixtures
•With complex mixtures there can be difficultly
in:
- matching herbicides to all pasture components
- grazing to suit persistence needs of pasture components
- maintaining balance – grass/legume ratio
- initial dominant species may initially outcompete and
interfere with establishment of long term persistent
species
- simple is often better
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Fertiliser for pasture sowing and maintenance
• Cropping fertilisers (e.g. MAP and DAP) commonly used at pasture establishment
- Contain plenty of N and P………but
- No S
- More than 90% paddocks deficient in S
• Starter fertiliser containing N, P and S for sowing
- seeds only have sufficient N to supply seedlings for 7-10 days
- don’t forget about Mo for legumes in deficient areas
• Maintenance and building fertility
- soil test – P, PBI, S (not accurate for trace elements)
- No production benefit in applying fertiliser above critical levels
0
20
40
60
80
100
% m
axim
um
gro
wth
Available P
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Legume inoculation
pH
4.0
pH
4.5
pH
5.0
pH
5.5
pH
6.0
pH
7.0
pH
8.0
Subterranean clover Plant
Rhizobia
Serradella Plant
Rhizobia
Biserrula Plant
Rhizobia
Lucerne, annual medics Plant
Rhizobia
Red = poor , Orange = sub-optimal, Green = optimal
Source: Ron Yates, DAFWA; various
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Improving life for rhizobia
• Most rhizobia activity in top 20 cm soil with majority in the top 10 cm
• A relatively small change in pH via liming may induce significant change in nodulation and nitrogen fixation
• Non-legumes without access to nitrogen can’t perform at their best
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Improving life for rhizobia
0
100
200
300
400
500
600
700
800
Unlimed Lime
No
du
le n
um
be
r (n
um
be
r/g
roo
t)
a
b
pH 0-4 cm = 4.2 pH 4-9 cm = 4.0 pH 9-18 cm = 4.17
pH 0-4 cm = 5.6 pH 4-9 cm = 5.7 pH 9-18 cm = 6.0 pH 18-30 cm = 6.2
Richardson et al. (1988)
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Improving life for rhizobia
0
10
20
30
40
50
60
70
80
90
100
0-4cm 4-9cm 9-18cm 18-30cm
Pe
rce
nta
ge o
f n
od
ule
s (%
)
Unlimed
limed
Richardson et al. (1988)
More nodules (previous slide) and distributed through root system
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Improving life for rhizobia
Unkovich et al (1996)
0
10
20
30
40
50
60
70
80
90
pH 4.8 pH 5.1
Nd
fa (
%)
0
10
20
30
40
50
60
70
80
90
pH 4.6 pH 5.6
Nd
fa (
%)
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Improving life for rhizobia
Unkovich et al (1996)
0
10
20
30
40
50
60
70
80
90
pH 4.8 pH 5.1
Nd
fa (
%)
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How long do un-protected rhizobia live?
Event
Time Elapsed
(hours)Number & %
Surviving
per seed
At Inoculation (inoculant applied to
seed in a 0.75% methylcellulose slurry)
0 1,445,000 *
(100%)
Lupins mixed in vertical feed mixer
and augered into truck
1 141,200 # (9.8%)
Transported to field and augered into
air seeder box (sampled from seeder
box)
4.75 11,200 # (0.8%)
Planted by air seeder 4.8 6,761 # (0.5%)
Recovered from soil 22.5 1,175 # (0.1%)
* Theoretical number derived from number in inoculant slurry.
# Numbers determined by MPN method.
Reference: Roughley et.al 1993 Soil Biol. Biochem.25:1453-1458.
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Preparation – how much seed is in an
old pasture?
What is the weed seed level in a pasture?
Source: Bowcher 2002
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Weed seed bank-annual grasses
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3
% v
iab
le s
ee
d
Years
Annual ryegrass
Barley grass
Vulpia
Wild oats
Sources: Dowling et al (1991); Peltzer and Mason (1999);
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Preparation – how much seed is in an
old pasture?
What is the weed seed level in a pasture?
Annual grass Broadleaf weed
Continuous grazing 5859 1020
Spring hay cut 668 419
‘Ideal’ clean 59 10
Sources: Dowling et al (1991); Peltzer and Mason (1999); Bowcher (2002)
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•Sowing rates compared to weed seed bank are low
• Sub clover sown at 4 kg/ha
– 120 000 seeds/kg x 4kg/ha = 480 000 seeds/ha
= 48 seeds/m2
• Phalaris sown at 3 kg/ha
– 650 000 seeds/kg x 3 kg/ha = 195 seeds/m2
Sowing rate – how much do you use?
Annual grass Broadleaf weed
Continuous grazing 5859 1020
Spring hay cut 668 419
‘Ideal’ clean 59 10
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•Options –Stand alone
–Undersowing/cover cropping
–Summer sowing (need unscarified/in-pod seed)
–Twin sowing (need unscarified/in-pod seed)
Sowing technique
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Establishment technique and seed yield
-100
0
100
200
300
400
500
600
700
800
Bis
err
ula
Bis
err
ula
CC
Bis
err
ula
TS
Fre
nch
Fre
nch C
C
Fre
nch T
S
Bla
dder
Bla
dder
CC
Bla
dder
TS
Subte
rranean
Subte
rranean C
C
Seed p
roduced (
kg/h
a)
Source: Hackney et al. (2013)
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Sowing technique and seed size
0
20
40
60
80
100
Bis
err
ula
Bis
err
ula
CC
Fre
nch
Fre
nch C
C
Bla
dder
Bla
dder
CC
Subte
rranean
Subte
rranean C
C
Rela
tive s
eed s
ize (
%)
Source: Hackney et al. (2013)
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•Annual legumes - need to be sown in autumn (preferably early)
- NOT Winter – too cold
- NOT spring – not enough time to set seed
- options now for summer sowing……more later
•Perennial grasses and lucerne - autumn
- late winter/spring
- think about annual companion legumes
- after??
- before??
•Pastures containing perennial grasses will tend to run to grass dominance over time - legume seedbank and management for legume regeneration critical
Sowing time – when do you sow?
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Sowing time – when do you sow?
Moot et al. (2000)
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Sowing - depth
• Most pasture seed quite small:
• Subclover – 130 000 seeds/kg
• Balansa clover – 1 500 000 seeds/kg
• Lucerne – 500 000 seeds/kg
• Cocksfoot – 1 300 000 seeds/kg
• Phalaris – 650 000 seeds/kg
• Sowing depths > 1 cm can result in significant reduction in emergence
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Sowing - scale
• Better to do a small area well than a large area poorly
• Don’t compromise on
- Preparation
- Species/variety choice to suit paddock limitations
- Rate of sowing
- Don’t lower rate to increase area
- Seed nurseries can help get around this
problem
- Timing – if it’s getting too late, don’t do it.
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Beware………
Chemical residues
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Herbicides
Triasulfuron (LG) application on Sub clover (18 days growth) DAFWA Crop Pasture Group (Yates, Nutt & Loi)
3g 0.3g 0.03g 0.003g 0.0003g control
1/10 1/100 1/1000 1/10000 1/100000 of recommended rate
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Triasulfuron (LG) Pyroxasulfone (S) Control Chlorsulfuron (G) Clopyralid (LT)
Source: Ron Yates, DAFWA
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Photo: Jo Powells
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Photo: Jo Powells
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•Prioritise
•Know paddock limitations and what you can practically and economically do about them
•Manipulation only possible where there are exploitable differences
•If sowing new pasture, select to create exploitable differences
•Choose what you should grow
•Timing, timing, timing……….
Summary