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Global Community of Practice on Conservation Agriculture <[log in to unmask]>
Date:
Mon, 15 Jan 2018 22:16:28 +0000
Reply-To:
Amir Kassam <[log in to unmask]>
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From:
Amir Kassam <[log in to unmask]>
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*Global CA-CoP* *CONSERVATION AGRICULTURE COMMUNITY OF PRACTICE*

*for sustainable production intensification and land management*

Dear Subscribers,

Please see attached a paper by Tullberg, Antille, Bluett, Eberhard and
Scheer (2018). Controlled traffic farming effects on soil emissions of
nitrous oxide and methane. Soil & Tillage Research 176, 18–25.

Thank you Jeff for sharing.

*Amir Kassam *

*Moderator*

e-mail: [log in to unmask]
URL: www.fao.org/ag/ca

---------- Forwarded message ----------
From: Jeff Tullberg <[log in to unmask]>
Date: Fri, Dec 8, 2017 at 2:28 AM
Subject: Conservation agriculture and climate change
To: [log in to unmask]

Hi Amir.



A long time since we talked! Good to see you continue distributing CA
information.  I noted the bit on climate change – and like most FAO stuff,
properly orientated towards the developing world.



I continue to work gently on CTF impacts on sustainability, and there might
be interest in our recent demonstration that Controlled Traffic Farming
reduces soil emissions by 30 – 50%. The average effect should be about 100
kg/ha CO2 – e in dryland cropping in Australia (very large properties, big
equipment, low input no till systems). And this is before accounting for a
fuel saving of 20 – 30%.



Most soil emissions are generated in the surface 10 cm: and compaction in
this zone is proportional to tyre pressure, which is not wildly different
between the single axle tractors and 500HP giants, and particularly
relevant to no-till systems.



Cheers – Jeff





*Dr J N Tullberg*

*Australian Controlled Traffic Farming Association*

*8 Hakea Cres, Chapel Hill, Qld 4069
<https://maps.google.com/?q=8+Hakea+Cres,+Chapel+Hill,+Qld+4069&entry=gmail&source=g>*

*Tel/Fax:   07 33785249*

*Mob: (+61)0417134372 <+61%20417%20134%20372>*

*http://actfa.net/ <http://actfa.net/>*

*[log in to unmask] <[log in to unmask]" target="_blank">http:[log in to unmask]>*









Tullberg, Antille, Bluett, Eberhard and Scheer (2018). Controlled traffic
farming effects on soil emissions of nitrous oxide and methane. Soil &
Tillage Research 176, 18–25



Abstract.

Soil compaction affects soil aeration and gas diffusivity, and thus has a
major impact on the release of greenhouse gases (GHGs) from fertilised
soils. Controlled traffic farming (CTF) systems reduce the area of
compacted soil by confining all field traffic to permanent traffic lanes,
and a pilot trial at one long-term CTF site provided evidence of reduced
soil emissions. We investigated the effect of CTF on soil emissions of
nitrous oxide (N2O) and methane (CH4) using replicated manual chamber
measurements in 3 traffic treatments; namely: non-trafficked CTF beds,
permanent CTF lanes, and a single traffic pass on CTF beds to simulate the
random traffic tracks of non-controlled traffic farming. Emissions of N2O
and CH4 were monitored from these treatments in 15 crops over 3 years on 6
grain farms in Queensland, Victoria and Western Australia. This work has
demonstrated that N2O emissions from trafficked soil were consistently and
significantly greater (by an average factor of 2.2) than those from non-tra
fficked soil. At the same time, soil CH4 consumption was significantly
increased in the CTF beds compared to random-trafficked or permanent traffic
lanes, although overall CH4 fluxes were small. Permanent traffic lanes
normally represent only 10%–15% of field area on controlled traffic farms,
compared with∼50% or more trafficked area on non-controlled traffic farms.
Thus, the results indicate that adoption of controlled traffic could reduce
total soil emissions by 30%–50%. This demonstrates that CTF will reduce
soil emissions of N2O and CH4 from mechanised crop production, while
providing other agronomic, environmental and economic benefits.

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