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methane emissions intensity benefits from better
pasture
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Now incorporating a methane charging calculation
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About
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Version:
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13/10/2022
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There are two
important measures relating to methane emissions from farmed animals. They
are gross emissions and emissions intensity, ie per kg
of carcase weight.
For many farming operations, particularly hill country, reducing the latter
is easier than reducing overall emissions without de-stocking.
Paradoxically however, the strategy to achieve this impacts negatively on
the former for a given area of land.
Methane is directly related to dry matter intake (consumption) {DMI}. For
NZ pasture fed cattle, the factor is 21.6gm per kgDM. It therefore follows
that the provision of higher nutritional value dry matter of would be
advantageous. This, coupled with a more intensive grazing management regime,
has the added benefit of promoting greater daily weight gain, itself of
benefit because it reduces the grazing days to a target liveweight. (A
significant part of the daily intake requirements is for
"maintenance".)
The paradox comes because these modern higher nutritional value grasses
grow significantly more dry matter per year than, for example, old rye grass
and browntop pastures.
The gold plated version of the strategy to reduce product intensity comes
at a high capital cost because it usually involves subdivision, ie fencing,
water reticulation and regrassing.
This App offers the ability for a user to analyse the benefits that can be
derived in the methane emissions space from better pastures and a more
intensive grazing regime.
Disclaimer: While
every effort has been made to ensure that the contents of the App are
accurate at the version date, no consequential decisions should be made
without first obtaining appropriate professional advice.
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If you want to be
able to share scenarios, you can create a unique login to save your data. Tap
the Button below and when the App opens Bookmark (or save to Home screen) the
URL. You can share that login URL.
There is no limit to the number of logins you can create, its just a case
of keeping a record!
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Base Assumptions
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CH4 / KgDM
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CH4 GWP
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times CO2
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Target kg (Lw or Cw)
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The section below
allows the user to test a range of weight and growth rate scenarios (eg Lw versus Cw, etc) before
populating the variables in the analyser model.
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Assume:
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Yield
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KgLwg
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Days
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KgLw
Start
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Lwg pd (max 2kg)
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End
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Days
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Tot MjME
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MjME pd
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KgDM pd
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Total Kg CH4
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Lwg/ha pa
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Kg CO2e
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Assume: Yield
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MjME
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/kgDM
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DMI pa/ha
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Assume: Yield
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MjME
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/kgDM
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DMI pa/ha
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Annual CH4/ha, (based on DMI) =
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These feed
requirements have been derived from interpolated Beef and Lamb NZ published
research data.
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Test drive a methane
charging regime
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On October 11, 2022
the government announced its preferences for charging for methane emissions
from 2025. It accepted some of the He Waka Eke Noa (HWEN) proposals but not
others, with the most significant rejection being that the government will
determine the price of methane (CH4) emissions.
A consultation period starts straight away, finishing on November 18.
Given this development, one has to assume that the price will be based on
the latest price of NZUs. By 2025,
that will be at least $100 per tonne (mt) so we'll use that as a starting
number. The CH4 price would then be $2,500/mt or $2.50 per kg. In the first year, there is a 95% discount,
reducing by 1% pa (until 2029 or for 10 years, not yet confirmed) resulting
in a likely charge of around 12.5c/kg.
Note: Nitrous oxide will be charged for on the basis of its GWP factor of
298 albeit also benefiting from the discount for a limited number of years.
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Analysis
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CH4 GWP
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CH4/KgDM
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Disc
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Phaseout of discount
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Analysis year
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© 2022 NZAgri.com - All rights reserved
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