Canterbury Farming, May 2020

Page 1

30,287 copies distributed monthly – to every rural mailbox in Canterbury and the West Coast

May 2020 Edition

INSIDE

THIS EDITION Investment needed

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Reviewed: New research indicates that dairy cattle produce less emissions than previously calculated.

New research reveals less dairy emissions

DairyNZ has welcomed the news that New Zealand’s greenhouse gas inventory has been updated to reflect new science on nitrous oxide emissions, which show that dairy cows and other livestock produce less emissions than previously estimated.

❚ by Kent Caddick New Zealand’s Greenhouse Gas Inventory is the official annual estimate of all human-generated greenhouse gas emissions. The most recent inventory for the period from 1990 to 2018 incorporates new research on livestock emissions on different land gradients. AgResearch and Manaaki Whenua scientists have carried out research for over a decade on livestock emissions. Scientists found that on rolling and steep hill country land, ni-

trous oxide emissions from urine is lower, as a result of factors related to soil composition and topography. Emissions for dairy cattle on flat land were also recalculated to be slightly lower as a result of their research. While the impact of the changes for 2017 is modest – with total dairy cattle emissions being 1.4 percent lower than previously estimated for that year, DairyNZ strategy and investment leader Dr David Burger said the research is important. “We now have more accurate estimations

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of livestock emissions on sloping land,” Burger said. “The current inventory calculations assume almost all dairy cattle are located on flat land, but we know that cows are often grazed on rolling land, particularly when they are young or during winter. “Once we have more data on the proportion of dairy cattle on sloping pastures, we will have a more accurate understanding of emissions which may see dairy nitrous oxide emissions change further. TO PAGE 2


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