Land domain updates

This page lists the changes we have made to the land domain indicator pages.

21 April 2017
Soil health and land use

Issue: Incorrect terminology and percentages in key findings
Revisions: Changes were made to key findings, shown by strikethrough text replaced by bold text below.

In surveys that were conducted from 2009–13, more than 80 percent of soil health indicators tests were within the target range for their respective land use.

  • All forestry and cropping/horticulture soils tests were within their target range for acidity.
  • Cropping/horticulture had the highest percentage (90 percent) of soils tests within targets for organic reserves.
  • Only 44 39 percent of dry stock soils sites and 22 23 percent of dairy soils sites were within their target range for physical status.
  • Between the first (1995–2008) and second (2009–13) survey periods, the proportion of soils sites within their target range for physical status decreased from 58 59 percent to 44 41 percent.

Reason for change: Incorrect percentages were calculated during data processing. Terminology errors a result of miscommunication with data supplier.

 

Issue: Incorrect figure 1 title, and y-axis title.
Revision: Shown by strikethrough text replaced by bold text below.
Graph title: Soil health indicators tests within target range.
Y-axis title: Percent of soil sites tests.
Reason for change: Incorrect terminology used in the graph title and y-axis title.
Note: We added a new figure (figure 2), to show the percentage of soil sites within target range for all indicators. The remaining figures in the webpage have been renumbered.

 

Issue: Missing footnote on figure 3 (previously figure 2)
Revision: Footnote added: ‘Some sites did not have a recorded value for all tests. Soil sites with missing tests were excluded from the analysis’.
Reason for change: This footnote was added to improve interpretation.

 

Issue: The terminology was not well explained in the Definition and methodology section. There were some numerical errors in the number of sites measured.
Revision: These changes were made to the Definition and methodology section, shown by strikethrough text replaced by bold text below.

Soil health indicators are classified into four types is informed by seven tests: These tests are classified into four indicators:

  • acidity (measured by soil pH)
  • organic reserves (measured by total carbon, total nitrogen, and mineralisable nitrogen)
  • fertility (measured by Olsen phosphorus)
  • physical status (measured by bulk density and macroporosity).

The data comes from nine regional councils, surveyed at 420 419 soil sites down to 300mm 100mm deep. Of these soil sites, 324 323 were re-surveyed between the first (1995–2008) and second (2009–13) survey periods. The remaining 96 sites were new sites, only surveyed at the second survey period. These survey sites represent around 90 percent of the area in each agricultural activity. The regions surveyed include Northland, Auckland, Waikato, Taranaki, Hawke’s Bay, Wellington, Tasman, Marlborough, and Canterbury (Mackay et al, 2013).

Reason for change: Terminology and numerical errors were as a result of miscommunication with data supplier.

Published 21 April 2017

Image, Marine domain.
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