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<meta property="og:title" content="Normalisation factors for aerobic soil degradation according to FOCUS guidance — f_time_norm_focus" />
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in Appendix 8 to the FOCUS kinetics guidance (FOCUS 2014, p. 369)." />


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    <h1>Normalisation factors for aerobic soil degradation according to FOCUS guidance</h1>
    <small class="dont-index">Source: <a href='https://github.com/jranke/mkin/blob/master/R/f_time_norm_focus.R'><code>R/f_time_norm_focus.R</code></a></small>
    <div class="hidden name"><code>f_time_norm_focus.Rd</code></div>
    </div>

    <div class="ref-description">
    <p>Time step normalisation factors for aerobic soil degradation as described
in Appendix 8 to the FOCUS kinetics guidance (FOCUS 2014, p. 369).</p>
    </div>

    <pre class="usage"><span class='fu'>f_time_norm_focus</span><span class='op'>(</span><span class='va'>object</span>, <span class='va'>...</span><span class='op'>)</span>

<span class='co'># S3 method for numeric</span>
<span class='fu'>f_time_norm_focus</span><span class='op'>(</span>
  <span class='va'>object</span>,
  moisture <span class='op'>=</span> <span class='cn'>NA</span>,
  field_moisture <span class='op'>=</span> <span class='cn'>NA</span>,
  temperature <span class='op'>=</span> <span class='va'>object</span>,
  Q10 <span class='op'>=</span> <span class='fl'>2.58</span>,
  walker <span class='op'>=</span> <span class='fl'>0.7</span>,
  f_na <span class='op'>=</span> <span class='cn'>NA</span>,
  <span class='va'>...</span>
<span class='op'>)</span>

<span class='co'># S3 method for mkindsg</span>
<span class='fu'>f_time_norm_focus</span><span class='op'>(</span>
  <span class='va'>object</span>,
  study_moisture_ref_source <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='st'>"auto"</span>, <span class='st'>"meta"</span>, <span class='st'>"focus"</span><span class='op'>)</span>,
  Q10 <span class='op'>=</span> <span class='fl'>2.58</span>,
  walker <span class='op'>=</span> <span class='fl'>0.7</span>,
  f_na <span class='op'>=</span> <span class='cn'>NA</span>,
  <span class='va'>...</span>
<span class='op'>)</span></pre>

    <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
    <table class="ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>object</th>
      <td><p>An object containing information used for the calculations</p></td>
    </tr>
    <tr>
      <th>...</th>
      <td><p>Currently not used</p></td>
    </tr>
    <tr>
      <th>moisture</th>
      <td><p>Numeric vector of moisture contents in \% w/w</p></td>
    </tr>
    <tr>
      <th>field_moisture</th>
      <td><p>Numeric vector of moisture contents at field capacity
(pF2) in \% w/w</p></td>
    </tr>
    <tr>
      <th>temperature</th>
      <td><p>Numeric vector of temperatures in °C</p></td>
    </tr>
    <tr>
      <th>Q10</th>
      <td><p>The Q10 value used for temperature normalisation</p></td>
    </tr>
    <tr>
      <th>walker</th>
      <td><p>The Walker exponent used for moisture normalisation</p></td>
    </tr>
    <tr>
      <th>f_na</th>
      <td><p>The factor to use for NA values. If set to NA, only factors
for complete cases will be returned.</p></td>
    </tr>
    <tr>
      <th>study_moisture_ref_source</th>
      <td><p>Source for the reference value
used to calculate the study moisture. If 'auto', preference is given
to a reference moisture given in the meta information, otherwise
the focus soil moisture for the soil class is used</p></td>
    </tr>
    </table>

    <h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2>

    <p>FOCUS (2006) &#8220;Guidance Document on Estimating Persistence
and Degradation Kinetics from Environmental Fate Studies on Pesticides in
EU Registration&#8221; Report of the FOCUS Work Group on Degradation Kinetics,
EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
<a href='http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics'>http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics</a>
FOCUS (2014) &#8220;Generic guidance for Estimating Persistence
and Degradation Kinetics from Environmental Fate Studies on Pesticides in
EU Registration&#8221; Report of the FOCUS Work Group on Degradation Kinetics,
Version 1.1, 18 December 2014
<a href='http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics'>http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics</a></p>
    <h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>

    <div class='dont-index'><p><a href='focus_soil_moisture.html'>focus_soil_moisture</a></p></div>

    <h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
    <pre class="examples"><div class='input'><span class='fu'>f_time_norm_focus</span><span class='op'>(</span><span class='fl'>25</span>, <span class='fl'>20</span>, <span class='fl'>25</span><span class='op'>)</span> <span class='co'># 1.37, compare FOCUS 2014 p. 184</span>
</div><div class='output co'>#&gt; [1] 1.373956</div><div class='input'>
<span class='va'>D24_2014</span><span class='op'>$</span><span class='va'>meta</span>
</div><div class='output co'>#&gt;                                 study usda_soil_type study_moisture_ref_type
#&gt; Mississippi                Cohen 1991      Silt loam                    &lt;NA&gt;
#&gt; Fayette     Liu and Adelfinskaya 2011      Silt loam                     pF1
#&gt; RefSol 03-G Liu and Adelfinskaya 2011           Loam                     pF1
#&gt; Site E1     Liu and Adelfinskaya 2011           Loam                     pF1
#&gt; Site I2     Liu and Adelfinskaya 2011     Loamy sand                     pF1
#&gt;             rel_moisture temperature
#&gt; Mississippi           NA          25
#&gt; Fayette              0.5          20
#&gt; RefSol 03-G          0.5          20
#&gt; Site E1              0.5          20
#&gt; Site I2              0.5          20</div><div class='input'><span class='co'># No moisture normalisation in the first dataset, so we use f_na = 1 to get</span>
<span class='co'># temperature only normalisation as in the EU evaluation</span>
<span class='fu'>f_time_norm_focus</span><span class='op'>(</span><span class='va'>D24_2014</span>, study_moisture_ref_source <span class='op'>=</span> <span class='st'>"focus"</span>, f_na <span class='op'>=</span> <span class='fl'>1</span><span class='op'>)</span>
</div><div class='output co'>#&gt; $time_norm was set to
#&gt; [1] 1.6062378 0.7118732 0.7156063 0.7156063 0.8977124</div></pre>
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