graded on several factors
... that vineyards in the Douro are graded on several factors, such as microclimate and which grape varieties are planted, that can influence the potential quality of Port wine?
... that vineyards in the <a class="mw-redirect" href="./Douro_(wine)" id="mwAi4" rel="mw:WikiLink" title="Douro (wine)">Douro</a> <i id="mwAi8">(pictured)</i> are <b id="mwAjA"><a class="mw-redirect" href="./Quinta_classification_of_Port_vineyards_in_the_Douro" id="mwAjE" rel="mw:WikiLink" title="Quinta classification of Port vineyards in the Douro">graded on several factors</a></b>, such as <a class="mw-redirect" href="./Microclimate_(vine)" id="mwAjI" rel="mw:WikiLink" title="Microclimate (vine)">microclimate</a> and which <a class="mw-redirect" href="./Grape_varieties_(port)" id="mwAjM" rel="mw:WikiLink" title="Grape varieties (port)">grape varieties</a> are planted, that can influence the potential quality of <a href="./Port_wine" id="mwAjQ" rel="mw:WikiLink" title="Port wine">Port wine</a>?