Frankia alni
... that alder trees have a symbiotic relationship with the bacterium Frankia alni which may have been exploited by the Incas to increase soil fertility?
... that <a href="./Alder" id="mwBzs" rel="mw:WikiLink" title="Alder">alder</a> trees have a <a href="./Symbiosis" id="mwBzw" rel="mw:WikiLink" title="Symbiosis">symbiotic</a> relationship with the <a href="./Bacteria" id="mwBz0" rel="mw:WikiLink" title="Bacteria">bacterium</a> <i id="mwBz4"><b id="mwBz8"><a href="./Frankia_alni" id="mwB0A" rel="mw:WikiLink" title="Frankia alni">Frankia alni</a></b></i> which may have been exploited by the <a class="mw-redirect" href="./Inca_civilization" id="mwB0E" rel="mw:WikiLink" title="Inca civilization">Incas</a> to increase <a class="mw-redirect" href="./Fertility_(soil)" id="mwB0I" rel="mw:WikiLink" title="Fertility (soil)">soil fertility</a>?