Legacy Phosphorus and Harmful Algal Blooms in Lake Erie
Legacy Phosphorus and Harmful Algal Blooms in Lake Erie
Legacy Phosphorus and Harmful Algal Blooms in Lake Erie
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<strong>Legacy</strong> P – How Much?<br />
More common to f<strong>in</strong>d budgets than <strong>in</strong>ventories…<br />
Soil Total P: ~1000 ppm or 2000 lb/acre or 2245 kg/ha*<br />
~4,000,000 tons <strong>in</strong> Maumee River watershed – <strong>in</strong> top 8 <strong>in</strong>ches!<br />
Compare soil test P (median S<strong>and</strong>usky watershed): 55 kg/ha<br />
Compare annual crop yield removal<br />
l ~11 kg/ha -> ratio is 200:1<br />
Compare annual tributary export<br />
l ~1.7 kg/ha -> ratio is 1350:1<br />
…Lots!<br />
But <strong>in</strong> many different forms<br />
* One source: http://www.soils.wisc.edu/extension/area/2003/Bundy_stp.pdf
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