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30 September 2016

Lake Erie Algae Blooms Correlate to June Rainfall

June precipitation appears to be positively correlated to algae blooms in Lake Erie. Looking at monthly precipitation data readily-available from Weather Underground and comparing it to the Western Lake Erie Algae Bloom Severity Index, I was surprised by the strength of the correlation (0.6, 0.85 with an “outlier” removed). June precipitation was the only month to correlate to the Severity Index in my data set and I was surprised that …

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3 July 2016

Lake Erie Watershed Soil Phosphorus Study Shows Glyphosate Link

As reported recently by Laura Barrera in the┬ámagazine No-Till Farmer, a study led by Ohio Northern University chemistry professor Christopher Spiese links the popular herbicide glyphosate to dissolved reactive phosphorus (DRP) desorption in soils. Mobilization and runoff of phosphorus to streams and lakes is associated with toxic algae blooms in Lake Erie and the Gulf of Mexico Dead Zone. For decades, soil scientists have understood phosphorus to form low-solubility compounds …

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1 June 2016

Herbicides, Critical Source Areas, and Vegetated Buffers

Waging Chemical Warfare on Weeds Last fall, while on one of my country road walking routes, I noticed an advanced infestation of marestail (Conyza canadensis) in a soybean field. Evidently, this weed, and others, is becoming herbicide-resistant. A new agricultural herbicide called Acuron (link goes to manufacturer’s website) is on the market, and in some fields. Acuron has been developed in response to “superweeds” that have grown resistant to glyphosate, …

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20 November 2014

Update: American Farm Bureau Federation et al. v. EPA Oral Arguments

American Farm Bureau Federation, et al. v. EPA, Case 13-4079 oral arguments were held Tuesday (see previous post) and early indications suggest the Farm Bureau is fighting an uphill battle as it attempts to block the EPA from implementing a Total Maximum Daily Load (TMDL) program for Chesepeake Bay. The program calls for a 25% percent cut in nitrogen, 24% cut in phosphorus, and 20% reduction in sediment loads by …

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12 September 2011

Lake Erie Algae Bloom

This September 3, 2011 MODIS image of Lake Erie reveals a bright green algae plume concentrated in the western basin. The western basin of the lake is the shallowest part and receives discharge from the Maumee River, the largest river watershed in the Great Lakes with 6,354 square miles (16,460 square km) of land drainage. Land use in the watershed is about 85 percent agricultural and growers typically use a …

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16 May 2011

MODIS Reveals Major Sources of Sediment

It’s mud season in the Midwest and the MODerate Imaging Spectroradiometer (MODIS) 250m true color band beautifully displays the tell-tale sediment plumes entering western Lake Erie (left). Updates of Great Lakes MODIS imagery are available here MODIS is a multi-band imaging instrument mounted on two Earth-orbiting satellites, the Terra, and the Aqua, both part of the NASA-led international Earth Observing System. Between the two of them, the entire Earth is …

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