Among today's top stories a newly published study on how fertilizing with manure affects soil quality, compared with inorganic fertiliser. Ekrem Ozlu of the University of Wisconsin-Madison and his team studied two fields in South Dakota. From 2003 to 2015, the research team applied either manure or inorganic fertilizer to field plots growing corn and soybeans. They used low, medium, and high manure levels, and medium and high inorganic fertilizer levels. They also had a control treatment of no soil additives to provide a comparison.In the summer of 2015, they collected soil samples at a variety of depths using a push probe auger. Then they analyzed the samples.

Manure helped keep soil pH in a healthy range for crops. Inorganic fertilizer made the soil more acidic.

Manure increased soil organic carbon for all the measured soil depths compared to inorganic fertilizer and control treatments. More carbon means better soil structure.

Manure significantly increased total nitrogen compared to fertilizer treatments. Nitrogen is key to plant growth.

Manure increased water-stable aggregates. These are groups of soil particles that stick to each other. Increased water-stable aggregates help soil resist water erosion. Inorganic fertilizer application decreased these aggregates.

Manure increased soil electrical conductivity at all soil depths in comparison to inorganic fertilizer and control treatments. Higher soil electrical conductivity means higher salt levels in the soil.

Ozlu and his team concluded that long-term annual application of manure improved most soil quality properties compared to inorganic fertilizer.

Here in Costa Rica it is another sunny day, we have a light westerly breeze with 30 centigrade and 68% humidity. How are conditions in your part of the planet? Comment below, including your location. It is always great to hear the local perspectives from our global community.

Today's Featured Links:
Physics Problems: https://www.cfa.harvard.edu/news/2018-20
Solar Fields: https://arxiv.org/pdf/1811.00461.pdf
FRB Paper: https://arxiv.org/pdf/1811.00360.pdf
Goodnight DAWN: https://www.jpl.nasa.gov/news/news.ph...
Soil: https://www.agronomy.org/science-news...
Water Fracking & Earthquakes: http://www.jsg.utexas.edu/news/2018/1...
RF Cancer: https://www.niehs.nih.gov/news/newsro...

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