In a newly published study, researchers dug into how fertilizing with manure affects soil quality, compared with inorganic fertilizer.
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—a measure of acidity or alkalinity—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.
Is it time to re-purpose the world's sewage into fertilizer?
(Score: 3, Interesting) by Phoenix666 on Thursday November 01 2018, @12:57PM
I've posted this many times before, but terra preta [wikipedia.org] that the Amazonian Indians created is much more fertile than the artificial fertilizers. Since it was discovered to be man-made, scientists have been trying to re-create it. Human and animal excrement are components in it.
I have read before that soil scientists who studied the stuff created by pre-Columbian people in the Amazon basin calculated they could get an 880% boost in crop yields [naturalbuildingblog.com]. Can you imagine getting 880% more out of the patch of land you're farming?
Washington DC delenda est.