Chemical Properties
Reactive Carbon
Slaking is the breakdown of large, air-dry soil aggregates (>2-5 mm) into smaller sized microaggregates (<0.25 mm) when they are suddenly immersed in water. Slaking occurs when aggregates are not strong enough to withstand internal stresses caused by rapid water uptake. Internal stresses result from differential swelling of clay particles, trapped and escaping air in soil pores, rapid release of heat during wetting, and the mechanical action of moving water.
Soil Electrical Conductivity
Soil electrical conductivity (EC) measures the ability of soil water to carry electrical current. Electrical conductivity is an electrolytic process that takes place principally through water-filled pores. Cations (Ca2+, Mg2+, K+, Na+, and NH4 +) and anions (SO4 2-, Cl-, NO3 -, and HCO3 -) from salts dissolved in soil water carry electrical charges and conduct the electrical current.
Soil Nitrate
Nitrate (NO3 -) is a form of inorganic nitrogen (N) naturally occurring in soils. Sources of soil NO3 – include decomposing plant residues and animal manure/compost, chemical fertilizers, exudates from living plants, rainfall, and lightning.
Soil pH
Soil pH generally refers to the degree of soil acidity or alkalinity. Chemically, it is defined as the log10 hydrogen ions (H+) in the soil solution. The pH scale ranges from 0 to 14; a pH of 7 is considered neutral. If pH values are greater than 7, the solution is considered basic or alkaline; if they are below 7, the solution is acidic.
2024 Soil Health Conference Registration Open!
The 2024 Soil Health School will be held Jan. 23-24 at the Best Western Ramkota Hotel in Rapid City, SD! Keynote speakers include Jay Fuhrer, Jerry Hatfield, Glenn Elzinga, and Zach Smith. There will be many other speakers, breakout sessions, and opportunties to network and socialize! Join us and be a part of our 2024 Soil Health Conference!
News & Events
Wintertime is decision time
By Stan Wise PIERRE, SD – It’s often said that the best time to start improving your land was 20 years ago, but the second-best time is right now. That statement might be harder for ranchers to swallow with winter on their doorstep, nothing growing in their pastures,...
Research ties healthy soil biology to a host of benefits
By Stan Wise PIERRE, SD – Agricultural producers often base their land management decisions on the living things they can see above the ground – crops, livestock, forage, weeds, insects, wildlife, etc. However, new research is showing they should also consider life...
Student video and essay contests now open
As part of the 2024 Soil Health Conference, the South Dakota Soil Health Coalition has announced two exciting contests for students in South Dakota. The student video and essay contests have been designed to give students the opportunity to learn more about soil...