 |
|
|
| Impact of Expanding the A horizon definition |
| Author: Bob Graham Created on: 8/29/2012 MessageID: 1546 |
| The proposal to expand the definition of the A horizon was written in response to the proposal for a master horizon to designate vesicular horizons. As such, it may be viewed as simply providing an alternative to the new horizon. In fact, its impact would be much farther-reaching than this. The current USDA definition of the A horizon emphasizes the genetic process of accumulation of humified organic matter within a mineral soil horizon. This is the classic definition of the A horizon and the one presented in hundreds of dictionary and encyclopedia definitions and in textbooks for elementary school to university level classes. Expanding the definition of the A horizon obscures the genetic information transmitted with the label. The A horizon is also written into a variety of legal regulations, including those related to reclamation of surface mined lands, septic systems, and wetlands. These regulations are at the national level, the state level, and perhaps even at the more local levels. To determine the effect of the proposed expanded A horizon definition on these regulations would be a major undertaking, yet ignoring them could have serious consequences. Redefining the A horizon will complicate communication with the public and may have serious legal implications. There is a clean alternative: Retain the current definition of the A horizon and add the V horizon for the distinct and important vesicular horizon. |
Total messages in this thread... 3 Impact of Expanding the A horizon definition (current) Response to Impact of expanding the A horizon definitionThe A Horizon in Rules and Regulations |
 Return to top of page USDA-NRCS Soils SiteThis site provided as a service of Virginia Polytechnic Institute and State University |