|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
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 definition
The A Horizon in Rules and Regulations