The soil-rated themes discussed in this paper are: soil acidity, wind erosion, water erosion
, soil organic carbon, soil compaction, water repellence, and nutrient status (phosphorus).
This model estimates tillage erosion using a diffusion equation and water erosion
using a modified version of the Revised Universal Soil Loss Equation (RUSLE).
rates were calculated as the difference between net erosion and tillage erosion.
The average soil loss to water erosion
on cropland is thought to be 3.1 tons per acre per year, close to the limit.
This suggests that benefit-ranking would achieve a much higher proportion of potential environmental benefits than would enrolling land on the basis of cost, particularly for water erosion
and groundwater vulnerability because they are positively correlated with cost.
The increased awareness of erosion impacts on air and water quality and on global climate change raise new challenges for erosion researchers in three key areas: wind erosion, water erosion
, and quantification of erosion.
High magnitude, low frequency wind and water erosion
events have also been studied (Painter 1978; Hunter and Lynn 1988, 1990; Basher 1990).
A hypertext program to provide information about soil erosion with emphasis on water erosion
. Information is provided about the severity of erosion worldwide, in the U.S.
Baker of the University of Arizona in Tucson compared the nature of valleys - features carved by water erosion
over hundreds of thousands of years on Earth and Mars.
However, if more accurate quantification of soil erosion is required or there is a further need to distinguish between water erosion
and tillage erosion, it is necessary to use the mass balance model to convert [sup.137]Cs data to total erosion rates (Li et al.
According to estimates of the Environment Ministry, almost one fourth land area, which is suitable for intensive agriculture, is seriously under threat to wind and water erosion
, salinity and sodicity, water-logging, flooding and loss of organic matter.