Berry and Jackson wrote, " We need a 50-year farm bill that addresses forthrightly the problems of soil loss and degradation, toxic pollution, fossil-fuel dependency and the destruction of rural communities ."
32.
In the US, sampling for erosion estimates by the US NRCS ( Natural Resources Conservation Service ) is statistically based, and estimation uses the Universal Soil Loss Equation and Wind Erosion Equation.
33.
"' Drainage "'is the equilibrium soil-to-geosynthetic system that allows for adequate liquid flow without soil loss, within the plane of the geosynthetic over a service lifetime compatible with the application under consideration.
34.
When tunnelling in soft ground it is expected that the tunnel will sag due to soil loss ( sagging of the soil after tunnelling or mining operations ) which cannot be avoided completely.
35.
"We're seeing a lot of vegetation loss and a lot of soil loss, " she said, citing as an example Capitol Peak, where climbers have created trails that turned into gullies and rerouted a creek.
36.
Consistent with the Off-Highway Motor Vehicle Act of 1988, the condition of soils, wildlife and vegetative resources are continually monitored by park staff to determine if soil loss standards and habitat protection plans are being met.
37.
According to the United States Department of Agriculture's National Resource Conservation Service, in 2007 in the US, 99 million acres ( 28 % of all cropland ) were eroding above soil loss tolerance ( T ) rates.
38.
The United States Department of Agriculture defines the "'T Value "'as the maximum average soil loss ( in tons per year ) that will still allow economical maintenance of the current level of production into the future.
39.
"' Soil loss tolerance "'for a specific soil, also known as the "'T value "', is the maximum average annual soil loss expressed as tons per acre per year that will permit current production levels to be maintained economically and indefinitely.
40.
"' Soil loss tolerance "'for a specific soil, also known as the "'T value "', is the maximum average annual soil loss expressed as tons per acre per year that will permit current production levels to be maintained economically and indefinitely.
