|
Contour conservation practices
are established by laying a level line across the contour of a slope
and are effective in reducing water runoff down the slope on cropland.
Buffer strips
are narrow strips of a permanent vegetative cover planted across
a slope and alternating down the slope. This practice is most effective
on gentle slopes of 4-8 percent. The area between the narrow vegetative
strips is planted to a crop. Contour
farming is the tilling, planting and normal
operation of all farming practices following the contour of the field
slope. Contour farming is most effective on slopes of 2-10 percent.
Stripcropping
is growing row crops, forages, small grains or fallow in an alternating
arrangement of equal strips planted on the contour of the field slope.
All of the contour practices are effective in reducing sheet
and rill erosion, and preventing sediment and contaminants from leaving
the field. Wildlife also benefit from the use of contour buffer strips.
Crosswind practices
are used on cropland to reduce the potential for erosion from wind.
Wind ridges
are formed by tillage or planting crops aligned across the direction
of the prevailing wind. This practice is most effective on sandy loams
and soils with high clay and silt content. Soils with a high content
of sand are not adapted to this practice. Stripcropping
is growing crops in strips established across the direction of the prevailing
wind. Crops are alternated to provide protective cover that is resistant
to wind erosion. Trap
Strips are strips of herbaceous cover established across the
direction of the prevailing wind. The trap strips also provide food
and cover for wildlife. Crosswind practices are effective in reducing
erosion from wind. The practices will also protect crops from damage
caused by blowing soil and debris.
Filter
Strips are areas of vegetation established for removing sediment,
organic
matter and pollutants from cropland runoff. This practice is commonly
used at the lower edge of cropland adjacent to ponds, lakes and streams.
Sediment and other pollutants are filtered from runoff in the strips
and reduce pollution and protect the environment.
Grade
stabilization structures primarily reduce water erosion in natural
and artificial channels. The earthen structures trap sediment and pollutants
carried in runoff from cropland. This practice is effective in preventing
gully erosion where water washes deep channels into the soil.
Irrigation
water management is controlling the rate, amount, and timing
of application of irrigation water in an efficient manner. This practice
is effective in minimizing soil erosion and loss of plant nutrients.
It will also prevent water loss and protect water quality. The farmer
must monitor the rate that water is applied and know the water requirements
of the plants and the absorption rate of the soil to prevent erosion
from runoff.
Riparian
forest buffers are areas of trees and shrubs planted adjacent
to a body of water.
The purpose of this practice is the reduce excess amounts of sediment,
organic material, nutrients, pesticides and other pollutants in surface
runoff and other chemicals that may leach into shallow groundwater flow
areas from cropland. This practice also provides a source of food and
cover for wildlife.
Soil
salinity management on non-irrigated cropland manages the land,
water and plants to control harmful accumulations of salts on the soil
surface or in the plant root zone. Saline seeps are commonly found in
discharge and recharge areas and can be detected by a salt crusting
on the soil surface. This practice is used to permit desired plant growth
and protect surface and groundwater resources.
Terraces
are an earthen embankment, a channel or a combination ridge and channel
constructed across the slope. Terraces will reduce the length of the
slope, reduce erosion and runoff, improve water quality and prevent
the development of gullies. When properly installed farming on terraces
can increase crop yields by conserving moisture instead of allowing
the water to run down the slope.
Windbreak/shelterbelt
establishment is placing single or multiple rows of trees
commonly called field windbreaks to protect cropland. Windbreaks will
reduce wind erosion, manage snow, and protect tender plants from damage
of air borne soil and other particles. All species planted must be suited
to the soils and conditions of the area to be protected.
Photos
courtesy USDA NRCS
|