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An example of a dryland farming
paddock
Dryland farming is an
agricultural technique for non-irrigated
cultivation of land which receives little natural
rainfall.
Dryland farming is used in the Great Plains
, the Palouse plateau of
Eastern Washington, and other arid regions of North America, the
Middle East and in other grain growing
regions such as the steppes of Eurasia and
Argentina
. Dryland farming was introduced to the
southern Russian
Empire
by Russian
Mennonites under the influence of Johann Cornies, making the region the
breadbasket of Russia. Winter wheat is the typical crop although
skilled dryland farmers sometimes grow corn, beans or even
watermelons. Successful dryland farming is possible with as little
as of precipitation a year, but higher rainfall increases the
variety of crops which may be grown. Native American tribes in the
arid SouthWest subsisted for hundreds of years on dryland farming
in areas with less than of rain.
Dryland farming has evolved as a set of techniques and management
practices used by farmers to continually adapt to the presence or
lack of moisture in a given crop cycle. In marginal regions, a
farmer should be financially able to survive occasional crop
failures, perhaps of several years running . Survival as a dryland
farmer requires careful husbandry of the moisture available for the
crop and aggressive management of expenses in order to minimize
losses in poor years.
Dryland farming is uniquely dependent on natural rainfall, which
can leave the ground vulnerable to
dust
storms, particularly if poor farming techniques are used or if
the storms strike at a particularly vulnerable time. The fact that
a fallow period must be included in the crop rotation means that
fields cannot always be protected by a cover crop, which might
otherwise offer strong protection against erosion.
Key Elements of Dryland Farming
Capturing and Conservation of
Moisture - In regions such as Eastern Washington
state, the average precipitation available to a
dryland farm may be as little as . Because of this it must
be carefully safeguarded until the crop can utilize it. Techniques
for capturing the maximum amount of precipitation include using a
summer fallow rotation in which one
crop is grown on two seasons' precipitation, leaving standing
stubble or crop residue to trap moisture (particularly effective in
capturing wind-blown snow), and preventing runoff by
terracing fields. "Terracing" is also practiced by
farmers on a smaller scale by laying out the direction of furrows
to slow water runoff downhill, a practice known as
contour plowing. Moisture can be conserved
by eliminating weeds and leaving crop residue to shade the
soil.
Effective Use of Available Moisture - Once
moisture is available for the crop to use, it must be used as
effectively as possible. Seed depth and timing are carefully
considered in order to place the seed at a depth at which
sufficient moisture exists, or where it will exist when seasonal
precipitation falls. Farmers tend to use crop varieties which are
drought- and heat-stress tolerant, even if they may be lower
yielding. This increases the likelihood of a successful crop if the
seasonal precipitation ends sooner than normal.
Soil Conservation - The nature of dryland farming
makes it particularly susceptible to erosion, especially wind
erosion. Some of the techniques for conserving soil moisture, such
as frequent tillage to kill weeds, are at odds with techniques for
conserving topsoil. But since healthy
topsoil is critical to sustainable dryland
agriculture, its preservation is generally considered the most
important long term goal of a dryland farming operation and
conservation wins over moisture retention in those cases. Erosion
control techniques such as
windbreaks,
reduced tillage or
no-till, spreading straw on particularly susceptible
ground, and
strip farming are used to
minimize topsoil losses.
Control of Input Costs - Dryland farming is a
technique practiced in regions which are inherently marginally
suitable for non-irrigated agriculture. Because of this there is an
increased risk of crop failures and poor yields which may occur in
a dry year regardless of the amount of money or effort spent on the
crop by a farmer. Dryland farmers must evaluate the potential yield
of a crop constantly throughout the growing season and be prepared
to cut inputs to the crop such as fertilizer and weed control if it
appears that it is likely to have a poor yield due to insufficient
moisture. Conversely, in years in which moisture is in abundance,
farmers may increase their input efforts and budgets in order to
maximize yields and to help offset poorer harvests.
See also
Notes
External links
Further reading
- Henry Gilbert, Dryland Farming: January 1982-December
1990 (Beltsville, Md.: U.S. Department of Agriculture,
National Agricultural Library, 1991).
- Mary W. M. Hargraves, Dry Farming in the Northern Great
Plains: Years of Readjustment, 1920-1990 (Lawrence: University
of Kansas, 1993).
- Oklahoma State Board of Agriculture, Report (Guthrie, Okla.: N.
p., 1908).
- Dr. John A. Widstoe,Ph.D. Dry-Farming, A System Of
Agriculture For Countries Under A Low Rainfall (NY: The
MacMillian Company, 1911)