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Dryland farming

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Dryland farming refers to specific agricultural techniques used to grow crops without irrigation.

Camposcala
Camposcala

This method is essential for farming in drylands, which are areas with limited water resources. These regions typically experience a cool, wet season followed by a warm, dry season. The wet season is critical because it charges the soil with almost all the moisture available for the crops. Dryland farming is a way to adapt to these arid conditions and the challenges of climate change. It allows for the cultivation of important crops like maize and tomatoes in places where water is scarce.

To succeed, farmers must carefully manage the moisture available in the soil. They treat the moisture provided by winter rainfall as a "bank" of water for the plants. This process requires constant assessment of how much moisture is present during each crop cycle. Farmers must also practice aggressive management of their expenses to minimize financial losses. This is because they must be prepared for occasional crop failures that may last for several years. Success often depends on being aggressive during good years to offset the difficult dry years.

Several specific techniques are used to conserve and utilize soil moisture. One method is using wider than normal spacing between plants to provide a larger moisture bank for each one. Farmers also use controlled traffic and minimal tilling of the land to protect the soil. Strict weed control is necessary so that weeds do not consume the moisture needed by the cultivated plants. Some farmers use a practice called summer fallow rotation. In this method, a field is left with standing stubble or crop residue to help trap snow and moisture.

Palouse hills - 9591
Palouse hills - 9591

Farmers also use physical methods to prevent water runoff and soil erosion. Terracing involves shaping the land to slow down water as it moves downhill. This can be done on a large scale or by plowing along contours or keylines on a smaller scale. Another technique involves carefully considering seed planting depth and timing. Farmers place seeds at a depth where sufficient moisture exists or will exist when seasonal rain falls. They also select specific cultivars, or plant varieties, that are drought-tolerant and can handle heat stress.

Wheat Farm in Behbahan, Iran
Wheat Farm in Behbahan, Iran

History shows that some early theories of dryland farming were not actually scientific. In the late 19th and early 20th centuries, some people promoted "dust mulching." This idea claimed that tillage would seal in moisture, but testing showed it actually increased water loss through evaporation.

Large dust storm in parts of eastern Washington on October 4, 2009
Large dust storm in parts of eastern Washington on October 4, 2009

The book "Bad Land: An American Romance" describes how many smallholdings failed when people tried to farm in areas with very little rainfall. However, other historical movements were successful. Ukrainian Mennonites introduced dry farming to southern Russia and Ukraine under the influence of Johann Cornies. This helped transform that region into the breadbasket of Europe.

Dryland farming is practiced in many different environments across the globe. In the United States, it occurs in states such as Kansas, Nebraska, Washington, and Wyoming. It is common in the Great Plains and the Palouse plateau of Eastern Washington.

Palouse hills - 9591
Palouse hills - 9591

Other major regions include the Middle East, the steppes of Eurasia, Argentina, and Australia. In the United States, some areas like the Horse Heaven Hills in central Washington can be productive with an average annual rainfall of only 6 inches.

Heat affected crop during a green drought
Heat affected crop during a green drought

This shows that successful farming is possible even with very low precipitation.

Different crops are chosen based on when the rainfall occurs during the year. Winter wheat is well-suited for regions that receive higher winter rainfall. For areas with summer wet seasons, farmers might grow sorghum, sunflowers, or cotton.

Wheat Farm in Behbahan, Iran
Wheat Farm in Behbahan, Iran

Other common dryland crops include grapes, pumpkins, beans, corn, millet, and rye. Because these crops rely on stored winter water rather than growing-season rain, they are ideal for these environments. The choice of crop is a vital part of managing the risks of an arid climate.

Soil conservation is perhaps the most important long-term goal for any dryland operation. Because these farms rely on rainfall, they are very susceptible to wind erosion. If poor techniques are used, the ground can become vulnerable to large dust storms.

Large dust storm in parts of eastern Washington on October 4, 2009
Large dust storm in parts of eastern Washington on October 4, 2009

To protect the topsoil, farmers use windbreaks, reduced tillage, or strip farming. They may also spread straw or other mulch on ground that is particularly susceptible to erosion. Maintaining healthy topsoil is critical for making agriculture sustainable in arid zones.

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🖼️ Images & Media (5)
File:Camposcala.JPG
Camposcala.JPG
File:Large dust storm in parts of eastern Washington on October 4, 2009.jpg
Large dust storm in parts of eastern...
File:Wheat Farm in Behbahan, Iran.jpg
Wheat Farm in Behbahan, Iran.jpg
File:Palouse hills - 9591.jpg
Palouse hills - 9591.jpg
File:Heat affected crop during a green drought.jpg
Heat affected crop during a green drought.jpg
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