Farming with row patterns that run almost level around the hill, not up and down the hill, is called Contour farming.
Fremont, CA: Decades of tillage and an absence of cover cropping have caused serious harm to the world’s hillside cropland and its soil structures, creating an urgent need to explore alternative cultivation methods, such as those used in contour farming.
There are huge benefits of contour farming that far outweigh its perceived difficulty. So before planting your next row crop on some hilly terrain, consider these four benefits of contour farming:
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1. Prevents soil erosion
Typical farming practices cultivate along straight, long, and even slopes parallel to the flow of water accelerates the erosion rate when it rains because all of the water flows straight downhill.
This usually results in the soil being “washed away” along with the crop.
Farming across slopes—perpendicular to the flow of water, conversely, acts like a barrier, which helps slow down runoff water, allowing it to soak into the soil completely.
Contour farming can also decrease soil erosion by as much as 50% compared to farming up and down hills, according to the Natural Resources Conservation Service. The agency also notes that since contour farming reduces water runoff, it controls the number of twigs, pebbles, sand, and other debris, resulting in better water quality.
2. Improves water irrigation
Farmers can further aid slow down water flow during rainy seasons by digging a hillside ditch or swaling across a slope.
In the contour lines workshop, participants will learn how to design both “true on contour” swales, which catch and hold water across the landscape, as well as slightly “off-contour” swales, which slowly move water from one location to another, while still enabling the water to sink in slowly. These off-contour swales help increase soil moisture and prevent excessive surface water impedes equipment access to fields.
3. Boosts nutrients
The unsung hero of contour farming is increased soil fertility. In a contoured design, a farmer can plant different crops on different strips and alternate them depending on the nutritional needs of each type of crop.
For example, legumes can be alternated with corn, so the corn can use nitrogen that the legumes leave in the soil.
The increased soil moisture from swales also promotes biological activity in the soil, which releases additional nutrients to plants. In the contour lines workshop, participants will discuss examples of how swales on contour have opened up heavy clay soil into a more porous and fertile structure conducive to various crops.
4. Increases yields
Reducing runoff, soil erosion, and increasing fertility are all key benefits of contour farming, yet the practice has also shown increases in crop yields. In a recent study by the Soil Conservation Service and the University of Nebraska, the majority of farmers surveyed reported a 5-10% increase in yields by retaining moisture and sharing nutrients in the soil.
The study also found that when farmers used contour farming methods under ideal conditions, such as on slopes with gradients between 2% and 10% and precipitation rates under 6.5 inches per year, their yields increased by up to 50%.