Farmer grew crops without irrigation for 40 years

In a region grappling with escalating droughts and diminishing water resources, one Oregon farmer defied conventional wisdom by cultivating crops without irrigation for nearly four decades. This pioneering approach, known as dry farming, hinges on meticulous soil management to harness and sustain moisture essential for plant growth. The farmer's experiment, chronicled in a 2014 report by Oregon State University, spanned from 1974 to 2014.

Dry farming transcends the mere cessation of irrigation; it mandates soil preparation to maximize its natural ability to retain winter and spring moisture. This is achieved by cultivating the soil during early spring, leaving it undisturbed for several weeks, and then reworking it. This method fosters a seedbed capable of maintaining moisture around the roots. The soil composition plays a crucial role; the Oregon farmer's land, primarily Veneta loam with underlying clay layers, proved ideal for retaining water.

Initial trials were undertaken in California before the farmer relocated to a 9.6-acre plot near Veneta, Oregon, in 2007. Despite lacking water rights, he managed to sustain a diverse agricultural output for his family and small-scale sales in Eugene, featuring organic tomatoes, potatoes, winter squash, garlic, favas, and beans.

The key to his success lay in the soil's preparation. The farmer meticulously cultivated the soil during the optimal dry spell in spring, ensuring it was neither too wet nor too dry. He repeated this process to create an ideal seedbed. The soil's unique Veneta loam composition, coupled with deeper clay layers, naturally aided water retention. He also employed sheep, geese, and legume cover crops to enhance fertility and soil structure.

Once planting commenced, water conservation became paramount. The farmer ensured strong soil-to-seed contact by planting seeds directly into the soil and pressing them firmly. He maintained loose soil conditions around the plants for four to six inches, allowing roots to develop efficiently. This practice minimized soil compaction, which could otherwise hinder moisture absorption. Wider plant spacing further reduced competition for the scarce water and nutrients available.

The selection of crops played a pivotal role in his dry farming success. Tomatoes, potatoes, winter squash, garlic, and beans thrived on his land. He even cultivated heirloom varieties, such as a Big Beef tomato and a Blue Hokkaido squash, which were the result of years of careful selection and breeding. Some of these varieties showcased remarkable adaptability over successive growing seasons.

While dry farming may not be universally applicable—particularly in sandy or shallow soils with limited water-holding capacity—it offers a viable alternative for farmers facing water scarcity, uncertain water rights, or prohibitive irrigation costs. The Oregon farmer's 40-year experiment demonstrated that with diligent soil preparation, strategic crop selection, optimal spacing, and meticulous moisture management, water stored in the soil can sustain crops throughout an entire growing season, even in the face of diminishing water resources.