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Poking holes in compacted soil lifted grain yields
The full reading behind my Short: a low-tech way to help crop roots get through compacted subsoil.
The short version
Researchers Elron Wiedermann, Miriam Athmann and Axel Don tested artificial macropores in compacted farmland at two sites in northern Germany [1]. They pushed 10 mm steel rods 80 cm into the ground by hand, making more than 12,000 pores, in winter wheat and (in the second year) winter barley [1]. On the loamy sand site, 100 pores per square metre raised grain yields by 9 to 15%; on the silt loam site by about 3% [1].
12,000+artificial pores made by hand [1]
80 cmpore depth, 10 mm wide [1]
+9–15%grain yield, loamy sand, 100 pores/m² [1]
~+91%subsoil root length density on average [1]
Why holes help
About 51% of German farm soils have compacted layers within the top metre, mostly 30 to 50 cm deep, which block roots from deeper water and nutrients [1]. The vertical pores gave roots ready-made channels; 86% of artificial pores were colonised by roots, versus 72% of natural biopores, and roots grew out 1 to 2 cm into the surrounding soil [1].
Gains were larger on the more compacted loamy sand and in the drier year, 2025 [1].
Watch the Short
About this page
The Short uses real, illustrative photos from Wikimedia Commons (credited below); they are not photos of the study itself. This page is general science news, not farming advice.
Why it matters, and what is still unknown
- Drought resilience. Subsoils can supply up to 65% of a crop's water; deeper roots may help in dry years [1].
- Soil carbon. More root biomass means more carbon going into subsoils [1].
- Open questions. The economics of installing pores, the best depth, and long-term effects still need work [1].
Full narration (transcript)
Bigger harvests, just by poking holes in the ground? Under many farm fields lies a hidden problem: compacted subsoil that roots struggle to break through. In Germany, about half of farm soils have compacted layers in the top metre. So researchers pushed steel rods, ten millimetres wide, eighty centimetres into the ground. By hand, they made more than twelve thousand artificial root channels. The trial ran for two years, at two sites in northern Germany, with wheat and barley. On the loamy sand site, a hundred pores per square metre raised grain yields by nine to fifteen percent. On the silt loam site, the gain was smaller, about three percent. In the subsoil, root length rose by about ninety percent on average, and roots spread into the soil around the pores. The gains were biggest on the more compacted soil, and in the drier year. Open questions remain, including the cost of making pores at scale. The study was published this week, in the journal Plant and Soil.
Sources
- [1] Wiedermann, E., Athmann, M. & Don, A. (2026). Artificial macropores increase crop productivity through improved root access to subsoils. Plant and Soil. doi:10.1007/s11104-026-09016-2. Summary: bioengineer.org (14 Oct 2026)
Credits
Photos (illustrative, Wikimedia Commons): Wheat field2 (th_norge, CC BY 4.0); The hard compacted soils prevent the roots of these wheat pl (USDA NRCS Texas, Public domain); A wheat field in Punjab, Pakistan (AishaSaleemkhan100, CC BY-SA 4.0); Torrertic Paleustoll (Fine, mixed, superactive, thermic) -- (Soil Science from Raleigh, CC BY 2.0); Pachic Paleustoll (fine, mixed, active, isohyperthermic) (51 (Soil Science from Raleigh, CC BY 2.0); Barley field 3 (Melsj, CC BY-SA 4.0); Barley field, Ehrenbach, detail (Gerda Arendt, CC0); Barley field, Ehrenbach (Gerda Arendt, CC BY-SA 4.0); The moist, loose soil in this field of no-till dryland wheat (USDA NRCS Texas, Public domain); CSIRO ScienceImage 607 Effects of Drought on the Soil (Atmospheric Research, CSIRO, CC BY 3.0); Field ploughing by tractor (abhiriksh, CC BY-SA 3.0); Vitoria-University-Library-food-science-journals-4489 (Vmenkov, CC BY-SA 3.0).