Field preparation and planting using minimal tillage methods. A key and the first of the principles of Conservation Agriculture, this practice supports healthy soils by improving water infiltration, preventing erosion, and sustaining microorganisms. (Photo Courtesy: RICA)
Conservation Agriculture (CA) is a farming system that sustainably improves productivity, enhances biodiversity, and protects natural resources through soil health. CA first principle is to minimize the soil disturbance. It encourages farmers to work with nature, not against it by protecting the soil and allowing it to restore itself. When soil is treated gently, it becomes healthier, more productive, and more resilient to climate stress. By disturbing the soil as little as possible, farmers allow the same soil to rebuild its natural strength.
Why minimizing soil disturbance matters?
Healthy soil is the foundation of good farming. Frequent ploughing breaks the soil into weak pieces, destroys earthworm tunnels, and closes the small spaces in the soil where water and air should move. When we disturb the soil less, it stays loose and well-structured, allowing water to easily infiltrate, reducing runoff and erosion, and enabling the soil to retain more moisture for longer periods, particularly during dry spells.
Less tillage also helps keep soil organic matter, because it does not break down quickly. This improves nutrients in the soil and supports helpful microorganisms. Over time, the soil becomes healthier and stronger, and crops grow better with fewer inputs. It also saves labor cost, reduces soil compaction from repeated passes, and helps store carbon, making farming more sustainable. In summary by reducing soil disturbance, farmers:
- Increase soil fertility and organic matter
- Improve water retention and drought resilience
- Reduce erosion and nutrient loss
- Protect soil organisms such as earthworms and beneficial microbes that help release nutrients to crops
- Achieve more stable and often higher crop yields
Agricultural best practices for minimal soil disturbance
Minimal soil disturbance is built on farming practices that help to maintain soil integrity. This means avoiding ploughing and preserving the soil structure as natural as possible. On previously used land, farmers can practice no-tillage by planting directly into the soil without turning it. Where weeds are a challenge, herbicides may be used before planting or after crop emergence, to reduce the need for hoeing and repeated cultivation.
Weed control can also be achieved by slashing or rolling weeds before they flower and leaving them on the surface. This forms a mulch layer that protects the soil and suppresses subsequent weed growth. Farmers can then plant directly into mulch, placing cereal and legume seeds through crop residues to keep the soil cooler, reduce erosion and conserve moisture.
For crops like cassava and sweet potatoes, the use of planting basins or half-moons allows for the preparation of only small spots while leaving the surrounding soil undisturbed. Zonal ripping loosens narrow strips to break through hard layers without ploughing the whole field, which improves infiltration and root growth. Moreover, when opening new or long-fallow land, clearing should be done with minimal soil disturbance. For manual weeding, hula hoes cut weeds at the surface without turning the soil.
Rwanda Red Cross staff and sector, district agronomists from Nyamasheke and Rutsiro districts during a 3-day deep dive workshop at RICA Campus on best practices in land preparation and planting, emphasizing Conservation Agriculture’s first principle: Minimal Tillage (Photo Courtesy: RICA).
Voices from the Field: How Minimum Tillage is Transforming Early Adopters’ Farms”
From Gakenke to Kirehe, smallholder farmers are proving that conservation agriculture, especially minimal tillage paired with other CA principles, turns modest plots into resilient, high performing fields.
“I would harvest 50 kg of maize on this small plot of 100 square meter under conventional till. After adopting Conservation Agriculture methods, including minimal tillage, I now expect 120kgs from the same plot” – Baziramwabo Leonard | Muyongwe Sector, Gakenke District.
“Before, I was unable to harvest maize. However, since I began using conservation agriculture (CA), my productivity has doubled from 20 kg to 40 kg on this small plot you see here. Land preparation is now more affordable. I spend only 2,500 Frws on my small plots instead of the previous 8,000 Frws when I used conventional tillage, saving almost 70% in labor costs.” – Mukatwizerimana Jeanne | Gatore Sector, Kirehe District.
Healthy soil means healthy crops
The above farmers’ testimonies point to healthier soils, stronger structure, and better moisture retention, gains that translate into reliable productivity and inspire peer adoption. These voices trace a clear arc: less disturbance mean lower costs, richer soils, and more food on the table. By minimizing soil disturbance, farmers invest in their land’s future, making it more productive, resilient to climate change, and sustainable for generations to come. It reminds us that sometimes, doing less to the soil allows it to do more for us.
