Minimum soil disturbance is one of the main tenets of conservation agriculture, and with good reason. Soil is one of the most important assets that farmers have, and practicing no-till or minimum-till planting can go a long way toward protecting it.
Tilling the soil and exposing it to the elements creates numerous risks. Exposed soil is more prone to drying out – water evaporates off of it more quickly and can create challenges for farmers especially in times of drought. In addition, plowing can destroy soil structure and lead to more rapid decomposition of organic matter, essentially killing off soil life. Finally, plowing also loosens up the soil, creating increased risks for erosion – which is a particularly serious issue in Rwanda, where crops are often planted on steep hillsides and sloping land.
So how can farmers minimize soil disturbance when planting their crops? There are two primary methods:
- No-till planting. This involves planting crops directly into mulch or crop residues left in the field from the previous season, without plowing the land. Farmers can use a number of techniques to do this, such as by drilling seeds into the ground using specialized equipment. Smallholder farmers may also plant seeds into the ground by hand.
- Minimum till planting: Farmers can use various methods to minimally till their land while planting, without fully turning over the soil. This may involve making thin strips in the land where seeds can be planted and then covered with soil and a layer of mulch. Farmers may also plant crops at shallower depths to avoid deeply disturbing the soil. For instance, RICA conservation agriculture experts generally recommend that Rwandan farmers plant grain and legume seeds no more than 5 centimeters deep in their soil.
Practicing no-till and minimum-till planting can have long-term benefits for Rwanda’s soil, ensuring farms remain healthy and productive for generations to come.