SoilPractitioner · 3 min readDraft — pending field review

Cover crops and living soil on the lakeshore

Keep the soil covered between vegetable cycles to stop erosion, feed the soil, and cut weeding.

Updated 9 June 2026

When a bed comes out of onions or vegetables, the common practice is to leave it bare until the next cycle. On the sandy soils near the Afram, that bare ground is working against you the whole time it rests.

Why bare soil near water erodes and bakes hard

Bare soil on the lakeshore takes punishment from two directions. When the rains come, water runs across the open surface and carries your lightest, richest topsoil down toward the lake. When the sun is hard, the same bare surface bakes, crusts over, and loses its moisture fast. Either way you lose the fertile top layer you have been working to build, and weeds move in to claim the empty ground. A cover crop is simply something living and useful kept growing on that ground so it is never left open and exposed.

Legumes and other covers for the area

Legumes are the family of plants that feed the soil with nitrogen. Working with bacteria on their roots, they pull nitrogen from the air and leave it in the soil for the next crop. That is nitrogen you would otherwise buy in a bag. Cowpea, groundnut, and mucuna are legumes well known to farmers in this part of Ghana and worth trialling between cycles. Where you want fast ground cover and a lot of organic matter rather than nitrogen, a grass-type cover or a quick-growing local green can hold the soil and smother weeds. Choose what is available locally and what your own neighbours have grown successfully; a cover crop that needs inputs you cannot get is no help.

Fitting a cover crop between cycles

The window is the gap between harvesting one vegetable crop and transplanting the next. Even a short fallow can carry a quick cover rather than sit bare. Where you have a longer rest, a legume has time to build real soil benefit before you turn it under.

As soon as a bed is harvested, prepare it lightly and sow your chosen cover thickly enough to close the ground and shade out weeds.

Let it grow with your normal irrigation. While it grows it is holding the soil, feeding the soil life, and saving you the weeding you would otherwise be doing on bare ground.

Terminate the cover before it sets hard seed and before your next crop is due. Cut it down and either work the green material into the topsoil or lay it on the surface as a mulch.

Give the residue a short time to begin breaking down, then transplant your onions or vegetables into the enriched, protected bed.

Field tip

Choose covers that earn their keep twice. Cowpea and groundnut give you food or sale value as well as soil benefit, and several legumes make good fodder for livestock. A cover that feeds the family or the goats while it feeds the soil is far easier to justify keeping in the rotation.

The dual benefit

A living cover does three paid jobs for free: it holds your topsoil so you are not rebuilding fertility you lost to a single rainstorm, a legume leaves nitrogen behind so you buy less, and the dense canopy suppresses weeds so you hire less labour and use less weedkiller. Each of those is money kept out of the input bill and away from the loan.

Keep living roots in the soil between seasons with a cover crop that holds the ground, feeds it, and smothers weeds.

Avoid

Leave beds bare and exposed between cycles, where rain washes off your topsoil and the sun bakes the surface hard.

Start by covering just the beds that come free first, learn how the cover fits your watering and your timing, and widen it as you gain confidence.

This guide is a working draft pending field review.