Intercropping maize with cassava can help a farmer use land more efficiently, spread production risk and harvest two important crops from the same field. But it only works well when the crops are planted and managed so that one does not badly suppress the other.
In Nigeria and other parts of West Africa, cassava is commonly grown with maize. FAO reviews of African cassava systems identify cassava: maize as one of the most common cassava intercrops. The important point is that there is no single spacing, planting date or fertiliser programme that fits every farm. Variety, rainfall, soil fertility, field history and the farmer’s main target crop all matter.
What is maize: cassava intercropping?
Intercropping means growing two or more crops on the same field during at least part of their growth period. In a maize: cassava system, the maize usually grows and matures faster, while cassava stays in the field longer.
This difference in growth pattern is one reason the combination can work. Maize can give an earlier harvest while cassava continues developing after the maize is removed.
Why farmers intercrop maize with cassava
- Better use of land: two crops share the same field during part of the season.
- More than one harvest: maize provides an earlier crop while cassava remains for a later harvest.
- Risk spreading: if one crop performs poorly, the second crop may still provide food or income.
- Ground cover: mixed cropping can help keep more of the soil surface covered than poorly managed bare land.
- Labour planning: farmers can combine operations where practical instead of managing two completely separate fields.
These are potential advantages, not automatic guarantees. Poor spacing, late weeding, low soil fertility or severe moisture stress can reduce the performance of one or both crops.
Which crop should be the priority?
Before planting, decide whether maize, cassava or the combined harvest is your main target. That decision affects plant population, timing and how aggressively you manage competition between the crops.
If maize is your main cash crop, too much cassava competition early in the season can reduce maize performance. If cassava is the priority, an overly dense maize stand can shade young cassava and compete for water and nutrients.
This is why copying a neighbour’s spacing without considering varieties and local conditions can give poor results.
Planting time: avoid rigid rules
Cassava is flexible compared with many annual crops, but it still needs enough soil moisture to establish properly. FAO notes that cassava planting time in West Africa is strongly influenced by the rainy season and local moisture conditions.
Maize and cassava may be planted together or at different times depending on the production system. The safest approach is to use recommendations from your local extension service, research station or experienced agronomist for your agro ecological zone rather than relying on one fixed number of days or weeks for every farm.
Spacing and plant population
There is no universal cassava: maize spacing that is correct everywhere. FAO reports wide variation in cassava plant density across African farms because branching habit, soil fertility, rainfall, cropping pattern and farmer objectives differ.
IITA’s cassava agronomy work in Nigeria also treats cassava: maize recommendations as something that should be adapted to the local field rather than reduced to one national formula.
As a practical rule, leave enough room for both crops to receive light, water and nutrients. Avoid planting both at full sole crop density unless a locally tested recommendation specifically supports it.
Soil fertility still matters
Intercropping does not make fertiliser or soil management unnecessary. Both maize and cassava remove nutrients from the soil. A mixed field can still become less productive when nutrients removed at harvest are not replaced.
Start with the field’s condition. Where possible, use a soil test and local extension recommendations to guide fertiliser or manure use. Avoid assuming that cassava will automatically “put nutrients back” into the soil; cassava is not a legume.
Weed control in a maize: cassava field
Early weed control is important because young maize and cassava can both lose yield when weeds compete strongly for light, water and nutrients.
Weed management options depend on the weeds present, the crop stage and which herbicides are legally registered and safe for the particular cropping system. Do not assume that a herbicide that is safe in sole maize is automatically safe in a maize: cassava intercrop.
Use label directions and local professional advice. Mechanical or manual weeding may also be part of the programme, especially where herbicide choices are limited.
Main problems to watch for
- Too much competition: high plant populations can reduce light, water and nutrient availability.
- Shading: crop variety and planting arrangement affect which crop shades the other.
- Delayed weeding: weeds competing with two crops can quickly reduce the benefit of intercropping.
- Poor soil fertility: two crops cannot compensate for severely depleted soil.
- Difficult spraying: chemical weed or pest control becomes more complicated when two crops with different tolerances occupy the same field.
- Harvest interference: maize harvesting and movement through the field should not unnecessarily damage cassava plants.
Can intercropping increase yield?
It can improve total land productivity, but it is misleading to promise that maize or cassava yield will always rise by a fixed percentage. Sometimes the yield of one crop per hectare is lower than when that crop is grown alone, while the combined value of both crops makes better use of the land.
That is why farmers should record both crops separately: maize yield, cassava yield, labour, fertiliser, weed control cost and selling price. The system is successful when the combined farm result makes sense: not simply because two crops are present.
Simple field checklist
- Choose maize and cassava varieties suited to your area.
- Decide which crop is the main priority before fixing plant population.
- Plant when soil moisture is adequate.
- Use locally tested spacing rather than copying a universal internet figure.
- Control weeds early.
- Manage soil fertility for both crops.
- Use only crop protection products that are appropriate and registered for the situation.
- Keep records of yield and cost for both crops.
What research says
FAO’s review of cassava production in Africa reports that cassava is frequently intercropped and identifies cassava: maize as the most common cassava based combination in the countries studied. The same review stresses that optimum cassava plant density is location specific.
IITA has also conducted cassava: maize intercropping research in Nigeria as part of its cassava agronomy work, reinforcing the need for recommendations that respond to local conditions rather than a single blanket recipe.
For farmers planning expansion or financing, see our guide on agricultural businesses and access to credit.
Bottom line
Maize: cassava intercropping can be a sensible Nigerian farming system when the crops are properly balanced. The goal is not simply to put maize and cassava in the same field; it is to manage plant population, timing, weeds, soil fertility and moisture so that the combined harvest justifies the land, labour and inputs used.
If you are trying the system for the first time, start on a manageable area, keep records and adjust the next planting from what actually happened on your farm.
Sources: FAO review of cassava production in Africa; IITA cassava: maize intercropping research in Nigeria.
This article provides general crop production information. Variety choice, pesticide use, fertiliser rates and planting recommendations should be checked against current local extension guidance, product labels and conditions on your farm.
