Maize Production and Challenges in Cameroon

Maize (corn) is a critical global staple crop, domesticated over 9,000 years ago in Mesoamerica. It is the leading cereal globally in terms of production, exceeding 1 billion metric tons annually, and the second most widely grown crop after wheat. Its high yield (5.8-5.9 t/ha) is attributed to hybrid varieties and improved inputs. Maize is a major source of carbohydrates, provitamin A carotenoids, B-complex vitamins, iron, zinc, magnesium, and calcium, contributing significantly to global food calories and protein intake. However, nutrient bioavailability can be limited by phytic acid.

In sub-Saharan Africa (SSA), especially Cameroon, maize is vital for food security, livelihoods, and industry. It's the primary dietary staple for over 6 million Cameroonians, with 75% of national production consumed domestically and the rest used for animal feed and industrial processing. Despite its importance, Cameroon faces a significant yield gap; actual farm yields (1.5-1.8 t/ha) are far below the global average (5.9 t/ha) and achievable research station yields (5-6 t/ha). This gap is prevalent across SSA, with production increases relying on area expansion rather than productivity.

The domestic yield gap in Cameroon is driven by low mechanization, limited access to quality inputs, suboptimal agronomic practices, and severe weed pressure. The country faces a deficit, with average national production (2.2 million tonnes) falling short of demand (2.8 million tonnes), leading to increased imports and significant economic drain. Smallholders also contend with high production costs (around CFA 428,000 per hectare) and substantial post-harvest losses, which severely reduce profitability.

Weed infestation is one of the most destructive biotic constraints to maize productivity. Weeds vigorously compete with maize for essential resources (sunlight, water, nutrients, space), particularly during the critical early growth stages (planting to six weeks). Uncontrolled weeds can cause devastating yield losses ranging from 20% to 100%, with global averages around 37% and maize-specific losses between 28% and 100% if not managed during the critical period (15 to 45 days after sowing). Tropical regions like Cameroon face diverse and aggressive weed flora, including grasses, broad-leaved weeds, and sedges.

Weeds negatively impact maize both biologically and economically. Physiologically, weeds stunt plant height, reduce leaf area, and decrease dry matter accumulation, leading to delayed maturity and lower grain yield and quality. Economically, weeds significantly increase production costs, requiring intensive manual labor or expensive chemical herbicides. In resource-limited smallholder systems, poor weed control due to labor shortages and high input costs exacerbates the yield gap, diminishes farmer income, and forces reliance on food imports despite strong domestic potential.

Establishing effective and economically viable weed management strategies is crucial for closing the yield gap, maximizing farm profits, and ensuring sustainable, food-secure maize production in Cameroon. These frameworks must integrate cultural, mechanical, and targeted chemical approaches to combat weed pressure effectively.