Introduction: The Hidden Crisis in the Food System

Every year, millions of tons of food are lost after harvest, long before it ever reaches a plate. In sub-Saharan Africa, up to 30% of grains are lost due to poor drying, pests, mold, and inadequate storage. This isn’t just an economic problem, it’s a sustainability crisis.

Wasted food means wasted water, fertilizer, land, and labor. It also increases greenhouse gas emissions, while the people growing it, majorly the smallholder farmers, remain in poverty.

But what if there was a way to stop the loss before it begins?

At Sesi Technologies, we believe sustainability doesn’t start at the factory or the fork—it starts right on the farm, after the harvest. That’s why we’ve developed postharvest tools like GrainMate and ZeroFly Hermetic Storage Bags to help farmers cut losses, protect their crops, and build a better food system for everyone.

Why Postharvest Losses Are a Sustainability Issue

Most sustainability conversations focus on food production like climate-smart seeds, regenerative soil practices, and reduced emissions. But few talk about what happens after the crops are harvested.

Yet, in Africa:

• Up to 1/3 of food is lost postharvest.

• This wasted food consumes 21% of freshwater, 19% of fertilizer, and 18% of cropland used to grow it.

• Decomposing spoiled grain contributes to methane emissions, a potent greenhouse gas.

Reducing postharvest loss is one of the most direct ways to improve food security, farmer income, and environmental outcomes.

GrainMate Moisture Meter: Precision Drying to Prevent Spoilage

Most grain spoilage happens because crops are stored with excess moisture. This leads to mold, insects, and rotting. Traditionally, farmers judge dryness by biting the grain or feeling it between their teeth, a method that’s highly unreliable.

GrainMate Moisture Meter changes this by giving farmers:

• Accurate moisture readings in minutes.

• A portable, battery-powered device for on-field use.

• Support for multiple grains including maize, rice, millet, and beans.

Why it matters: When farmers know exactly when their grains are dry enough to store, they avoid mold and minimize food loss. That means fewer greenhouse gases and less pressure to overproduce.

ZeroFly Hermetic Storage Bags: Airtight. Chemical-Free. Reliable.

Even after proper drying, grains are still vulnerable during storage. Insects, rodents, and fungal contamination can destroy months of hard work. Many farmers resort to chemical treatments that are costly, risky, and environmentally harmful.

ZeroFly Hermetic Storage Bags offer a smarter solution:

• Airtight, multi-layered bags that prevent oxygen entry and pest survival.

• Infused with insecticide on the outer layer—safe for grains, deadly to pests.

• No need for chemicals or fumigation inside the bag.

• Durable and reusable for multiple seasons.

Why it matters: ZeroFly bags reduce pesticide use, preserve grain quality, and allow farmers to sell when prices are higher, contributing to better incomes and food system resilience.

GrainMate Warehouse Monitor: Smarter Storage, Less Spoilage

Even properly dried grains can go bad if they’re stored in poor conditions. High humidity and heat in warehouses can silently trigger mold growth, pest infestations, and nutrient loss—especially in tropical regions.

Traditionally, warehouse monitoring has been a guessing game. But not anymore.

GrainMate Warehouse Monitor empowers warehouse managers and aggregators with:

• Real-time temperature and humidity monitoring to detect dangerous conditions early
• Alerts and notifications when environmental parameters exceed safe thresholds
• Data logging for long-term trend analysis and improved decision-making
• Durable design for 24/7 warehouse use in rural and remote areas

Why it matters: By giving users visibility into the storage environment, this tool prevents silent grain losses and ensures grains maintain their quality, value, and safety, long after harvest.

Closing the Loop: Environmental and Economic Wins

By reducing grain spoilage and extending shelf life, technologies like GrainMate and ZeroFly directly support key sustainability outcomes:

Environmental Impact:

• Less food waste = less methane, less deforestation for expansion, and more efficient input use.

• Reduced pesticide reliance lowers contamination risks to water and soil.

Economic Impact:

• Farmers earn more by preserving the quality of what they grow.

• Less loss = more income, better planning, and access to premium markets.

Food Security:

• Stored grains become available year-round, especially during lean seasons.

• A resilient storage system means less dependence on emergency food aid.

Sustainability Isn’t Just About Production, It’s About Preservation

For Africa to sustainably feed its growing population, we need to produce and preserve more with fewer resources. That’s the promise of sustainable postharvest solutions.

At Sesi Technologies, we’re proud to lead this transformation with tools that meet smallholder farmers where they are—affordable, reliable, and designed for real-world conditions.