Preferred hybrids: Pakchong 1, Super Napier, or Taiwan Napier, selected for high biomass yield and methane productivity.
Stem cuttings or root splits propagated in nurseries; planting material ready in 45–60 days.
Fields plowed, leveled, and furrowed at 0.75–1 m spacing.
Planting density: 8 000–10 000 clumps per rai.
Initial fertilization with composted manure or digestate from previous biogas operations.
Irrigation: Drip or sprinkler systems ensuring 20–25 mm/week.
Fertilization: Organic amendments every 3 months.
Weed control: Mechanical or mulching; no herbicides.
Rejuvenation: Grass coppices after every cut; lifespan 4–5 years.
Expected productivity: 180–220 tons fresh weight/ha/year (≈ 18–22 tons DM/rai/year).
First cut at 90–100 days after planting, then every 60–70 days depending on rainfall.
Harvested with forage harvesters, chopped to 2–4 cm.
Fresh Napier hauled within 12 hours to maintain silage quality.
At collection hubs, Napier is ensiled in bunker silos or bale wraps with 2–3 % molasses to stabilize for 6–8 months.
Moisture ≈ 65–70 %, optimal for anaerobic digestion.
Silage transported daily to the digester within 10–20 km radius using 10-ton trucks.
Co-digestion with cattle or swine manure enhances methane yield by 10–15 %.
Digestate returned to Napier fields as organic fertilizer, closing the nutrient loop and reducing synthetic fertilizer use by 80 %.
Silage unloaded into mixing tanks, pre-blended with water and trace nutrients.
Automated feeding systems ensure constant substrate loading rate.
Quality control (TS, VS, pH, C:N ratio) monitored daily.
Feedstock reliability: Contracted farmers within 20 km radius guarantee continuous year-round supply.
Economic inclusion: > 100 farmers participate, earning stable income from Napier sales and organic fertilizer returns.
Climate impact: Avoids ≈ 25 000 tCO₂e/year via methane capture and fossil-fuel substitution.
Scalability: Every 1 MWe module can be replicated regionally with dedicated feedstock clusters.
Our Napier-grass supply chains are fully integrated, traceable, and contractually secured, ensuring predictable fuel cost, stable operations, and long-term sustainability. Napier grass feedstock system forms a self-reinforcing circular model—farming, energy, and soil health—delivering measurable climate impact and social co-benefits that investors can trust.