The Thien Chi Center operates an agricultural program in Duc Linh to produce biochar fertilizer as a direct, low-cost alternative to commercial chemical fertilizers. This sustainable process converts local organic biomass into a nutrient-dense additive, drastically reducing operational input costs for low-income households.
The production begins with the collection of agricultural crops, vegetable leftovers, and organic food waste. This biomass is loaded into a large steel tub container where it burns for four hours. This high-temperature, limited-oxygen environment transforms the raw waste into a highly porous, carbon-rich charcoal and mineral ash.
Next, the raw biochar is blended with natural cow manure. Because pure biochar contains no nutrients on its own, this co-composting step is critical to "charge" the biochar. This step fills the carbon with essential nutrients instead of soaking up the nutrients already in the ground while effectively preventing vital elements like nitrogen and calcium from washing away.
This combined mixture is left to sit and mature for two months. During this period, the pile requires active physical management to ensure proper aerobic fermentation. Farmers and center workers use tools to manually turn and agitate the mixture at least once a month to keep the fermentation uniform and balanced.
Finally, the stabilized biochar fertilizer is distributed directly to supported smallholders in rural farming communities. Once applied, it permanently boosts water retention, which is critical for drought management and significantly reduces overall irrigation needs. It also improves aeration in heavy soils, provides a secure microhabitat that increases beneficial microbial diversity, optimizes long-term soil health and absorbs toxins to limit heavy metal uptake in crops.