The impact in numbers
+25%
average crop yield increase in tropical regions
−30%
potential reduction in synthetic fertiliser use
3x
water retention improvement
Agronomic mechanisms
Water retention
Biochar's porous structure retains moisture during dry spells — critical for crop development in tropical regions with pronounced dry seasons.
Nutrient retention
Biochar reduces nitrogen and phosphorus leaching, keeping nutrients available in the root zone longer and reducing the frequency of fertiliser applications.
pH correction
On acidic tropical soils (pH 4.5–5.5), biochar gradually raises pH, improving the availability and uptake of essential micronutrients across crop types.
Microbial activity
Biochar's porous surface is an ideal habitat for mycorrhizal fungi and beneficial bacteria, which extend roots' effective nutrient absorption capacity.
Scientific backing
The most comprehensive meta-analysis on tropical biochar, by Jeffery et al. (2017), reviewed hundreds of studies and demonstrated an average 25% production increase in tropical regions at a median application rate of 1.5 kg/m2. Effects are particularly pronounced on highly weathered, acidic tropical soils — precisely where NetZero operates.
At NetZero, we conduct our own agronomic trials in partnership with local farmers and provide ongoing training to ensure correct biochar application.
Results of this meta-analysis reveal a mean yield increase of 25% in Brazil for tropical soils under biochar application.
