Soil could play an important role in climate targets, but carbon accumulation is neither instant nor uniform. Texas A&M AgriLife specialist Jake Mowrer describes how reduced tillage, cover crops and organic amendments can help, while emphasising the limits of short-term measurement.
Carbon is part of a wider soil system
No-till can reduce disturbance and help retain carbon compared with conventional tillage, although results vary with soil, year, crop and rainfall. Cover crops keep living roots in the ground, add temporary carbon, support soil organisms and can reduce erosion and recycle nutrients.
Mowrer cautions that cover-crop carbon changes fluctuate with sampling time and may build too slowly to detect in fewer than five years in hot Texas conditions. A cover crop grown for one narrow purpose may also miss other benefits or create avoidable management problems.
Use a systems approach
The combination of reduced tillage, covers and compost may protect existing carbon and build it gradually. Compaction, inappropriate species or poorly timed operations can offset progress, so regional adaptation matters more than a generic mix.
The article is a useful counterweight to simple carbon claims: soil practices can contribute, but measurement needs patience, consistent methods and attention to the agronomic benefits that occur before a large carbon change becomes visible.
Read the full Farm Progress article.