Comparison of two alkali trap methods for measuring the flush of CO ₂

Soil biological activity is a key feature of healthy soil. The flush of CO 2 during the first few days after rewetting of a dried soil is a rapid indicator of soil biological health, but variations in approach require testing and calibration. A 3‐d incubation method (25°C, 50% water‐filled pore space, acid titration) was compared with a 4‐d incubation method (∼20°C, capillary wetted, electrical conductivity) from two long‐term field experiments...