*2.3. Potting Experiment*

Plastic pots were filled with 1.2 kg of 2 mm sieved soils and amended with 0.0 (control), 0.5, 1.0, 2.0, and 4.0% (*w*/*w*) of 0.25 mm sieved SGB and PLB. The biochar-amended soils were incubated for approximately 30 days at 75% of field capacity before ryegrass sowing in each pot at 30 kg ha−1. Ryegrass was grown for ~75 days in the biochar amended soils in an environmentally controlled growth chamber. The pots were arranged in a complete randomized block design (CRBD) with 3 replicates (n = 3) and rotated weekly to eliminate spatial variability in the chamber. All procedures and analyses conducted during the potting experiment are detailed in Antonangelo and Zhang [11].
