After growing for 5 weeks, rice seedlings were transplanted to soils with or without biochar. The seedlings grew under
flooded conditions with a layer of water about 2 cm above the soil
surface. The rice was cultured in a green house set to 14 h daytime
with a light intensity of 350 lmol m 2 s 1, 28 and 20 C day and
night temperatures, and a relative humidity of 60–70%