Influence of Biochar Amendment on Herb Growth in a Green Roof Substrate

다국어 초록 (Multilingual Abstract)

The objectives of this research were: 1) to assess the effect of biochar incorporation on the growth of basil(Ocimum basilicum ‘Genovese Compact, Improved’) and peppermint (Mentha × piperita) and, 2) to determine thephysical characteristic differences in heat-expanded clay (HEC) substrate following incorporations of biochar at 5%,10%, or 15% (by volume). A commercially-available green roof substrate, Rooflite Intensive Ag (IA) substrate, wasincluded for comparison. The IA substrate had the highest total porosity (TP), container capacity (CC), and air-filledporosity (AP). The HEC substrate showed a linear increase in TP and CC and a linear decrease in dry bulk densitywith increasing amounts of biochar. The commercially available IA substrate had the highest water retention (CC =25.0%). Overall, there was a maximum increase of peppermint shoot dry weight (g/shoot) response in the HECsubstrate using 15% biochar. Coverage area measurements indicated that peppermint benefited more than basil fromthe incorporation of biochar. Biochar alone did not influence stomatal conductance, although basil or peppermintgrown in the IA substrate had higher stomatal conductance than plants grown on HEC with all three biocharincorporation rates at 3 and 4 d after irrigation, probably due to the lower aboveground biomass of the IA-grownplants. In conclusion, the addition of biochar amendment to HEC substrate had a minor influence on peppermintgrowth and no influence on stomatal conductance of either basil or peppermint.

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