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Increasing demand for sustainable and low-cost alternatives to peat is a challenge in the production of container-grown plants. Biochar (BC) and compost, as eco-friendly materials, could be used to completely or partially substitute for peat. However, information regarding plant responses to the substitution is limited. This study evaluated effects of the amendment of a BC or a BC-compost mixture (BioComp) to a peat-based substrate at 20% by volume on the growth of Syngonium podophyllum. BC was pyrolyzed from wheat straw at 350 °C. Compost was made from farm green waste. BC or BioComp amendment elevated the pH and electrical conductivity of formulated substrates and improved plant growth. Concentrations of nitrogen, phosphorus, potassium, and chlorophyll in leaves and the net photosynthetic rate of plants grown in BC or BioComp amended substrates were significantly higher than those grown in the control substrate. Total soluble protein and total phenolic contents were greater in plants grown in BC- or BioComp-amended substrates as well, but no significant difference occurred in reactive oxygen-related enzymatic activities, reducing power or proline contents across substrates. Our results show that BC or BioComp can be used to replace 20% of peat by volume, and such replacement enhanced S. podophyllum growth.

Biochar or Biochar-Compost Amendment to a Peat-Based Substrate Improves Growth of Syngonium podophyllum