Dr Subhadip Ghosh from the Centre for Urban Greenery and Ecology, National Parks Board, Singapore and two colleagues from the University of New England in NSW, Australia published the following paper early last year. The paper is listed with IBI but I managed to miss the release...
Influence of biochar and compost on soil properties and tree growth in a tropical urban environment
Abstract (<
Research relating to the use of
organic amendments on soils has focused largely on agricultural soils,
and there is a lack of information worldwide on their efficacy as
amendments for urban soil management, especially in tropical urban
environments. A pot experiment was conducted to assess the influence of
biochar and organic compost on urban soil properties and on tree growth
performance in Singapore. Biochar and compost were mixed with topsoil in
different proportions, and two urban tree species commonly grown in
Singapore (Samanea saman and Suregada multiflora) were used. There were significant additional height increments for both the tree species following application of biochar. S. saman exhibited greater stem elongation compared with S. multiflora
in response to organic amendments. A significantly higher foliar N
content was found in both tree species in biochar-amended treatments
along with significant increases in P and K. Increases in soil nutrient
concentrations were also observed in combined biochar–compost treatments
for both species. Combined compost and biochar had the strongest
effects on soils and growth of the two urban tree species examined and
applications containing biochar resulted in the most significant soil
improvements.
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