@misc{10481/78085,
year = {2022},
month = {10},
url = {https://hdl.handle.net/10481/78085},
abstract = {Spent coffee grounds are a bio-residue
studied as soil organic amendment and
it has been proven that it has short-term
effects on soil physical properties.
However, its sequential effects on the cultivation of clayey soils are little studied.
Therefore, an in vitro experiment was carried out to evaluate the effect of increasing
doses (1%, 2%, 2.5%, 5%, 7.5%, 10%, 12.5% and 15%) of spent coffee grounds on
the physical properties of a clayey soil in the Spanish Mediterranean area which
is rich in smectites. The addition of spent coffee grounds increased water retention
at −33 and −1500 kPa proportionally to the added amounts, but the increase
in the wilting point was much larger than the field water capacity, decreasing
the plant available water content. A non-linear
influence on the aggregate size
is demonstrated. It increased total porosity and consequently reduced soil bulk
density. This fact was reflected in the stereomicroscopy images where an increase
in the pores analysed with image analysis was observed. Furthermore, SEM images
corroborate that spent coffee grounds act intensely in the short-term
due to
the interaction between their particles and those of clay. The 5% dose acted as a
threshold dose from which the greatest effects on soil physical properties occur.
In general, the use of SCG as an organic amendment is a good sustainable solution
because it supposes a reuse of this bio-residue
(15 million tons per year), an
increase in soil organic carbon (SCG contains ≈ 50% carbon) and an improvement
of the soil physical and chemical properties.},
organization = {Andalusian Ministry of Economic Transformation, Knowledge Industry and Universities},
publisher = {Wiley},
keywords = {Organic amendment},
keywords = {Organo-mineral interaction},
keywords = {Porosity},
keywords = {Smectitic soil},
title = {Sequential effects of spent coffee grounds on soil physical properties},
doi = {10.1111/sum.12853},
author = {Cervera Mata, Ana Gloria and Molinero García, Alberto and Martín García, Juan Manuel and Delgado Calvo-Flores, Gabriel},
}