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| Titel |
A meta-analysis of plant-growth response to humic substance applications |
| VerfasserIn |
Antonio Patti, Michael Rose, Karen Little, Roy Jackson, Tim Cavagnaro |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250083775
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| Zusammenfassung |
| Humic substances (HS) are a category of naturally occurring organic compounds that arise
from the decomposition and transformation of plant, animal and microbial residues
(Maccarthy 2001). The loss of humic material, together with overall reductions in soil organic
matter, is of concern because they play important roles in maintaining key soil functions and
plant productivity (Lal 2004). Consequently, there is interest in the application of HS-based
amendments, often derived from agricultural wastes (e.g composts) to remediate and/or
maintain soil health (Quilty and Cattle 2011). In light of the potential benefits of HS, together
with their inconsistent performance under field conditions, we sought to quantitatively
review the effects of HS on plant growth, by undertaking a meta-analysis of the
literature. A total of 390 papers were originally selected from the current literature.
A number of criteria were applied to reduce this number to 81, from which the
meta-analysis was undertaken. The 81 papers comprised 57 studies presenting data on
shoot (or total) dry weight and 39 studies reporting root dry weight. As part of
the meta-analysis we attempted: (i) to quantify the magnitude and likelihood of
plant growth promotion, in terms of shoot and root biomass, resulting from HS
application, (ii) to determine the influence of environmental conditions, plant type, humic
substance properties, and the manner of application on plant growth response to
HS, (iii) to identify gaps in our understanding of the interaction of HS with plants,
and (iv) to provide some general recommendations for the practical use of HS in
agronomic systems and suggestions for future work. Some of the key findings from this
meta-analysis included: • Many papers lack details on HS chemical characteristics • The
application of HS needs to be tailored to the environmental conditions in which they
will be used. • The effect of HS on shoot biomass was not only dependent on the
source and rate of application, but also the plant type • Environmentally stressful
conditions, rather than the plant type, played a more prominent role in shaping the
root growth response to HS. This finding is especially relevant to the agronomic
use of HS, because soil degradation, climate change and diminishing water and
nutrient resources are becoming increasingly important constraints to agriculture
production, and recommendations for using HS are often directed at alleviating these
stresses.
Blanco-Canqui, H. and Lal R., Mechanisms of Carbon Sequestration in Soil Aggregates,
Critical Reviews in Plant Sciences, 2004, 23 (6), 481-504 MacCarthy, Patrick, Soil Science,
The Principles of Humic Substances, 2001, 166 (11), 738-751 Quilty J.R. and Cattle S.R.,
Use and understanding of organic amendments in Australian agriculture: a review, Soil
Research, 2011, 49(1) 1-26 |
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