Files and links (1)
A meta-analysis and review of plant-growth response to humic substances: practical implications for agriculture1.21 MB
AcceptedCC BY-NC-ND V4.0, Open Access
Journal article
A Meta-Analysis and Review of Plant-Growth Response to Humic Substances: Practical Implications for Agriculture
Advances in Agronomy, Vol.124, pp.37-89
2014
Metrics
36 File views/ downloads
11 Record Views
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites
Abstract
The breakdown products of plant and animal remains, extracted in an alkaline solution, are commonly referred to as humic substances (HS). They can be extracted from a wide variety of sources, including subbituminous coals, lignites (brown coals), peat, soil, composts, and raw organic wastes. The application of HS to plants has the potential to improve plant growth, but the extent of plant-growth promotion is inconsistent and relatively unpredictable when compared to inorganic fertilizers. The goal of this review was to determine the magnitude and likelihood of plant-growth response to HS and to rank the factors contributing to positive growth promotion. These factors included the source of the HS, the environmental growing conditions, the type of plant being treated, and the manner of HS application. Literature reports of exogenously applied HS–plant interactions were collated and quantitatively analyzed using meta-analytic and regression tree techniques. Overall, random-effects meta-analysis estimated shoot dry weight increases of 22 ± 4% and root dry weight increases of 21 ± 6% in response to HS application. Nevertheless, actual responses varied considerably and were mainly influenced by the source of the HS applied, the rate of HS application, and to a lesser extent, plant type and growing conditions. HS from compost sources significantly outperformed lignite and peat-derived HS in terms of growth promotion, while HS application rate nonlinearly moderated the growth response under different circumstances. Our results demonstrate the difficulty in generalizing recommendations for the use of HS in agriculture; however, some specific suggestions for maximizing the efficacy of HS under certain conditions are offered. We also outline some recent developments in the use of HS as synergists for improving fertilizer use efficiency and the activity of microbial inoculants. Finally, we identify a number of research gaps, which, when addressed, should clarify how, when, and where HS can be best applied for the greatest benefit.
Details
- Title
- A Meta-Analysis and Review of Plant-Growth Response to Humic Substances: Practical Implications for Agriculture
- Creators
- Michael T. Rose (Author) - Monash UniversityAntonio F Patti - Monash UniversityKaren R. Little - Monash UniversityAlicia L. Brown - Monash UniversityW. Roy Jackson - Monash UniversityTimothy R Cavagnaro - Monash University
- Publication Details
- Advances in Agronomy, Vol.124, pp.37-89
- Publisher
- Academic Press
- Identifiers
- 991013134013802368
- Copyright
- © 2014 Elsevier Inc. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article