Relationships between soil quality indicators, redox properties, and bioactivity of humic substances of soils under integrated farming, livestock, and forestry

Baldotto, Marihus Altoé; Baldotto, Lílian Estrela Borges

doi:10.1590/0034-737x201865040010

Cited by 10 publications

(7 citation statements)

References 16 publications

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“…Most chemical indicators of soil quality were related to traditional soil fertility assessments (Figure 5). Other assessments include C and N fractions (evaluated in 23% of the reviewed studies), P fractions (Costa et al., 2014; Deiss et al., 2016; Salton et al., 2014), C stocks (Baldotto & Baldotto, 2018; Rakkar et al., 2019) and electrical conductivity (Hilimire et al., 2013). The work of Baldotto and Baldotto (2018), for example, found that both carbon stocks and bioactivity of humic substances were higher in an integrated crop–livestock–forestry system than in a pasture ( Brachiaria decumbens ) in the topsoil (up to 20 cm) of a Ferralsol, demonstrating the importance of the forestry component in integrated systems.…”

Section: Resultsmentioning

confidence: 99%

Soil quality assessments in integrated crop–livestock–forest systems: A review

Valani

Martíni

Silva

et al. 2020

Soil Use and Management

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Integrated crop–livestock–forest is a promising strategy to improve soil quality. It comprises four different integrated farming systems: crop–livestock, crop–forest, forest–livestock and crop–livestock–forest. This work systematically reviewed studies about integrated crop–livestock–forest systems and soil quality. A total of 92 papers were retrieved from the Web of Science—Clarivate Analytics platform, and the following information was analysed: publication year, institution, region of the studied site, type of integrated system, soil type, tillage system, maximum soil depth and the soil quality indicators assessed. Most studies were published in the second half of the 2010s. Brazil is a prominent focus of research about soil quality and integrated crop–livestock–forest systems, with significant contribution from its central and southern regions. The Embrapa was the main publishing institution, present in over one‐third of the studies. Crop–livestock was the most common integrated system, Ferralsols was the most common soil group, and most of the studied soils were clayey. No tillage was the main tillage system. Most studies focused on the topsoil, assessing physical and/or chemical soil quality indicators. More emphasis on biological indicators of soil quality is required, as well as assessments integrating biological, physical and chemical indicators of soil quality. Future works should compare different integrated systems, including assessments deeper in the soil profile, especially in systems with the forest component, and also in sandy and silty soils. Soil quality indicators that have been rarely used should be further tested. Novel indicators should be added to better understand the promotion of soil quality by integrated crop–livestock–forest systems.

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Section: Resultsmentioning

confidence: 99%

Soil quality assessments in integrated crop–livestock–forest systems: A review

Valani

Martíni

Silva

et al. 2020

Soil Use and Management

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“…The positive effects on biomass increase indicate the biostimulating potential of humic acids, especially HApl. This humic acid present smaller C/N ratio, a humification index (Baldotto et al, 2007: Baldotto & Baldotto, 2018) correlated with the bioactivity of humified organic matter. Baldotto & Baldotto (2018) confirmed a relationship between the humification degree and the bioactivity of humic substances.…”

Section: Rlmentioning

confidence: 91%

“…This humic acid present smaller C/N ratio, a humification index (Baldotto et al, 2007: Baldotto & Baldotto, 2018) correlated with the bioactivity of humified organic matter. Baldotto & Baldotto (2018) confirmed a relationship between the humification degree and the bioactivity of humic substances. The authors indicated that humic substances presents bioactivity in part because they contain residues like plant hormones in their structure and the aromatic and hydrophobic nature of stable carbon in combination with the aliphatic and hydrophilic character of humic substances results in a supramolecular structure with a large ion retention capacity.…”

Section: Rlmentioning

confidence: 91%

“…It increases in proportion to the accumulation of stimulant biopolymers such as residues of auxins, which are not decomposed by microorganisms as are other polymers like carbohydrates, proteins, cellulose, etc., whose breakdown products remain within the supramolecular structure of humic substances. The organic matter solubilization allows it to be reused by plants, and the isolation of humic substances makes them bioactive and biostimulant in plants (Baldotto & Baldotto, 2014: Baldotto & Baldotto, 2018.…”

Section: Rlmentioning

confidence: 99%

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Initial performance of Achillea millefolium in response of humic acids

et al. 2021

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Owing to numerous health benefits, the cultivation of medicinal plants has significantly increased. Achillea millefolium L. (common names: milefoil, yarrow) is attributed important medicinal properties. Consumers of herbal medicinal products demand for production systems based on ecological farming principles, thus an interesting technology would be application biostimulant based on humic acids. The objective of this study was to evaluate the rooting and initial performance of Achillea millefolium in response to the use of humic acids (HA) isolated from composted cattle manure and poultry litter and applied in different concentrations (0, 10, 20, 30, and 40 mmol L -1 of HA) at the propagation phase. Rooting and plant biomass accumulation were analyzed. Humic acids derived from poultry litter promoted root development and increase of fresh biomass and total dry mass, proving their biostimulant effect. The optimal concentration of humic acids estimated for the initial development of A. millefolium was 22.25 mmol L -1 .

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“…Keeping SOM in hot arid regions is difficult due to its low availability and high degradation rates (Souri et al., 2019). Thus, C sequestration is emerging as a strategy to improve soil C and ensure soil sustainability (Baldotto, & Baldotto, 2018; Prashanth et al., 2021; Sun et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Organic fertigation system in saline‐sodic soils: A new paradigm for the restoration of soil health

2021

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A continuous decline in soil organic C (SOC) and an increase in salt‐affected areas are a challenge to future sustainability. We searched on the scientific databases of Web of Science, Scopus (Elsevier) database, and Google. We reviewed 101 studies of the last 25 yr with the following keywords: drip irrigation, fertigation system, liquid biochar, liquid organic, organic fertigation, saline‐sodic soils, and salinization. Our objectives were to identify knowledge gaps to direct future organic research and assess the effect of organic amendments on meeting the plant's N, P, and K requirements in saline‐sodic soils. The review showed that organic fertigation systems reduce salt concentration in irrigation water and inhibit glutamine synthetase by N‐fixing diazotrophs. The system increases photosynthetic activities in plants, microbial biomass C, bacterial colonization, plant–mycorrhizal association, and phospholipid‐derived fatty acids from microbes. It increases essential soil nutrients, including SOC; increases salt/water stress tolerance; and reduces Na+ ion toxicity in plants by regulating abscisic acid pathways in saline‐sodic soils. It creates a conducive environment for phosphatase, dehydrogenase, urease, protease, α‐amylase, and gibberellins. This review sketches the role of silicic acid, salicylic acid, and liquid organics in plant growth mechanisms: enhanced photosynthesis, increased salt/water tolerance, and reduced Na+ toxicity. It suggests novel strategies to develop a task force to promote a community–corporate farming system to adopt cost‐effective green technologies for bioresource regeneration, diverse market production, and social capital generation. We develop a synergy between organic fertigation system and community–corporate farming to bring much‐needed agricultural sustainability.

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Relationships between soil quality indicators, redox properties, and bioactivity of humic substances of soils under integrated farming, livestock, and forestry

Cited by 10 publications

References 16 publications

Soil quality assessments in integrated crop–livestock–forest systems: A review

Soil quality assessments in integrated crop–livestock–forest systems: A review

Initial performance of Achillea millefolium in response of humic acids

Organic fertigation system in saline‐sodic soils: A new paradigm for the restoration of soil health

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