Chemical and microbiological soil properties in organic and conventional management systems of<i>Coffea arabica</i>L.

Azevedo, Romildo Rocha; Santos, Janaina Biral dos; Baretta, Dilmar; Ramos, Alessandro Coutinho; Pereira, Arthur Prudêncio de Araújo; Cardoso, Elke Jurandy Bran Nogueira

doi:10.1080/01904167.2017.1346128

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…Fewer fungal indicator taxa were discovered, with only 4 fungal ASVs associated with the conventional system but 17 with the organic system. The four ASVs associated with the conventional system came from different genera, while Holtermanniella (6) and Mucor (4) were the most represented indicator genera in the organic system. Fifteen of the 78 taxa identified by indicator species analysis were also differentially abundant.…”

Section: Resultsmentioning

confidence: 99%

“…inputs and tillage have been shown to shape bulk soil microbial communities and functions across spatial and temporal scales (1)(2)(3)(4). Comparisons of bulk soil under different management strategies, i.e., organic (nutrients provided from sources other than synthetic inputs) versus conventional management, have revealed effects on soil properties that, in turn, drive variation in microbial communities at small and intermediate scales (5)(6)(7)(8). Small-scale studies designed to minimize environmental heterogeneity, such as long-term experiments on a single site, show strong effects of management on soil physicochemical parameters (9,10), microbial biomass (9), and habitat-specific bacterial and fungal taxa (11).…”

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confidence: 99%

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Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Schmidt

Vannette

Igwe

et al. 2019

Appl Environ Microbiol

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Agricultural management practices affect bulk soil microbial communities and the functions they carry out, but it remains unclear how these effects extend to the rhizosphere in different agroecosystem contexts. Given close linkages between rhizosphere processes and plant nutrition and productivity, understanding how management practices impact this critical zone is of great importance to optimize plant-soil interactions for agricultural sustainability. A comparison of six paired conventional-organic processing tomato farms was conducted to investigate relationships between management, soil physicochemical parameters, and rhizosphere microbial community composition and functions. Organically managed fields were higher in soil total N and NO 3 -N, total and labile C, plant Ca, S, and Cu, and other essential nutrients, while soil pH was higher in conventionally managed fields. Differential abundance, indicator species, and random forest analyses of rhizosphere communities revealed compositional differences between organic and conventional systems and identified management-specific microbial taxa. Phylogeny-based trait prediction showed that these differences translated into more abundant pathogenesis-related gene functions in conventional systems. Structural equation modeling revealed a greater effect of soil biological communities than physicochemical parameters on plant outcomes. These results highlight the importance of rhizosphere-specific studies, as plant selection likely interacts with management in regulating microbial communities and functions that impact agricultural productivity. IMPORTANCE Agriculture relies, in part, on close linkages between plants and the microorganisms that live in association with plant roots. These rhizosphere bacteria and fungi are distinct from microbial communities found in the rest of the soil and are even more important to plant nutrient uptake and health. Evidence from field studies shows that agricultural management practices such as fertilization and tillage shape microbial communities in bulk soil, but little is known about how these practices affect the rhizosphere. We investigated how agricultural management affects plant-soil-microbe interactions by comparing soil physical and chemical properties, plant nutrients, and rhizosphere microbial communities from paired fields under organic and conventional management. Our results show that human management effects extend even to microorganisms living in close association with plant roots and highlight the importance of these bacteria and fungi to crop nutrition and productivity.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Schmidt

Vannette

Igwe

et al. 2019

Appl Environ Microbiol

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“…To evaluate the sustainability of a cultivation system, it is important to utilize good indicators of soil quality (Antunes et al 2013, Azevedo Junior et al 2017. These indicators must be sensitive to soil modifications, be part of the ecosystem functions, be easy to determine, easily understandable, and must be comparable with other indicators (Swift et al 2004, Rousseau et al 2013.…”

Section: Introductionmentioning

confidence: 99%

Soil macrofauna in organic and conventional coffee plantations in Brazil

et al. 2018

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Brazil has always been one of the most important coffee producing countries. Lately, there has equally been a renewed interest in alternative coffee production systems. The state of Espírito Santo is the second greatest coffee producer in Brazil; so, we used local coffee plantations to evaluate the relations between soil macrofauna and chemical and microbiological soil properties to identify which of these properties discriminate more effectively between the organic management system (OS) and the conventional management system (CS) of coffee plantations. For each of these two cultivation systems we chose three coffee farms who employed both cultivation systems and picked out the most similar fields from each property. At each site, first we sampled the litter at the soil surface. Afterwards, we sampled nine soil monoliths to evaluate the macrofauna, in summer and winter. We also collected nine supplemental soil samples, taken at a few centimeters from the soil monoliths, for chemical and microbiological analyses. Macrofauna density was evaluated by ANOVA and multivariate analysis. The chemical and microbiological properties are environmental variables, while the data on macrofauna are the explanatory variables. The total number of individuals recovered in this study was 3,354, and the climate, identified by the sampling season, was a great modulator of macrofauna, with higher numbers in winter. The principal components analysis showed that soil moisture, organic matter, nitrogen, phosphorus, boron, copper, pH, acid and alkaline phosphatases and microbial biomass carbon, were the most outstanding ones to discriminate both cultivation systems. We found no statistical significant differences in macrofauna density between OS and CS, probably due to a general great variability, since there was a tendency for much greater values in OS. We detected the interference of chemical and microbiological soil properties on the macrofauna community in both systems of coffee cultivation, and some results clearly correlated much better with climate data than with other factors. To our knowledge, this is the first time in which the data point to a clear separation between the more numerous and diversified soil macrofauna in coffee with organic cultivation from that with a conventional cultivation system.

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