Influence of organic and inorganic sources of nutrients on the functional diversity of microbial communities in the vegetable cropping system of the Indo-Gangetic plains

Manjunath, M.; Kumar, Upendra; Yadava, R. B. R.; Bahadur, Awadhesh; Singh, Bijendra

doi:10.1016/j.crvi.2018.05.002

Cited by 26 publications

(13 citation statements)

References 43 publications

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“…Higher soil aeration was reported to stimulate microbial biomass and change community composition in paddy fields, findings which support the determination of improved microbial biomass, activity, and diversity in the aerated irrigation groups in this study (Figure d and Table ). The differences of microbial metabolic functions in the soil samples were indicated by the utilization of 31 kinds of carbon sources during the Biolog microplate analysis. , The clearly differentiated metabolic function groups between the aerated irrigation group and the control (Figure ) further demonstrated that the oxygenation treatments not only boosted microbial activity but also played a constructive role in increasing functional diversity of soil microbial communities . Even though the microbial metabolic functions (Figure b) were undifferentiated between the normal pump-aerated and nanobubble-aerated irrigation treatments, gene level differences in the soil microbial communities may be significant, which need to be further studied.…”

Section: Discussionmentioning

confidence: 94%

Enhancement of Tomato Plant Growth and Productivity in Organic Farming by Agri-Nanotechnology Using Nanobubble Oxygation

Lyu

Yue

et al. 2019

J. Agric. Food Chem.

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21Development of technology to improve the mineralization of organic fertilizer and to enhance 22 crop production is essential to achieve the transition from traditional farming to eco-friendly 23 organic farming. Nanobubble oxygation (NB) was employed to compare with traditional pump 24 aerated oxygation (AW) and a control group through both soil incubation and soil column 25 experiments. Plant-available N and P contents in the NB treatment group were higher than 26 that in the AW and control groups. Enzymatic activities including β-1,4-N-acetyl-27 glucosaminidase, phosphatase, α-1,4-glucosidase, β-1,4-xylosidase, peroxidase, and phenol 28 oxidase were significantly higher in both oxygation groups compared with the control. The soil 29 microbial biomass, activity, and diversity were also significantly improved due to the oxygation 30 treatment. Additionally, the microbial metabolic functions were shifted in both oxygation 31 treatments compared with the control group. The final tomato yield increase from the NB 32 treatment group was 23%, and that from the AW treatment 17%, compared with the control. 33 4 36 52 the applied nutrients from the organic fertilizer can only be utilized by crops after 53 decomposition and mineralization of organic matter and release of plant-available nutrients, 54 such as nitrogen and phosphorous. It has been reported that only 35%, 39%, and 53% of the 55 plant-available nitrogen can be released from cow, pig and chicken manures on farmland over 56 6 months, respectively. 8 As a result, crop production in organic farming has been 57 demonstrated to be up to 25% lower than that in conventional agriculture using chemical Page 4 of 29 ACS Paragon Plus Environment Journal of Agricultural and Food Chemistry 5 58fertilizer. 9 This slow release of mineral nutrients from organic fertilizer has become the major 59 yield-limiting factor, 10 which indicates that further research could focus on the acceleration of 60 the mineralization of organic fertilizer in organic farming. 61The mineralization is driven by microbial biodegradation processes, where oxygen is 62 crucial in order to improve the bio-decomposition rate. The soil oxygen content in traditional 63 farmland originates mainly from air diffusion, which is always limited, especially in the deep 64 soil layer. Thus, an appropriate method to deliver sufficient oxygen into the soil is crucial to 65 improve microbial activity. The application of aerated water to the farmland through a drip 66 irrigation system has been used to deliver oxygen to the crop root zone. 11 Previous studies 67 demonstrated that these approaches could not only enhance crop yields, but could also 68 improve the nutrition quality of fruit. 12 To improve the soil oxygenation efficiency, the 69 aeration pump was upgraded from common air pumps, fine bubble diffusers and to venturi 70 injectors. 13 The main aim of the development of this technique was to deliver smaller-sized 71 air bubbles into irrigation water and to improve oxygen dissolution efficiency. Recen...

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Section: Discussionmentioning

confidence: 94%

Enhancement of Tomato Plant Growth and Productivity in Organic Farming by Agri-Nanotechnology Using Nanobubble Oxygation

Lyu

Yue

et al. 2019

J. Agric. Food Chem.

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“…Organic amendments have been shown to enhance soil food webs by increasing soil microorganisms and reducing plant-parasitic organisms (Treonis et al, 2010). Organic amendments may have differential effects depending on their quality and the type of soil (Pérez-Piqueres et al, 2006;Saison et al, 2006;Bastida et al, 2008) and may strongly affect soil microbial processes and contribute to soil functions and microbial diversity (Ho et al, 2017;Manjunath et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Impact of Olive Saplings and Organic Amendments on Soil Microbial Communities and Effects of Mineral Fertilization

et al. 2021

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Plant communities and fertilization may have an impact on soil microbiome. Most commercial olive trees are minerally fertilized, while this practice is being replaced by the use of organic amendments. Organic amendments can both fertilize and promote plant growth-promoting organisms. Our aims were (i) to describe the changes in soil bacterial and fungal communities induced by the presence of young olive trees and their interaction with organic amendments and (ii) to compare the effects of mineral and organic fertilization. We set up two parallel experiments in pots using a previously homogenized soil collected from a commercial olive orchard: in the first one, we grew olive saplings in unamended and organically amended soils with two distinct composts and compared these two soils incubated without a plant, while in the second experiment, we comparatively tested the effects of organic and mineral fertilization. OTUs and the relative abundances of bacterial and fungal genera and phyla were analyzed by 16S rRNA and ITS1 gene amplicon using high-throughput sequencing. Basal respiration and substrate-induced respiration were measured by MicroRespTM. The effects of the different treatments were analyzed in all phyla and in the 100 most abundant genera. The presence of olive saplings increased substrate-induced respiration and bacterial and fungal richness and diversity. Organic amendments greatly affected both bacterial and fungal phyla and increased bacterial richness while not affecting fungal richness. Mineral fertilization increased the relative abundance of the less metabolically active bacterial phyla (Actinobacteria and Firmicutes), while it reduced the most metabolically active phylum, Bacteroidetes. Mineral fertilization increased the relative abundance of three N2-fixing Actinobacteria genera, while organic fertilization only increased one genus of Proteobacteria. In organically and minerally fertilized soils, high basal respiration rates were associated with low fungal diversity. Basidiomycota and Chytridiomycota relative abundances positively correlated with basal respiration and substrate-induced respiration, while Ascomycota correlated negatively. Indeed, the Ascomycota phyla comprised most of the fungal genera decreased by organic amendments. The symbiotrophic phylum Glomeromycota did not correlate with any of the C sources. The relative abundance of this phylum was promoted by the presence of plants but decreased when amending soils with composts.

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“…McIntosh index (U) was calculated according to Manjunath et al [ 46 ]:

where N is the number of substrates, OD i , is the corrected OD value of each substrate containing well.…”

Section: Methodsmentioning

confidence: 99%

The Biolog EcoPlate™ Technique for Assessing the Effect of Metal Oxide Nanoparticles on Freshwater Microbial Communities

et al. 2021

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The application of Biolog EcoPlate™ for community-level physiological profiling of soils is well documented; however, the functional diversity of aquatic bacterial communities has been hardly studied. The objective of this study was to investigate the applicability of the Biolog EcoPlate™ technique and evaluate comparatively the applied endpoints, for the characterisation of the effects of metal oxide nanoparticles (MONPs) on freshwater microbial communities. Microcosm experiments were run to assess the effect of nano ZnO and nano TiO2 in freshwater at 0.8–100 mg/L concentration range. The average well colour development, substrate average well colour development, substrate richness, Shannon index and evenness, Simpson index, McIntosh index and Gini coefficient were determined to quantify the metabolic capabilities and functional diversity. Comprehensive analysis of the experimental data demonstrated that short-term exposure to TiO2 and ZnO NPs affected the metabolic activity at different extent and through different mechanisms of action. TiO2 NPs displayed lower impact on the metabolic profile showing up to 30% inhibition. However, the inhibitory effect of ZnO NPs reached 99% with clearly concentration-dependent responses. This study demonstrated that the McIntosh and Gini coefficients were well applicable and sensitive diversity indices. The parallel use of general metabolic capabilities and functional diversity indices may improve the output information of the ecological studies on microbial communities.

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Influence of organic and inorganic sources of nutrients on the functional diversity of microbial communities in the vegetable cropping system of the Indo-Gangetic plains

Cited by 26 publications

References 43 publications

Enhancement of Tomato Plant Growth and Productivity in Organic Farming by Agri-Nanotechnology Using Nanobubble Oxygation

Enhancement of Tomato Plant Growth and Productivity in Organic Farming by Agri-Nanotechnology Using Nanobubble Oxygation

Impact of Olive Saplings and Organic Amendments on Soil Microbial Communities and Effects of Mineral Fertilization

The Biolog EcoPlate™ Technique for Assessing the Effect of Metal Oxide Nanoparticles on Freshwater Microbial Communities

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