Soil Microbial Community Structure and Target Organisms under Different Fumigation Treatments

Dangi, Sadikshya R.; Gerik, J. S.; Tirado-Corbalá, Rebecca; Ajwa, Husein A.

doi:10.1155/2015/673264

Cited by 26 publications

(22 citation statements)

References 37 publications

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“…The use of MeBr and alternative soil fumigation does not result in complete soil sterilization but can result in changes in the microbial community structure (Ibekwe, Papiernik, & Yang, 2010; Dangi et al., 2015). Ten years after fumigation, total microbial biomass in the fumigated plots remained similar to the nonfumigated plots at the surface soil.…”

Section: Discussionmentioning

confidence: 99%

“…Telone C35 and InLine at 305 kg ha −1 without any tarpaulin increased pin nematodes below 100 cm deep, which illustrates challenges in effective orchard replanting treatments without VIF. The use of MeBr and alternative soil fumigation does not result in complete soil sterilization but can result in changes in the microbial community structure (Ibekwe, Papiernik, & Yang, 2010;Dangi et al, 2015). Ten years after fumigation, total microbial biomass in the fumigated plots remained similar to the nonfumigated plots at the surface soil.…”

Section: Discussionmentioning

confidence: 99%

“…Pythium spp. tends to attack juvenile or herbaceous plants, whereas Fusarium solani causes a generalized root rot and Fusarium oxysporum causes vascular wilt (Dangi, Gerik, Tirado‐Corbalá, & Ajwa, 2015). Frequently encountered nematodes in Californian grape production systems are root‐knot ( Meloidogyne spp.…”

Section: Introductionmentioning

confidence: 99%

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Soil microbial community characteristics in a vineyard ten years after fumigation

Dangi

Wang

2021

Soil Science Soc of Amer J

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California is the number one producer of grapes in the United States. Soil fumigation has been used to control soilborne pests and pathogens. However, fumigants can potentially have a negative impact on native soil microbial populations. Given the roles of microorganisms in the soil system, it is important to assess the long-term impact of fumigation on soil microbial communities, which is currently lacking. The objective of this research was to study the long-term impact of microbial communities in grapevine (Vitis vinifera L.) replanting situations after fumigation. Soil treatments included methyl bromide (MeBr), Telone C35, InLine, a nonfumigated control, and a mustard (Sinapis alba L.) cover crop in two side-by-side field experiments fumigated in 2007 and 2008. Microbial community biomass in 2017 and 2018 did not differ between fumigated and nonfumigated plots at the 0-to 30-cm depth. However, plots with shank-injected MeBr and Telone C35 applied in 2008 showed significantly reduced microbial biomass in 2018 at deeper depths than subsurface drip-applied InLine plots. The results show the impact of fumigation on bacterial communities; however, the impact on fungal and arbuscular mycorrhizal fungi (AMF) communities was not evident after 10 years. Furthermore, the effect of depth was apparent on bacterial communities compared with fungal and AMF communities. The data suggest that deep-rooted grapevines influenced fungal populations, which probably supplied labile C in fumigated and nonfumigated plots. Future research needs to focus collectively on the long-term effects of fumigation on fruit quality and yield in vineyards, and on soil microbial communities. INTRODUCTIONGrapes (Vitis vinifera L.) are one of the most valuable crops in the San Joaquin Valley of California. Grape production in California generated $5.79 billion in cash income in 2017, which is up 3.1% from 2016 (California Department of Food and Agriculture, 2018). Soil fumigation prior to planting

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Soil microbial community characteristics in a vineyard ten years after fumigation

Dangi

Wang

2021

Soil Science Soc of Amer J

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“…seedlings (Wang et al, 2018). Previous studies have found that fumigants such as methyl bromide and bitter chloride have significant inhibitory effects on Fusarium oxysporum (Dangi et al, 2015). Our study assessed the effects of five types of fumigant (metham-sodium, dazomet, 1,3-dichloropropene, calcium cyanamide, and methyl bromide) on replanted soil by measuring the number of soil bacteria, fungi, and Fusarium oxysporum.…”

Section: Number Of Microorganisms and The Gene Copies Of Fusarium Oxymentioning

confidence: 99%

Effects of Different Fumigants on the Replanted Soil Environment and Growth of Malus hupehensis Rehd. Seedlings

Chen¹,

Jiang²,

Wang³

et al. 2021

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Apple replant disease (ARD) has been reported in all major fruit-growing regions of the world and is often caused by biotic factors (pathogen fungi) and abiotic factors (phenolic compounds). Soil chemical fumigation can kill soil pathogenic fungi; however, the traditionally used fumigant methyl bromide has been banned because of its ozone-depleting effects. There is thus a need to identify greener fumigant candidates. We characterized the effects of different fumigants on the replanted soil environment and the growth characteristics of Malus hupehensis Rehd. seedlings. All five experimental treatments [treatment 1 (T1), metham-sodium; treatment 2 (T2), dazomet; treatment 3 (T3), calcium cyanamide; treatment 4 (T4), 1,3-dichloropropene; and treatment 5 (T5), methyl bromide] promoted significantly the biomass, root growth, and root respiration rate of M. hupehensis seedlings and the ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3–-N) contents of replanted soil. Metham sodium (T1) and dazomet (T2) had stronger effects compared with 1,3-dichloropropene (T4) and calcium cyanamide (T3). At 172 days after T1, the height, root length, and root respiration rate of Malus hupehensis Rehd. seedlings, and the NH4+-N and NO3–-N contents of replanted soil increased by 91.64%, 97.67%, 69.78%, 81.98%, and 27.44%, respectively, compared with the control. Thus, dazomet and metham sodium were determined to be the optimal fumigants for use in practical applications.

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“…Several short-term studies on the recovery of soil microbial communities in fumigated fields concluded that soil microbial communities make a relatively rapid recovery (less than a year) after the application of fumigants [9][10][11][12]. However, there are limited studies on the effect of long-term, repeated application of fumigants on soil microbial communities.…”

Section: Introductionmentioning

confidence: 99%

Effect of Long-Term Continuous Fumigation on Soil Microbial Communities

et al. 2017

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High value crop producers in California rely heavily on soil fumigation to control a wide array of soil borne pests including nematodes, pathogens and weeds. Fumigants with broad biocidal activity can affect soil microbial communities that contribute to nutrient cycling and plant nutrient uptake which can impact soil health. It is often thought that soil microbial communities make a relatively rapid recovery following fumigation. However, recently it has been found that repeated application of fumigants over time can have greater and longer lasting impacts on soil microorganisms than single fumigation events. Therefore, the main objective of this study was to determine the effect of long-term repeated application of fumigants on soil microbial communities and compare them with non-fumigated and organic sites. Soil samples were collected from fields in Watsonville, CA. Chronosequence sites were defined by number of years of annual fumigation (yaf) with methyl bromide (15, 26, 33, 39 yaf) at the time of sampling, and representative non-fumigated sites were also included for comparison. Phospholipid fatty acid (PLFA) analysis was used to analyze the samples. The canonical variate analysis showed that microbial communities in sites with a longer history of fumigation (33 and 39 yaf) were similar to one another; however, they differed significantly from 15 yaf site and further analysis concluded that non-fumigated sites were significantly different than fumigated sites. This study showed that the proportion of arbuscular mycorrhizal fungi (AMF) was lower in all fumigated (15, 33 and 39 yaf) sites as compared to their non-fumigated counterparts, which could be a threat to sustainability since AMF plays a major role in soil health and quality.

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Soil Microbial Community Structure and Target Organisms under Different Fumigation Treatments

Cited by 26 publications

References 37 publications

Soil microbial community characteristics in a vineyard ten years after fumigation

Soil microbial community characteristics in a vineyard ten years after fumigation

Effects of Different Fumigants on the Replanted Soil Environment and Growth of Malus hupehensis Rehd. Seedlings

Effect of Long-Term Continuous Fumigation on Soil Microbial Communities

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