Development of ergosterol, microbial biomass C, N, and P after steaming as a result of sucrose addition, and Sinapis alba cultivation

Khan, Khalid Saifullah; Müller, Tanja; Dyckmans, Jens; Joergensen, Rainer Georg

doi:10.1007/s00374-009-0429-0

Cited by 10 publications

(6 citation statements)

References 54 publications

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“…The microbial residues, which comprise microbial exoenzymes, mucous substances, and dead microbial tissue (Khan et al 2010), were calculated as maize-derived soil organic C without POM-C and maize-derived microbial biomass C. Statistical analyses were carried out using SPSS statistical software (SPSS 15.0). The significance of experimental effects was tested by a two-way ANOVA in tables and by a one-way ANOVA in figures using the least significant difference (LSD) test (P<0.05).…”

Section: Calculations and Statistical Analysismentioning

confidence: 99%

“…Non-mycorrhizal mutants can be an important tool for studies on the interactions between AMF and other rhizosphere microorganisms without the demand for soil sterilization (Endlweber and Scheu 2006;Vestergård et al 2008) or pasteurization (Endlweber and Scheu 2006), which have strong impacts on soil chemistry and soil biology, by mobilizing nutrients such as N and P (Kahiluoto et al 2000;Endlweber and Scheu 2006) and by killing many other soil organisms (Khan et al 2010). The myc − mutants as nonmycorrhizal controls are available for tomatoes (Cavagnaro et al 2006) but also for peas (Duc et al 1989;Kleikamp and Joergensen 2006).…”

Section: Introductionmentioning

confidence: 99%

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Impact of pea growth and arbuscular mycorrhizal fungi on the decomposition of 15N-labeled maize residues

Jannoura

Kleikamp²,

Dyckmans

et al. 2011

Biol Fertil Soils

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A pot experiment was carried out (1) to compare C and N yield of different plant parts, nutrient concentrations, and root colonization between the non-mycorrhizal mutant P2 (myc − ) and the symbiotic isoline Frisson (myc + ), (2) to investigate the effects of arbuscular mycorrhizal fungi and growing pea plants on microbial decomposition of 15 Nlabeled maize residues, and (3) to follow the distribution of the added substrate over different soil fractions, such as particulate organic matter, soil microbial biomass, and microbial residues. Yields of C in straw, grain, and roots of myc + peas were significantly higher by 27%, 11%, and 92%, respectively, compared with those of myc − peas. The δ 13 C values in the different plant parts were significantly higher in myc + than in myc − tissue with and without maize. Application of labeled maize residues generally resulted in 15 N enrichment of pea plants. At the end of the experiment, the ergosterol concentration in roots of mature peas did not differ between the two isolines, indicating similar colonization by saprotrophic fungi. The decomposition of added maize residues was significantly reduced by the myc − peas, but especially by myc + peas. The formation of microbial residue C was increased and that of microbial residue N was reduced in the presence of plants. The insufficient N supply to soil microorganisms reduced decomposition of maize residues in the presence of peas, especially myc + peas.

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Section: Calculations and Statistical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of pea growth and arbuscular mycorrhizal fungi on the decomposition of 15N-labeled maize residues

Jannoura

Kleikamp²,

Dyckmans

et al. 2011

Biol Fertil Soils

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“…2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.plant-soil.com High application rates of mucilage increased root N content due to the depressive effects on plant growth. Not only may the high polyphenol content of coffee mucilage has depressive effects on plant growth (Contreras-Porras and Del Aguila, 2011), but high concentrations of easily soluble carbohydrates have also been repeatedly shown to reduce plant growth (Sulmon et al, 2007;Nieminen, 2009;Khan et al, 2010). However, any plant growth-depressing effects of coffee mucilage might be useful to reduce weed-growth near coffee plants, above a certain threshold in height.…”

Section: Plant Developmentmentioning

confidence: 99%

Coffee mucilage impact on young coffee seedlings and soil microorganisms

Castaño

Jannoura

Joergensen

2019

J. Plant Nutr. Soil Sci.

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A greenhouse pot experiment was carried out to assess the effects of fermented coffee mucilage applied as mulch together with maize leaves on the growth of young coffee plants of two different varieties and on soil microbial biomass indices. The coffee variety Catuai required 32% more water per g plant biomass than the variety Yellow Caturra, but had a 49% lower leaf area, 34% less shoot and 46% less root biomass. Maize and mucilage amendments did not affect leaf area, shoot and root yield, or the N concentration in shoot and root dry matter. The amendments always reduced the water use efficiency values, but this reduction was only significant in the maize+mucilage‐14 (= 14 g mucilage pot−1) treatment. Soil pH significantly increased from 4.30 in the control to 4.63 in the maize+mucilage‐14 treatment. Microbial biomass C increased by 18.5 µg g−1 soil, microbial biomass N by 3.1 µg g−1 soil, and ergosterol by 0.21 µg g−1 soil per g mucilage added pot−1. The presence of mucilage significantly reduced the microbial biomass‐C/N ratio from a mean of 13.4 in the control and maize treatments to 9.3, without addition rate and coffee variety effects. The application of non‐composted mucilage is recommended in areas where drought leads to economic losses and in coffee plantations on low fertility soils like Oxisols, where Al toxicity is a major constraint.

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“…Soil steam disinfection (SSD) technology can efficiently kill fungi, bacteria, and pests under the condition of soil cultivation for facility agriculture [1][2][3][4], which can solve the problem of continuous 2 of 22 cropping in high-value crop cultivation [5][6][7]. Experts around the world found that the injection SSD method has the advantage of higher heating rate for deep soil [6][7][8][9][10][11][12][13][14][15]. But for the disinfection of clay-loam in Yangtze River delta (China), because of its soil clay content and small soil pores which cause poor water permeability [16,17], the SSD injection method under clay-loam conditions will seriously affect the diffusion range of steam in the dense soil [18,19], resulting in poor disinfection efficiency and increased energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Spacing of Steam-Injecting Pipes on the Energy Consumption and Soil Temperature Field for Clay-Loam Disinfection

2019

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Soil steam disinfection (SSD) technology is one of the effective means to eliminate soil-borne diseases, especially under the condition of clay-loam soil cultivation for facility agriculture in Yangtze River delta (China). With the fine particles, small pores and high density of the soil, the way of steam transport and heat transfer are quite different from those of other cultivation mediums, and when using SSD injection method, the diffusion of steam between pipes will be affected, inhibiting the heat transfer in the dense soil. Therefore, it is necessary to explore the influence of steam pipe spacing (SPS) on the energy consumption and soil temperature (ST) for clay-loam disinfection. The best results are to find a suitable SPS that satisfies the inter-tube steam that can be gathered together evenly without being lost to the air under limited boiler heating capacity. To this purpose, we first used a computational fluid dynamics model to calculate the effective SPS to inject steam into deep soil. Second, the ST, ST rise rate, ST coefficient of variation, and soil water content variation among different treatments (12, 18, 24, or 30 cm pipe spacing) were analysed. Finally, the heating efficiency of all treatments depending on the disinfection time ratio and relative energy consumption was evaluated. The result shows that in the clay-loam unique to Southern China, the elliptical shape of the high-temperature region obtained from the numerical simulation was basically consistent with the experiment results, and the ratios of short diameter to long diameter were 0.65 and 0.63, respectively. In the SPS = 12 and 18 cm treatments, the steam completely diffused at a 0–20 cm soil layer depth, and the heat transfer was convective. However, at an SPS = 12 cm, steam accumulation occurred at the steam pipe holes, causing excessive accumulation of steam heat. The relative energy consumptions for SPS = 30, 24, and 12 cm were above 2.18 kJ/(kg·°C), and the disinfection time ratio was below 0.8. Thus, under a two-pipe flow rate = 4–8 kg/h, the inter-tube steam was found to be completely concentrated with a uniform continuous high temperature distribution within the soil for an appropriate SPS = 18–22 cm, avoiding the unnecessary loss of steam heat, and this method can be considered for static and moving disinfection operations in the cultivated layer (−20–0 cm) of clay loam soil. However, for soil with higher clay contents, the SPS can be appropriately reduced to less than 18 cm. For soil with lower clay contents and higher sand contents, the SPS can be increased to more than 22 cm.

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Development of ergosterol, microbial biomass C, N, and P after steaming as a result of sucrose addition, and Sinapis alba cultivation

Cited by 10 publications

References 54 publications

Impact of pea growth and arbuscular mycorrhizal fungi on the decomposition of 15N-labeled maize residues

Impact of pea growth and arbuscular mycorrhizal fungi on the decomposition of 15N-labeled maize residues

Coffee mucilage impact on young coffee seedlings and soil microorganisms

Influence of the Spacing of Steam-Injecting Pipes on the Energy Consumption and Soil Temperature Field for Clay-Loam Disinfection

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