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Arbuscular Mycorrhizal Fungi and Nutrient Cycling in Cropping Systems

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Carbon and Nitrogen Cycling in Soil

Abstract

Soil nutrient cycling in the soil-plant system of crops relies on the effects of the agronomical practices on soil conditions, especially soil microbial population mediating soil carbon transformation (either mineralization or stabilization), nitrogen cycle including soil nitrogen transformation, uptake and return from plants, and nitrogen losses, and the fate of other elements mediating these trade-offs, including phosphorous.

Arbuscular mycorrhizal fungi (AMF) are widespread, soil-borne microbes living in an obligate symbiotic status with most of the land plants. Such symbiosis can bring considerable benefits to plant growth, uptake of nutrients, and soil conditions. However, such benefits are not frequently seen in the field since the agronomical practices, especially tillage and use of fungicides, impair its development, which can partly be overcome by inoculation. Also, the increase of CO2 concentration with climate change and nitrogen fertilization could negatively affect the AM benefit for the plant in the short term and increase the carbon cost for the plant when aggressive AMF are used. For such a reason, there is a need for long-term studies from the agronomical point of view on the role of field inoculation with AMF on both plant yield and soil conditions. Soil could be improved by the AMF inoculation in terms of redistribution of nutrients, augmented aggregation status, increase unstable soil organic carbon content, and reduction in carbon and nitrogen losses. In the present chapter, we will show the main agronomical benefit of inoculating AMF in cropped soils, along with results from field experiment and hints on the functioning of the plant-AMF symbiosis under field conditions. Perspectives of the use of and research on the arbuscular mycorrhizal technology under field conditions are also given.

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Abbreviations

Al:

Aluminum

AM:

Arbuscular mycorrhizal

AMF:

Arbuscular mycorrhizal fungi

C:

Carbon

Ca:

Calcium

DB:

Dry biomass

EMF:

Ectomycorrhizal fungi

ERM:

Extra-radical mycelium

Fe:

Iron

IRM:

Intra-radical mycelium

K:

Potassium

N:

Nitrogen

Na+ :

Sodium

NFB:

N2-fixing bacteria

O:

Oxygen

P:

Phosphorus

PGPR:

Plant growth-promoting rhizobacteria

Pi:

Inorganic phosphorus

Po:

Organic phosphorus

S:

Sulfur

SOC:

Soil organic carbon

SOM:

Soil organic matter

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Correspondence to Sergio Saia .

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Saia, S., Tamayo, E., Schillaci, C., De Vita, P. (2020). Arbuscular Mycorrhizal Fungi and Nutrient Cycling in Cropping Systems. In: Datta, R., Meena, R., Pathan, S., Ceccherini, M. (eds) Carbon and Nitrogen Cycling in Soil. Springer, Singapore. https://doi.org/10.1007/978-981-13-7264-3_4

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