Does crop diversification impact plant-soil interactions?

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Nitrogen cycle regulation and associated ecosystem services in agroforestry systems. A methodology linking field, lab and modeling experimentations in the context of climate change in Brittany (France)

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Anionic exchange membranes, a promising tool to measure distribution of soil nutrients in tropical multispecific plantations

International audienceEstablishing highly productive forest plantations or crops on poor soils requires appropriate management to ensure sustainable production. The current development of various ecological intensification practices calls for efficient tools to monitor their effects on agro-ecosystems. Ecological intensification such as an association between a N2-fixing tree species and a highly productive species, e.g. an acacia and a eucalypt, is an agro-ecological plantation design that can enhance nutrient cycling and preserve soil fertility in tropical and sub-tropical areas. In this study, Anionic Exchange Membranes (AEM) were used to assess in situ the effect of tree species on the availability and spatial variability of nitrate (N) and phosphorus (P) in pure Acacia mangium (A), pure eucalypt (E) and mixed-species treatments (MA-ME) in a randomized complete block design on a ferralitic arenosol. The results showed that the AEM detected the specific influence of tree species on N and P availability at the stand level as well as interactions between trees in the mixed-species treatment. Moreover, nutrients trapped using AEM were significantly correlated with N and P immobilized in the tree biomass. In the mixed stand, AEM made it possible to understand the specific impact of each tree species on N and P availability reflecting the respective biogeochemical mechanisms at work. This preliminary study showed that AEM are a promising tool that can be used in situ for intensive sampling in multi-local comparisons to highlight the effect of management practices on soil fertility as well as the relationships between vegetation cover and soil

Développer des espèces et des variétés permettant la reconception des systèmes de culture

Chapitre 5 Disponible gratuitement en ebookInternational audienc

Développer des espèces et des variétés permettant la reconception des systèmes de culture

International audienc

Nitrogen fertilization of intercropped cereal-legume: A potassium, sulfur, magnesium and calcium plant acquisition dataset

International audienceCereal-legume mixture is a well-known successful intercrop model for an efficient use of soil nutrients [1 , 2]. Effects of mineral N gradient on the acquisition of major nutrients: potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S) is presented. A greenhouse pot experiment was conducted with wheat (Triticum aestivum L. cv. Lennox) and white lupin (Lupinus albus L. cv. Feodora) grown as sole crops and intercropped along a soil mineral N gradient obtained by 15 N addition. Plants were harvested at flowering stage and dry weights of shoots and roots were measured. Potassium, calcium, magnesium and sulfur concentrations in shoots and roots were determined by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

Utilisation de la biocatalyse supportée pour la nutrition phosphatée des plantes à partir du phytate.

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Nitrogen fertilization of intercropped cereal-legume: A potassium, sulfur, magnesium and calcium plant acquisition dataset

International audienceCereal-legume mixture is a well-known successful intercrop model for an efficient use of soil nutrients [1 , 2]. Effects of mineral N gradient on the acquisition of major nutrients: potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S) is presented. A greenhouse pot experiment was conducted with wheat (Triticum aestivum L. cv. Lennox) and white lupin (Lupinus albus L. cv. Feodora) grown as sole crops and intercropped along a soil mineral N gradient obtained by 15 N addition. Plants were harvested at flowering stage and dry weights of shoots and roots were measured. Potassium, calcium, magnesium and sulfur concentrations in shoots and roots were determined by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)