M.-h. Jeuffroy

We evaluated the Azodyn wheat crop model as a cultivar decision support tool using a set of 14 ge... more We evaluated the Azodyn wheat crop model as a cultivar decision support tool using a set of 14 genotypes, tested in 21 contrasting environments. The results showed that the Azodyn crop model satisfactorily simulated yield and grain protein content for a large range of genotypes and environments, as shown by a root mean square error of 1.4 Mg ha -1 and 1.7 g 100 g MS -1 , respectively. The comparison between the observed and the simulated rankings of genotypes showed a ranking error of the model of one rank or less. The model was able to identify the best genotype to be used to obtain the highest yield in 20 cases out of 33 and the highest grain protein content in 48 cases out of 64. As a new way to evaluate crop models as a decision support tool for cultivar choice, we compared the Azodyn predictive accuracy against the cultivar yield and grain protein average generally used by cultivar growers as a predictive model. We showed that in the main production conditions, the Azodyn predictions fit the yield and grain protein content observed better than the average. crop model / cultivar / decision support tool / cultivar users / model evaluation

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The assessment of Azodyn-Org model for managing nitrogen fertilization of organic winter wheat

European Journal of Agronomy, 2005

In organic wheat, nitrogen is one of the key limiting factors responsible for irregular productiv... more In organic wheat, nitrogen is one of the key limiting factors responsible for irregular productivity and low quality. On arable farms, the decreasing use of N-organic sources such as forage legumes, manures and composts relative to mixed-farms requires the development of suitable fertility strategies based on the use of off-farm organic fertilizers. The Azodyn crop model was previously adapted to

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Modelling for durable resistance of canola to blackleg: combining management strategies for a collective disease control at a regional scale

Diversifying cereal crop rotations notably with peas and rapeseed - Recent experiment and study data | Diversifier les rotations céréalières notamment avec du pois et du colza - Données récentes d'expérimentations et d'études

Deviation from the grain protein concentration-grain yield negative relationship is highly correlated to post-anthesis N uptake in winter wheat

by Pierre Martre and M.-h. Jeuffroy

Journal of Experimental Botany, 2010

In plants, carbon and nitrogen (N) economies are intimately linked at the physiological and bioch... more In plants, carbon and nitrogen (N) economies are intimately linked at the physiological and biochemical level. The strong genetic negative correlation between grain yield and grain protein concentration observed in various cereals is an illustration of this inter-relationship. Studies have shown that deviation from this negative relationship (grain protein deviation or GPD) has a genetic basis, but its physiological basis is still poorly understood. This study analysed data on 27 genotypes grown in multienvironment field trials, representing a wide range of agricultural practices and climatic conditions. The objective was to identify physiological processes related to the genetic variability in GPD. Under most environments, GPD was significantly related to post-anthesis N uptake independently of anthesis date and total N at anthesis. The underlying physiological trait might be related to genotypic differences in either access to soil N, regulation of N uptake by plant N status, or ability to maintain root activity during the grain-filling period. GPD is an interesting potential target in breeding as it appears to be relatively robust across different environments and would be valuable in increasing total N uptake by maturity.

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Characterization of Environments and Genotypes for Analyzing Genotype × Environment Interaction

Journal of Crop Improvement, 2005

Genotypes ϫ environment interactions (GEI) are more fully analyzed when genotypes and environment... more Genotypes ϫ environment interactions (GEI) are more fully analyzed when genotypes and environments are well character-M. Leflon and M. Brancourt-Hulmel are affiliated with INRA Unité de Génétique et d'Amélioration des Plantes, Estrées-Mons, BP 136 80203 Péronne Cedex, France. C. Lecomte is affiliated with INRA, Station de Génétique et d'Amélioration des Plantes,

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The effect of various dynamics of N availability on winter pea–wheat intercrops: Crop growth, N partitioning and symbiotic N2 fixation

Field Crops Research, 2010

Cereal-legume intercrops are a promising way to combine high productivity and several ecological ... more

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Azodyn: a simple model simulating the date of nitrogen deficiency for decision support in wheat fertilization

European Journal of Agronomy, 1999

CITATIONS 67 READS 74 2 authors: Some of the authors of this publication are also working on thes... more

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The end of flowering in pea: influence of plant nitrogen nutrition

European Journal of Agronomy, 1997

The effect of plant nitrogen nutrition was analysed on the end of flowering in pea. Plants were g... more The effect of plant nitrogen nutrition was analysed on the end of flowering in pea. Plants were grown in a glasshouse. Non-nodulated plants were fed a nutrient solution rich (14 meq l −1) in nitrogen. During various periods in the plant cycle the nutrient solution was replaced by a solution without nitrogen, resulting in various periods of nitrogen starvation. The

Nitrous oxide emissions from crop rotations including wheat, oilseed rape and dry peas

by M. Gosme and M.-h. Jeuffroy

Biogeosciences, 2013

The Azodyn crop model as a decision support tool for choosing cultivars

Agronomy for Sustainable Development, 2006

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The assessment of Azodyn-Org model for managing nitrogen fertilization of organic winter wheat

European Journal of Agronomy, 2005

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Modelling for durable resistance of canola to blackleg: combining management strategies for a collective disease control at a regional scale