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Master Thesis

Détermination des facteurs limitants du rendement grainier de la luzerne porte-graine par analyse d'un réseau d'essais

Abstract : The seed yield of alfalfa is very sensitive to agro-climatic variations, resulting in uneven in a yield in space and time. In order to better understand the causes of this variability, a trial network has been set up by FNAMS since 2012.The analysis of the yield components shows that the fluctuation is mainly due to the number of seeds per inflorescence (r = 0.435) (seeds/pod x pods/inflorescences) and the number of fruiting stems / m² (r = 0.235). The impact of climatic factors on these components explains about 50% of the variability. Precipitation, water deficit during flowering and the photothermal quotient 30 days before flowering have a negative effect on the development of these components. Pests like tychius affect the number of seeds per inflorescence. In addition, optimum temperatures between 20 and 30 ° C are required to promote pollinator activity. Moreover, the choice of the density of sowing, the spacing and the cutting are cultural practices that can be modified and adapted to favor the setting up of the components. However, the climatic conditions being variable from one year to another and from one region to another, it is necessary to adapt the cutting schedule, which seems to be the only practice that can limit stress during the flowering and optimize temperatures for pollinator activity.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-01887956
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Submitted on : Thursday, October 4, 2018 - 3:49:59 PM
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Dorian Lusson. Détermination des facteurs limitants du rendement grainier de la luzerne porte-graine par analyse d'un réseau d'essais. Sciences du Vivant [q-bio]. 2018. ⟨dumas-01887956⟩

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