Grass complementary root traits of ryegrass (Lolium perenne L.) and tall fescue (Festuca aurundinacea Schreb.) improve yields in a low P soil. - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2023

Grass complementary root traits of ryegrass (Lolium perenne L.) and tall fescue (Festuca aurundinacea Schreb.) improve yields in a low P soil.

Résumé

Phosphorus (P) is one of the main nutrients used by grasses to reach high yields. However, P rocks are limited and overfertilization can lead to serious environmental damage. This motivates the introduction of smart combinations of grasses with the ability of accessing less soluble P pools in soils. In this field experiment, we cultivated Lolium perenne L. and Festuca arundinacea Schreb. in monocultures and in combination. Moreover, we also cultivated a combination of the latter species with a tetraploid variety of Lolium and Phleum pratense L. Plants were grown in an unfertilized low P sandy soil with and without P fertilization for two growing seasons. We measured biomass production, root traits, nutrient uptake, microbial biomass and enzymatic activities at the end of the experiment. We observed that, in the unfertilized plots, the combination of ryegrass and tall fescue generated the highest cumulative yields, relative total yield (RYT) and P nutrition index (PNI). These results can be explained by the complementarity found in root traits between Festuca and Lolium. Fescue showed higher root biomass (98.14 ± 18.6 g m-2) at deeper soil layers compared to ryegrass (43.85 ± 6.31 g m-2). On the other hand, ryegrass had finer roots than fescue both at top soil and bottom layers. The combination of 4 different grasses did not result in higher yields, however, soil C, microbial P biomass, alkaline phosphatase and β-glucosidase were increased in the unfertilized plots. Our results show that, at low P soils, combinations of grass species with contrasting root traits could lead to significantly higher yields than monocultures.
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hal-04579501 , version 1 (17-05-2024)

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  • HAL Id : hal-04579501 , version 1

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Ángel Velasco-Sánchez, Laura L.M.E Ferron, Nadia Laurent, Isabelle Trinsoutrot-Gattin, Jan Willem van Groenigen, et al.. Grass complementary root traits of ryegrass (Lolium perenne L.) and tall fescue (Festuca aurundinacea Schreb.) improve yields in a low P soil.. Wageningen Soil Conference, Aug 2023, Wageningen / Netherlands, Netherlands. ⟨hal-04579501⟩
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