|Titre :||Using microwawe soil heating to inhibit invasive species seed germination (2017)|
|Auteurs :||Melissa De Wilde, Auteur ; Elise Buisson, Auteur ; Nicole Yaverkovski, Auteur ; Loïc Wilm, Auteur ; Livia Bieder, Auteur ; François Mesléard, Auteur|
|Type de document :||Article|
|Dans :||Invasive Plant Science and Management (10:3 July-September 2017)|
|Article en page(s) :||42-51|
|Mots-clés :||TdV ; Espèce envahissante ; Lutte physique ; Lutte écologique ; Graine ; Sol ; Germination|
|Mots-clés:||Bohemian knotweed, Fallopia x bohemica (Chrcek and Chrtkovà) J. Bailey ; giant goldenrod, Solidago gigantea Ait. ; jimsonweed, Datura stramonium L., Duration, germination inhibition, invasive plant species, power, microwave heating, seedbank seed depth, soil moisture|
Successful invasive plant eradication is rare, because the methods used target the adult stage, not taking into account the development capacity of a large seedbank. Heating by microwave was considered, because it offers a means w quickly reach the temperature required for loss of seed viability and inhibition of germination. Previous results were not encouraging, because homogeneous and deep-wave penetration was not achieved, and the various parameters that can affect treatment effectiveness were incompletely addressed. This study aimed to determine, under experimental conditions, the best microwave treatment to inhibit invasive species seed germination in terms of power (2, 4, 6kW) and duration (2, 4, 8 min) of treatments and depending on soil moisture (10%, 13%, 20%, 30%) and seed burial depth (2, 12cm). Three invasive species were tested: Bohemian knotweed, giant goldenrod, and jimsonweed. The most effective treatments required relatively high power and duration (2kW8min, 4kW4min, 6kW2min, and 6kW4min; 4kW8min and 6kW8min were not tested for technical reasons), and their effectiveness diminished with increasing soil moisture with germination percentage between 0% and 2% for the lowest soil moisture, 0% and 56% for intermediate soit moisture, and 27% and 68% in control treatments. For the highest soil moisture, only 2kW8min and 4kW4min reduced germination percentage between 2% and 19%. Occasiona1ly, germination of seeds located at the 12-cm depth was more strongly affected. Giant goldenrod seeds were the most sensitive, probably due to their small size. Results are promising and justify further experiments before developing a field microwave device to mat large volumes of soil infested by invasive seed efficlently and with reasonable energy requirements. Other types of soil, in terms of texture and argutie matter content, should be tested in future capermonts, because these factors influence soil water content and, consequently, microwave heating.