Weed seeds ability to emerge on the soil surface

Abstract : Annual weeds have to produce seeds each year to maintain their populations. These seeds fall on the soil surface. Seeds exposed to light during their moistening (i.e. caused by rain) better germinate than seeds in the darkness (i.e. buried). However, rare studies quantified the unique and combined effects of light, moisture and burial depth on the germination process. We investigated, in a greenhouse experiment in 2014, the impact of seed moisture (Moistened vs. Dried), light during moistening (Darkness vs. Light) and burial depth (Buried vs. Surface) on germination of 12 annual weed species contrasted on their seed traits and germination periods (Alopecurus myosuroides Huds., Amaranthus retroflexus L., Avena fatua L., Bromus sterilis L., Capsella bursapastoris (L.) Medik., Cyanus segetum L., Chenopodium album L., Geranium dissectum L., Poa annua L., Sonchus asper (L.) Hill, Veronica persica Poir., Vulpia myuros (L.) C.C.GME L.). Six modalities were tested (with 5 replicates): MDS (moistened seeds in darkness and then placed on the soil surface), MLS (moistened in light and placed on the surface), DLS (dried in light and placed on the surface), MDB (moistened in darkness and then 0.5 cm-buried), MLB (moistened in light and 0.5 cm-buried), DLB (dried in light and 0.5 cm-buried). Datasets were analysed with generalized linear model (GLM, binomial distribution).
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Submitted on : Tuesday, September 11, 2018 - 11:44:15 AM
Last modification on : Wednesday, September 12, 2018 - 1:11:48 AM

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  • HAL Id : hal-01871771, version 1

Citation

Stéphane Cordeau, Daphné Lizon Au Ciré, Carole Reibel, Florence Strbik, F. Duguet, et al.. Weed seeds ability to emerge on the soil surface. 17th European Weed Research Society Symposium. “Weed management in changing environments", Jun 2015, Montpellier, France. ⟨hal-01871771⟩

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