Weed germination in the field - can it be predicted?

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Presentation transcript:

Weed germination in the field - can it be predicted? Ilse A. Rasmussen, DIAS Jesper Rasmussen, DAU

Weed germination in the field Registrations Results analysis using ”Weed Cast” Discussion

Locations of registrations

Registrations 3 years Weeds counted in spring barley fields 20 counts in each field 1 m apart at most 20 m between counts 1 - 2 times per week Number of most occurring species same plot every count Largest growth stage of each species

Results Climate from nearby stations Either mean of all counts in one field or split into 4 ”plots” of 5 counts Results from different fields where the same weed species were present

Germination of POLCO Plant number Day t R2 = 97.5 R2 = 98.2 Number of POLCO emerged in relation to temperaturesum or days Mean of 20 counts in one field

Germination of POLCO Temperature sum or number of days equally well suited for modelling emergence

Germination of POLCO t Day Percentage of POLCO emerged in 5 different fields April 1st: t = 0 and Day = 0 t: temperature sum (base 0)

Germination of POLCO Different sowing times, climate etc. Up to 100 day-degrees difference of 50% germination Up to 14 days difference of 50% germination 100% germination app. the same Different slopes of the germination curve

Germination of CHEAL Germination of CHEAL in 4 plots in one field. 5 counts carried out in each plot. Largest distance between counts: 20 m

Prediction of germination If these models are general, it will be possible to predict when 50% of the weeds have emerged how large the total emergence will be The slope of the germination curves are different between fields between plots in one field

Relationship between germination of different species Germination of TRIIN and VIOAR in relation to POLCO in 3 different fields

Relationship between germination of species If germination was dependent only upon external input, the relationship between two species should be the same on all locations As this is not so, it seems that factors within the seeds interacted with the environment to give different germation curves

What do we need to do? Field monitoring? Lab or semi-field research? Can it be done at all?

Germination of POLCO - actual and prediction by WEEDCAST

Germination of POLCO - actual and prediction by WEEDCAST

Germination of CHEAL - actual and prediction by WEEDCAST

How do we fit the models? Base-temperature Soil types Soil moisture threshold