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All BBCH stages were determined based on Meier, U. (2001). BBCH Monograph. Federal Biological Research Centre for Agriculture and Foristry
[1] BLE (2022). ÖKOLOGISCHER HAFERANBAU. Bundesanstalt für Landwirtschaft und Ernährung. https://www.oekolandbau.de/landwirtschaft/pflanze/spezieller-pflanzenbau/getreide/hafer/
[2] Stöcke, M., Erkens, L. (2021).  ERFOLGREICH HAFER ANBAUEN.  Hauptsaaten für die Rheinprovinz GmbH. https://www.hauptsaaten.de/fileadmin/hauptsaaten/files/2021_Haferfibel.pdf

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Oats need to harvested qutie dry, not more than 14% moisture [1].

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Oat cyst nematode (Heterodera avenae) -> 6 year break between oat years
Fritfly (Oscinella frit) -> Early sowing [2]

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Puccinia coronata var. avenae -> Seeding date
Mildew -> Variety selection, sulfur
Seedborn diseases -> Seed hygene, seed treatment [1, 2]

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I assume weeds were removed by hand, since weed removal was effective and completely limited to the plot. Chemical weed control is very common in oats, I have no information whether the plot is managed organically or conventionally.

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Oats require 4-5°C to germinate. Early sowing allows mechanical weed control before germination.
[2]

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Cultivation not deeper than seeding depth (2-4cm) - preserve water availabilty.
Seeding densitity: 320 - 380 seeds/m² for march sowing.
[2]

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Grains start to fill with milky content

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Full sized grains, but still soft and wet

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Anthers are flowering (hard to see in the pictures)

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Inflorescence emerging

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4 nodes. Field poppy (Papaver rhoeas L.) dominant weed in surrounding plots. No infestation in oat plot.

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Weeds: Wild mustard Sinapis Avensis L. on the edges of the plot. Main area free of weeds.

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3 secondary nodes

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Oats have relatively little nutrient requirements. Nitrogen fertilization after tillering is possible. Giving it too late postpones flowering and increases risk of lodging [2].

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First secondary node ~3cm above tillering node

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2-3 tillers visible

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Uneven population density, weeds emerging

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First leaf unfolded, second leaf visible

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Avena Sativa L. was likely derived from the asian plant A. Sterilis and first cultivated in the late iron age.

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5 tillers

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Uneven development. Weeds have been removed.

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Uneven population density and development. Strong weed infestation (Best guess: Diplotaxis erucoides L.)