
die Aussaat
sowing
The process of sowing; the spreading of seeds in fields or gardens.
Im Frühling beginnt für die Landwirte die Zeit der Aussaat.
In spring, the sowing season begins for farmers.
sowing / seed
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sowing
The process of sowing; the spreading of seeds in fields or gardens.
Im Frühling beginnt für die Landwirte die Zeit der Aussaat.
In spring, the sowing season begins for farmers.

seed
The seed itself; the quantity of seeds intended for sowing.
Der Bauer hat die Aussaat für das nächste Jahr bereits im Lager.
The farmer already has the seed for next year in storage.
'Die Aussaat' (sowing/seed) is the noun form of the separable verb 'aussäen' (to sow). It describes both the action of sowing and the material, meaning the seeds themselves.
Die Bauern säen im Frühjahr den Weizen aus.
The farmers sow the wheat in spring.
You can tell whether the action ('das Säen' — sowing) or the material ('die Samen' — the seeds) is meant from the verb. Verbs like 'beginnen' (to begin) or 'vorbereiten' (to prepare) refer to the action, while verbs like 'kaufen' (to buy) or 'lagern' (to store) refer to the seed.
Die Aussaat muss vor dem nächsten Regen abgeschlossen sein.
The sowing must be completed before the next rain.
'Aussaat' belongs to the word family around 'säen' (the verb) and 'die Saat' (the seed). These words are also often used figuratively, for example when someone 'sows' an idea or when a plan 'comes up' like seed.
Mit seinen kritischen Fragen hat er den Keim des Zweifels gesät.
With his critical questions, he sowed the seed of doubt.
seed
Saatgut refers to seeds as material or as a supply for cultivation. Aussaat can also refer to seeds, but in that case it tends to mean the quantity intended for a specific sowing operation. Saatgut is therefore usually the better choice for storage and trade, while Aussaat can also refer to the allocated quantity.

Die Aussaat für das Nordfeld ist bereits abgewogen und steht in Säcken bereit.
The seed for the northern field has already been weighed out and is ready in sacks.
Das Saatgut für das Nordfeld lagert bis zum Frühjahr in trockenen Säcken.
The seed for the northern field will be stored in dry sacks until spring.