This is the 12618th most frequent Polish word.
nawozu
"Fertilizer."
The word 'nawozu' is in the genitive case, indicating the object being added.
Rolnik dodaje nawozu do gleby, aby poprawić jej żyzność.
The farmer adds fertilizer to the soil to improve its fertility.
Here, 'nawozu' is also in the genitive case, denoting the quantity of fertilizer lacking.
Z powodu niewystarczającej ilości nawozu plony były słabe.
Due to the insufficient amount of fertilizer, the harvest was poor.
In this sentence, 'nawozu' is still in the genitive case, specifying the type of fertilizer being referenced.