This is the 9097th most frequent Japanese word.
潤
"潤" means "moisture," "richness," or "benefit."
潤った refers to being moisturized or enriched here, indicating a positive effect of water on the field.
この雨で畑が潤った。
The rain moisturized the field.
潤す means to enrich or provide relief in this context, referring to an emotional or spiritual nourishment.
彼の音楽は心を潤す。
His music enriches the heart.
潤します here is used to mean boosting or improving, referring to the enhancement impact of assistance on the economy.