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soil fertility; soil quality; productivity of the soil
「地味」 has another reading with different meanings.
plain; simple; subdued; sober
彼女かのじょは地味じみな服装ふくそうを好むこのむんだ。
She prefers plain clothes.
地味じみだけど大切たいせつな仕事しごとだと思うおもう。
I think it's plain but important work.
派手はでより地味じみなほうが好きすきだな。
I prefer plain over flashy.