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It's a conversation from video game, people live in a flying saucer-like city (Shevat).
Context - これは、プラントシェルだよ。このなかでシェバトで必要な 野菜やら果物やらを育ててるのさ。今は大切な降土期だから、 関係者いがい立ち入り禁止さ。人間は、バイ菌のかたまりだからね。
土 is soil, earth.
降 is descend, fall.
So maybe 降土 means something like "planting"?
降土 is not a word ordinary people use. It's a made-up word, but it can instantly be understood as the 土 version of 降雨 ("rainfall") or 降雪 ("snowfall"). Thus "soilfall" or something like that.
