堆肥・たい肥|たいひtaihi[1]atamadaka (head-high)

1. nouncompost; manure

• Related積み肥つみごえNeutralThe native-Japanese word for the same thing as 「堆肥」: fertilizer made by piling up straw or leaves to rot. Interchangeable, but less common.
• Related下肥しもごえNeutralFertilizer made from human waste (night soil); the emphasis is on the dung, unlike 「堆肥」, which is made by rotting straw and fallen leaves.
• Related厩肥きゅうひWrittenA written/formal term for manure made from livestock dung and bedding straw; the emphasis is on the animal droppings.
• Related積肥WrittenA spelling of 「積み肥」 with the okurigana dropped; the meaning is the same. Less common, and mostly seen in written prose.

Use 「堆肥」 for fertilizer made by piling up and rotting straw or leaves, as in 「堆肥を作る」. 「積み肥」 is the less common native-Japanese synonym; 「厩肥」 means livestock manure and 「下肥」 human-waste manure.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 藁わらや落ち葉おちばなどを積み重つみかさねて、腐くさらせて作つくった肥料ひりょう。