ひりょう is the standard on'yomi. 肥 (ヒ) means to fertilize or enrich, and 料 (リョウ) means material or ingredient. ひりょうう adds an incorrect prolonged vowel, ひりょい misreads 料, and ひりょうん misreads the final sound. This term refers to fertilizer or manure, which are substances added to soil to increase its fertility and promote plant growth.

ひりょうは標準的な音読みです。肥は「肥やす」、料は「材料」の意味。土壌の生産力を高めるために与える物質です。ひりょううは不必要な長音、ひりょいは料の誤読です。