An object of the present invention is to provide a plant composition that is highly safe and contributes to early harvesting of crops, increase of yield, and improvement of added value. Specifically, it is to provide a yeast extract that exhibits plant growth promotion effect, root elongation effect, taste improvement effect, and amino acid content improvement effect by foliar application or addition to soil or water. As the yeast extract, a product obtained from yeast that has been eaten and has been confirmed to be safe is desirable. A plant is sprayed or fertilized with a yeast extract having a peptide content of 5% by weight or more and an RNA content of 5% by weight or more. It is desirable that the yeast extract is derived from Candida utilis, which has dietary experience and has been confirmed to be safe. [Selection figure] None【課題】本発明は、安全性が高く、かつ農作物の早期収穫や収量増加、付加価値向上に寄与する植物用組成物を提供することを課題とする。具体的には、葉面散布または土壌や水への添加により、植物の生長促進効果、根伸長効果、食味改善効果、アミノ酸含量向上効果を奏する、酵母抽出物を提供することである。酵母抽出物としては、食経験があり安全性が認められた酵母から得られる物が望ましい。【解決手段】ペプチド含量が５重量％以上、かつＲＮＡ含量が５重量％以上である酵母抽出物を植物に散布又は施肥する。酵母抽出物は、食経験があり安全性の認められたCandida utilis由来であることが望ましい。【選択図】なし
