Abstract: Mature plants of Prunus mume/ peach rootstock were fertilized with ¹⁵N-labelled ammonium calcium in autumn. Treatment with autumn application augmented 1¹⁵N-storage in roots and the perennial branches and promoted flower-bud differentation in winter. During shoot rapid-growing period , kernel absorbed more nitrogen than did the new shoots ; After then, ¹⁵N in the new shoots was recovered to perennial tissues , perennial organs-thickening became the growing-centre. The ¹⁵N concentration in the current branchs was higher than the perennial branchs , the storage N could promote the next year flower2bud differentation. The withdrawed ¹⁵N from falled organs was remobilized in near tissues during dormant period. In the following season , the withdrawed ¹⁵N was translocated to neworgans. The remobilization and distribution of N were highly correlated with the centre of growth and development in Prunus mume. The absorbed N following autumn application could be utilized for a long time.

Key words: Prunus mume, Nitrogen nutrition, Application, ¹⁵N-labelled ammonium calcium