PRELIMINARY RESULTS ON THE GROWTH OF Sandoricum indicum Cav. IN PROVENANCE AND PROGENY TRIALS IN XUYEN MOC, HO CHI MINH CITY

Abstract

This paper presents the results of a growth evaluation of Sandoricum indicum Cav. in provenance and progeny trials established in Xuyen Moc, Ho Chi Minh city. The provenance trial included seven provenances originating from the Southeast, South Central, and Central Highlands regions of Vietnam, while the progeny trial consisted of 50 families established from seeds collected from selected plus trees. Evaluation after six years showed significant differences among provenances and families in survival rate and growth traits. Two promising provenances, Tay Ninh and Dong Nai, were identified, with mean annual increments ranging from 16.4 to 17.7 m³ ha⁻¹ year⁻¹, exceeding the trial mean by 34.9 - 45.3%. In addition, ten promising families (TN2, TN6, TN7, DN6, DN10, LD2, LD5, LD6, BP10, and BT9) were identified, achieving mean annual increments of 15.0 - 20.0 m³ ha⁻¹ year⁻¹, which were 45.8 - 94.2% higher than the trial mean. These findings provide an initial scientific basis for continued monitoring and evaluation of the growth stability of the selected provenances and families in subsequent growth stages, thereby supporting the genetic improvement program for Sandoricum indicum Cav.