Substrate and quality mangosteen seedlings

Abstract An obstacle to the production of mangosteen seedlings (Garcinia mangostana L.) is the long nursery time of approximately two years. Among other factors, the identification of a suitable substrate for seedling production from this species is a preponderant factor to reduce nursery time. This study aimed to evaluate the growth of seminal mangosteen seedlings grown in four different substrate compositions. Growth rate was determined using the following variables: stem diameter, plant height, stem dry mass, leaf dry mass, shoot dry mass, root dry mass, total dry mass and Dickson Quality Index (DQI). The substrate S1 (sphagnum turf and vermiculite) was superior to substrates S2 (pinus bark and vermiculite), S3 (pinus bark and coconut fiber) and S4 (soil) in all evaluated parameters. The principal component analysis separated the treatments into three response groups, in which S1 exerted the greatest influence on the growth variables, concluding that this one of the substrates tested was the most adequate for the formation of mangosteen seedlings.

摘要 山竹（Garcinia mangostana L.）种苗生产的一大瓶颈为育苗周期长达约两年。在诸多影响因素中，适配该物种种苗培育的基质筛选是缩短育苗周期的核心影响因素之一。本研究旨在评估四种不同基质配比下培育的实生山竹苗的生长状况。本研究通过茎粗、株高、茎干质量、叶片干质量、地上部干质量、根系干质量、总干质量以及狄金森质量指数（Dickson Quality Index, DQI）等指标量化生长速率。结果表明，基质S1（水苔泥炭与蛭石）在所有评估参数上均显著优于S2（松树皮与蛭石）、S3（松树皮与椰糠）及S4（园土）。主成分分析将各处理组划分为三个响应集群，其中S1对生长指标的正向影响最为突出，由此证实在所测试的基质中，S1为山竹种苗培育的最优基质。