Selection of adaptive teak provenance in Gunungkidul

The teak planting program for rehabilitation and research, as well as for social forestry purposes, requires a constant supply of planting materials with good phenotype and genetic qualities. Most of teak seeds in Indonesia are collected from seed production areas, and even from unidentified stands when the improved stands are unavailable. Vegetative material production from hedge orchards has also been used in a lesser number due to the more complex production techniques and the more expensive cost. Therefore, it is a need to look for any other alternatives for teak planting material supplies. The success of Wanagama on rehabilitation of critical land area suggested an idea to increase the value of Wanagama plantations as a seed source. A 31 years old provenance trial plantation PPGM-T73-88 consists of 21 provenances, located in Compartment 17 Wanagama, made in 5 blocks, 4 tree plots, and 4 m x 4 m spacing, was selected to be an alternative seed source. This study was aimed to evaluate the possibility of the plantation to be a seed source, by selecting the adaptive provenances based on survival rate, height, and diameter. This study concluded that Malabar and Central Province provenances have the highest survival rate. Kouai and Deling provenances are the highest rank of height and diameter characteristics. Respectively, the heights of both provenances are 14.58 m and 13.86 m; the diameters are 31.95 cm and 34.73 cm. Key words: teak, provenance trial, seed source, Wanagama. © 2020 IOP Publishing Ltd.