Tree breeding of teak results in selected clones with high growth. Intensive silviculture is required to support a large-scale clonal teak plantation. Appropriate spacing is one of the methods to increase forest plantation productivity. Research of teak clone spacing was conducted on a seven-year-old clonal teak plantation with randomized completely block design. The treatments tested in this study were four plant spacing distances, namely, 3 m × 3 m, 6 m × 2 m, 8 m × 2 m, and 10 m × 2 m. Results show that spacing had significantly different effects on diameter, height, bole height, branch angle, crown area, crown projections, volume, and competition index. However, the height growth did not exhibit any significant differences. The 10 m × 2 m spacing produced the best diameter growth, crown area, and competition index, but has a low volume per hectare and the lowest height of free branch and branch angle. Meanwhile, the 3 m × 3 m spacing will increase bole height and stand volume per hectare. This result suggests that spacing could improve the growth of teak clone but must be followed by intensification of proper maintenance to reduce branch angle and increase bole height.

Abstract. Rahmawati RB, Widiyatno, Hardiwinoto S, Budiadi, Nugroho WD, Wibowo A, Rodiana D. 2022. Effect of spacing on growth, carbon sequestration, and wood quality of 8-year-old clonal teak plantation for sustainable forest teak management in Java Monsoon Forest. Biodiversitas 23: 4180-4188. Lowland monsoon forest dominated by teak was one of the tropical forest types that can contribute to producing wood production, carbon storage, reduction of emissions, and other ecosystem services. Increasing teak forest productivity could be obtained through teak breeding to get superior teak clones with high diameter growth. Thus, spacing is an important consideration for optimizing the growth, carbon sequestration, and wood properties of teak. However, the study of the growth, carbon sequestration, and wood quality of teak was conducted separately. This research used a selected teak clone aged 8 years with RCBD design with 4 blocks as replications. There were four different spacing as treatments, namely 10 m x 2 m, 8 m x 2 m, 6 m x 2 m, and 3 m x 3 m. The results showed that spacing was a significant effect on DBH, tree height, bole height, carbon sequestration, and volume of teak clones aged 8 years. On the other hand, spacing didn’t significantly affect the physical and mechanical properties of wood. The wood quality test showed that the 6 m x 2 m spacing had high values of bending strength and compressive strength parallel. The highest percentage of heartwood was at a narrow spacing of 6 m x 2 m and did not differ significantly with wide spacing. This indicated that wide spacing was beneficial in terms of teak growth, but wide spacing didn’t significantly affect on wood quality of the teak.

Abstract. Nugroho A, Matra DD, Siregar IZ, Haneda NF, Istikorini Y, Rahmawati R, Amin Y, Siregar UJ. 2021. Early growth evaluation and estimation of heritability in a sengon (Falcataria moluccana) progeny testing at Kediri, East Java, Indonesia. Biodiversitas 22: 2728-2736. Sengon (Falcataria moluccana) is widely cultivated as a monoculture plantation in community forests that still poses a high risk of pest and disease attacks.  Although plants naturally show signs of resistance, there is still however a lack of understanding on the influence of relative plant resistance on growth due to environmental and genetic factors. This study was aimed to evaluate the early growth of a sengon progeny testing in Kediri, East Java and to estimate the genetic parameters with respect to its resistance and susceptibility to stem borer and rust disease. Progeny test was designed using randomized complete block design (RCBD) with four blocks as replications. Each block consists of 100 families which was grouped into two categories, 50 families for resistant group and 50 families for susceptible group. Observations were made at the age of 0 and 9 months after planting on 9 individuals per plot in each family. Growth characteristics were measured as germination (%), height (m), and diameter (cm). Results indicated that the sengon growth rate from resistant and susceptible plant groups showed a significant difference. Heritability values are classified as moderate, ranging between 0.107 to 0.133 and 0.102 to 0.150 for height and diameter variables, respectively. These information may be used for gradual selection by considering the appropriate intensity.

Penguasaan dan kemampuan mengakses teknologi digital menjadi hal yang wajar dan perlu saat ini. Masyarakat terdorong untuk adaptif menyesuaikan diri. Namun terjadinya kesenjangan digital (digital divide) menjadi salah satu faktor yang menghambat proses kegiatan yang dilakukan secara online. Termasuk hambatan yang ditemukan pada saat diadakannya pelatihan online. Penelitian ini bertujuan untuk memaparkan kesenjangan digital dalam pelatihan online pendamping proses produk halal yang diselenggarakan oleh Lembaga Pendamping Halal Universitas Pramita Indonesa. Pelatihan yang dilaksanakan secara online seharusnya mempermudah proses pelatihan sehingga lokasi pelatihan tidak lagi menjadi masalah karena registrasi dan penerbitan sertifikat halal kini berbasis website. Namun pada pelaksanaan pelatihan tidak semua calon pendamping mampu mengikuti instruksi saat simulasi dan praktek dengan memanfaatkan teknologi digital dengan lancar. Tidak semua calon pendamping berada dalam lokasi yang infrastruktur dan sarana prasarana tenologi digitalnya memadai. Metode penelitian ini menggunakan pendekatan kualitatif deskriptif dengan teknik pengumpulan datanya melalui penyebaran quesioner online dan  observasi langsung  terhadap 108 orang peserta Pelatihan Pendamping Produk Halal. Diperoleh first digital divide tertinggi terjadi pada ketersediaan fasilitas mengakses internet yang memadai yang dialami 11,1 % peserta pelatihan, sedangkan second digital divide tertinggi terjadi pada keterampilan dan pengalaman menggunakan teknologi digital oleh peserta pelatihan 70,8 % peserta pelatihan.  

Heritability values were estimated for three months old seedlings height and diameter of Sengon (Falcataria moluccana) grown in a progeny testing in Kediri, East Jawa, Indonesia. Totally 10.000 seedlings from 100 families were planted, consisting of 50 families from resistant mother trees to boktor pest (Xystrocera festiva) and gall rust disease (Uromycladium falcatariae) and other 50 families from susceptible ones. The progeny testing applied split-plot block design with four blocks, 100 families as sub-plot and resistance to pest and disease as main-plot, while observingnine seedlings as replications. Parameters observed were seedlings height and diameter. ANOVA showed that all treatments had significant and highly significant effects on all parameters. Interactions between block and families also interaction between block and resistance were highly significant. However, the heritability values of height and diameter were both low. These low heritability values at seedling stage were expected as Sengon woods are usually harvested at the age of 5 years. However, the highly significant effects of families on both growth parameters indicated that genetics have high contribution to the seedlings performances in the field.