Perum Perhutani has an important role in providing food and wood for people. Diversity and diversification of food will reduce the need for one type of food, namely rice as a staple food. Some tuber and rhizome are source of alternative foodstuffs, such as taro and arrowroot. This study aimed to determine the suitability and productivity of arrowroot and taro planted under old superior teak clones with several levels of stand density. Arrowroot and taro were planted under 14-year-old teak stands with 4 levels of density. Both plants were planted in the form of an array, measuring of 3m x 15m, with a spacing of 75cm x 75cm between plants. They were arranged in Randomized Completely with Block Design (RCBD) placed in 4 blocks of observation as replications.  The results showed that under superior teak clone had the potential to be planted with arrowroot and taro. Teak stand density influenced significantly some characteristics of arrowroot (leaves number, leaves area, stem height, stem diameter, root length) and taro (stem diameter, tuber diameter). Arrowroot productivity per hectare increased with low density of teak stands, accounted for 55, 59, 80, and 88 kg respectively. Meanwhile, taro productivity from very high to low teak density were 365, 301, 523, and 426 kg/ha. The novelty of this study is that there is no record of intercropping studies on old superior teak clones, so this is among the first studies. The benefit of from this research result, it could be employed by Perhutani to support the Indonesian government in the national food security program

Thinning is one of silvicultural management actions in maintaining and increasing growth and quality of standing stands. This study aims to determine growth response of selected teak clone to several intensities of thinning and intercropping. The method was a factorial completely randomized block design (RCBD) with thinning intensity (4 levels): 0% (control = A1), 25% (A2), 50% (A3) and 75% (A4) as the main plot, whileintercropping (2 levels), as the sub plot. The results showed that the Current Annual Increment (CAI) of diameter at breast height (CAI DBH), volume/tree (CAI vol/tree) and volume/hectare (CAI vol/ha) of stands gave a significant positive response to thinning intensity treatment. CAI DBH one year after thinning were 0.79 cm, 1.47 cm, and 2.46 cm; increased by 32%, 145% and 310% at the thinning intensity of 25%, 50% and 75% when they compared with the control (0.59 cm). CAI vol/ha of stand in the first year, namely 11.88 m3/ha, 14.04 m3/ha, and 16.78 m3/ha or with an increase of 9%, 29% and 54% respectively at an intensity of 25 %, 50% and 75% compared to the control.

Pertumbuhan tanaman dipengaruhi oleh faktor genetik dan faktor lingkungan. Salah satu faktor lingkungan yang sangat memengaruhi pertumbuhan adalah sifat kimia dan fisika tanah. Beberapa famili jati yang ditanam pada lokasi yang berbeda diduga mempunyai respon pertumbuhan yang berbeda pula. Penelitian ini bertujuan untuk mengetahui respon pertumbuhan (tinggi dan diameter) tanaman jati dari 30 famili yang ditanam pada dua lokasi yang berbeda, secara khusus untuk mengetahui pengaruh karakteristik sifat kimia dan fisika tanah pada pertumbuhan jati di dua lokasi tersebut. Metode penelitian yang dilakukan untuk mengukur pertumbuhan 30 famili jati yaitu tinggi total tanaman dan diameter setinggi dada. Sampel tanah diambil dengan terlebih dahulu membuat lubang profil tanah berukuran 1 m × 1 m dengan kedalaman 1 meter kemudian sampel diambil dari kedalaman 0-10 cm, 10-20 cm, 20-40 cm, dan 40-60 cm. Sifat kimia yang diamati adalah pH H2O, C Organik, N total, P, K, Ca, dan Mg tersedia serta Kapasitas Pertukaran Kation (KPK), sedangkan sifat fisik yang diukur adalah tekstur. Analisis statistik dilakukan dengan melakukan uji-t. Hasil penelitian menunjukkan parameter diameter tanaman, semua (30) famili tanaman jati menunjukkan perbedaan yang nyata di antara dua lokasi, sedangkan parameter tinggi hanya sebagian kecil famili yang berbeda nyata. Karakter kimia dan fisik tanah juga menunjukkan perbedaan nyata di antara dua lokasi. Parameter kimia tanah yaitu pH H2O, K, Ca, dan Mg tersedia, berbeda nyata antara 2 lokasi sedangkan kandungan C Organik, P tersedia dan KPK tidak berbeda nyata. Sementara dari sifat fisiknya, kandungan lempung dan debu pada dua lokasi berbeda nyata, sedangkan kandungan pasirnya tidak berbeda secara nyata. Perbedaan-perbedaan tersebut menunjukkan beberapa sifat tanah memang memengaruhi respon tanaman jati dalam hal pertumbuhan baik tinggi maupun diameternya. The Effect of Soil Chemical and Physical Characteristics on Growth of 30 Families of Teak (Tectona grandis) in a 10-year-old Progeny TestAbstractSome environmental factors that greatly affect plant growth are soil’s physical and chemical properties. Some teak families planted at different locations alleged to have different growth responses. This study aimed to investigate the growth response of teak (height and diameter) from 30 families, and to determine the effect of soil chemical and physical characteristics on teak growth in two different locations. Teaks were measured for total height and diameter at breast height. Soil pits (size: 1 m x 1 m and 1 m in depth) were dug and samples were taken from 0-10 cm, 10-20 cm, 20-40 cm and 40-60 cm in depth. Soil characteristics measurement were conducted on pH (H2O), organic carbon, total Nitrogen, available P, K, Ca, and Mg, also the Cation Exchange Capacity (CEC). Further, soil physical properties been measured was soil texture. Statistical analysis was performed by t- test. The results showed that teak’s diameter of all 30 families, showed significant differences between the two locations, while only a small proportion of height parameters significantly differed among families. Chemical and physical characters of the soil also showed differences between the two locations. Soil pH (H2O), available K, Ca, and Mg, were significantly differed between the two locations while the content of organic C, available P and the CEC were not significantly differed. For the soil physical properties, content of clay and silt in two location significantly differed whereas the sand content did not differ significantly. These differences indicate that some properties of the soil were affecting the growth response of teak famili in terms of both height and diameter.

Bambu petung banyak digunakan untuk bahan konstruksi bangunan karena sifatnya yang keras dan kuat. Pembiakan secara vegetatif menggunakan rimpang (rhizome), namun memiliki kelemahan, yaitu kesulitan dalam pembongkaran rumpun bambu. Oleh karena itu digunakan stek cabang,lebih praktis, bahan stekter sedia lebih banyak, mudah diperoleh, murah, tidak merusak rumpun asal, waktu pengambilan lebih cepat, dan pembentukan rumpun lebih mudah. Media pengakaran yang umum digunakan adalah top soil, namun pengadaan top soil dalam jumlah besar sulit, sehingga perlu dicari alternatif lain yaitu dengan mencampur media top soil dengan media lain. Media yang digunakan yaitu media tanah, arang sekam dan kombinasi tanah+arang sekam (2:1). Stek cabang bambu petung dengan umur pohon induk ± 2 tahun, diameter 2-3 cm dan panjang 2 ruas. Panjang tunas pada perlakuan media tanah, arang sekam dan kombinasi tanah+arang sekam menunjukkan berbeda di antara perlakuan. Jumlah tunas terbanyak terdapat pada perlakuan media arang sekam dan kombinasi tanah+arang sekam (3 tunas). Media campuran tanah+arang sekam menunjukkan panjang tunas terpanjang (37,11 cm), dan panjang akar terpanjang (17,5 cm). Media tanah dan arang sekam menunjukkan % berakar terbesar (86,67 %).Kata kunci: stek cabang, bambu petung, media tanah, arang sekam, pembiakan vegetatif. Growth of branches of petung bamboo (Dendrocalamus asper) grafting in soil media, husk charcoal, and their combinationAbstractRecently, the utilization of bamboo is more extensive, but the attention towards its regeneration is not sufficient. The use of stem or branch cuttings are more practical and having more benefits and promising because the cutting materials are more available, easier to gain, cheaper, undamaging the source clump, faster in the taking time, and easier in the clump formation. The common rooting media used is top soil (the fertile part of upper layer soil). Recently, it is quite hard to provide top soil in a large number. Thus, it is important to find an alternative source in order to decrease the use of top soil that is by mixing the top soil media with other materials. The media used were soil media, husk charcoal, and the mixture of soil and husk charcoal (2:1). The branch cuttings used were branches of petung bamboo taken from 2 years old amboo, with 2-3 cm in diameter, and 2 nodus in length. The treatment was done by giving some variations in the soil media, the husk charcoal,and the mixture of soil and huskcharcoal. The mixture of soil and huskcharcoal media gave a significant influencet o the length of sprout variable,but it did not give significant influence to the number of sprout, the length of root, and the percentage of rooting.

Most of the people live in Ngancar village, Pitu sub-district, Ngawi  district, East Java  are farmers. They cultivate crops not only on their privately-owned land but also on Perhutani’s forest land which is dominated by old teak stands. One of the problem in cultivating agricultural crops under old teak stands is the crown cover. It will significantly reduce the light intensity received by crops, and consequently decreasing the yield potential. Knowledge about the shade tolerant species and various silvicultural techniques should be understood and practiced by farmers, so that they can optimize the land use and achieve the high yield. Community service activities by Team of Silviculture Department, Faculty of Forestry UGM are carried out by establishing demonstration plot, maintenance, evaluation of plant growth and health, as well as problem identification and evaluation of successful cultivation under agroforestry system. Observation, focus group discussion, interview, questionnaire and counselling are implemented in order to collect related data and information. This community service activity uses descriptive qualitative approach. Outcome from this community service activity is recommendation of several shade tolerant species which can be cultivated under the old stands such as longan, avocado, and ginger. In addition, silvicultural treatment such as embroidery, weeding, and pest and disease control should be intensively managed  in agroforestry practice in order to achieve optimal yield productivity.