Agroforestry-Based Land Management in the Food Estate Area of Ria-Ria Village, Pollung District, Humbang Hasundutan Regency, North Sumatra

Agroforestry is a land use pattern that combines agricultural and forestry crops on the same land with spatial and temporal arrangements. Ria-ria Village, Pollung District, Humbang Hasundutan Regency is one of the villages designated by the government to be one of the Food Estate areas in North Sumatra which is expected to be able to produce quality agricultural products that can be marketed not only locally but also outside the region. The management of this food estate needs an environmentally friendly concept for the sustainability of natural resources and the environment of the village area. Service activities carried out by socializing agroforestry patterns to the Tani Ria Kerja Community Group, planting trees with a hedge plant model around the land. The types of trees planted in this service activity are Avocado (Persea americana) and Suren (Toona sinensis)

PLANTING OF RHIZOPORA TYPES IN MANGROVE FORESTS PERCUT SEI TUAN NORTH SUMATERA

Mangrove forest is a tropical beach vegetation community dominated by several tree species that can grow and develop in tidal and muddy beaches. Some mangrove areas recently have been damaged due to illegal activities carried out by various parties, one of which is the East Coast of Sumatra in the Sub District Percut Sei Tuan, Deli Serdang District, Province of North Sumatra. The purpose of the activities is to focus on replanting mangrove lands that have been damaged by local species. The growned in Tanjung Rejo Village Percut Sei Tuan buds are like Rhizopora stylosa, Rhizopora apiculata and Avicennia marina type. Percentage of growing plants were R. stylosa (92.37%), R. apiculata (90%), mixed propagules of R. stylosa and R. apiculata (90%) and A. marina (56%) respectively. Overall the rehabilitation of mangrove forest is categorized as successful, but only one species of the smallest growing with percentage is A. marina (56%) this is because the location of  planting is adjacent to the sea where the plants can not stand the tidal currents

Agroforestry Land Management with the Community of Candi Rejo Village, Biru-Biru District, Deli Serdang, North Sumatra

Community Service Program in agroforestry land management together with the people of Candi Rejo of Village, Biru- Biru Sub-District, Deli Serdang, North Sumatra, aims to assist the community in managing agroforestry land to improve community skills in managing their agroforestry land. Some of the activities carried out are making compost using cocoa waste and animal husbandry, prunning cocoa plants to reduce pest and disease attacks and planting mindi, avocado, durian species for enrichment of species on agroforestry land. Based on the result of interviews with farmers that the use of compost is more effective in increasing cocoa production

LAJU INFILTRASI PADA BERBAGAI TIPE KELERENGAN DIBAWAH TEGAKAN EKALIPTUS DI AREAL HPHTI PT. TOBA PULP LESTARI SEKTOR AEK NAULI

ABSTACTThe objective of this research is know rate of infiltration on several slope. The research was carried out on December 2008 to January 2009 at area of HPHTI PT. Toba Pulp Lestari Tbk. Aek Nauli Sector. The research was use double ring infiltrometer to measure soil infiltration with three replication on each slope. The measurement was done in every five minute. The result of research show that the highest of infiltration rate and infiltration capacity was happened on slope 8-15%, ie 144 cm/hour and 24 cm/hour, while the lowest of infiltration rate and infiltration capacity was happened on slope 25-40%, ie 52 cm/hour and 16 cm/hour

Microbes Population and Soil Respiration Under The Kemenyan (Styrax spp) Stand Rhizosphere

The rhizosphere defined as zone surrounds the root that it physical, chemical, and biological character directly influenced by root activities. The rhizosphere is characterized by high microbiological activities compared to bulk soil and affected the plant performance. The objectives of this research were to determine soil respiration and total population of soil microbes, including fungi and bacteria, phosphate solubilizing microbes, and organic matter decomposer microbes. Soil samples were collected from rhizosphere zone (0-20 cm) of kemenyan bunga, kemenyan durame, kemenyan batak and kemenyan minyak in Pardomuan village, Sitellu Urang Julu-Pakpak Bharat, North Sumatera. Microbial population was calculated using plate count method and soil respiration measured using jar methods. The result showed that the highest fungi and bacterial population were found under kemenyan durame rhizosphere those were 13.4 x 107 and 15.7 x107 CFU mL−1. The highest phosphate solubilizing microbes population (96.8 x104 CFU mL−1) was also found in kemenyan jurame rhizosphere. The highest organic matter decomposer microbe found in kemenyan minyak rhizosphere those were 25.1 x104 (fungi) and 73.2 x 104 CFU mL−1 (bacteria). The highest respiration (3.23 mg CO2 100 g−1 day−1) was also found in kemenyan jurame rhizosphere.     Keywords: bacteria, fungi, kemenyan, respiration, rhizospher

Isolation and identification of cellulolytic fungi under Swietenia macrophylla, Mimusops elengi, and Polyalthia longifolia stands at the Universitas Sumatera Utara campus, Indonesia

The Universitas Sumatera Utara has various types of trees scattered in the surrounding environment. Swietenia macrophylla, Mimusops elengi and Polyalthia longifolia are the three most common tree species found on campus. To maximize the potential for utilizing tree species on the Universitas Sumatera Utara campus, several efforts can be made, one of which is by exploring the presence of cellulolytic fungi. Cellulolytic fungi are fungi that are able to hydrolyze cellulose which can produce cellulase enzymes. This study aims to obtain the potential and identify cellulolytic fungi from the soil under Swietenia macrophylla, Mimusops elengi and Polyalthia longifolia stands. Sampling was taken by making 3 plots on each type of stand measuring 20 m x 20 m with a soil depth of 0 – 20 cm. In each plot, 5 sampling points were made. The soil taken from each type is then composed. Isolation of cellulolytic fungi was carried out using Carboxy Methyl Cellulose (CMC) media. The potenstial of cellulolytic fungi is obtain by calculating the cellulolytic index. All isolates obtained were identified morphologically down to the genus level. The result showed that the potency of the cellulolytic fungi ranged from 0.05 to 1.36. The identification results that the isolates included the genus Aspergillus and Trichoderma

Status Dan Keanekaragaman Fungi Mikoriza Arbuskula (FMA) Pada Lahan Produktif Dan Lahan Non Produktif

Existence and status of the AMF is influenced by biotic and abiotic factors. This research aims to study and know the status and existence of Arbuscule Mycorrhizal Fungi (AMF) on the land productive and non productive land. Soil samples derived from the productive and non productive land in Tanjung Anom. This research uses the filter to get the spores and staining method to determine root colonization. Results showed that AMF colonization in productive land obtained 17.83% with an average density of 80 spores / 50g soil, and the percent of AMF colonization in non productive land obtained 42.76% with an average density of 89 spores / 50g soil. AMF spore types Glomus and Acaulospora on productive land obtained 13 spore types Glomus sp, and on non productive land obtained 14 spore types Glomus sp and 2 Acaulospora spore types. Total spore types were obtained 27 spore types, 25 types of spores Glomus sp and 2 Acaulospora sp spore types

Keanekaragaman Mikoriza Arbuskula (FMA) Pada Beberapa Tegakan Di Areal Arboretum Universitas Sumatera Utara

Existence and Status of Arbuscular Mycorrhizae Fungi is affected by biotic and abiotic factor. The goal of this research is to know diversity of Arbuskular Mycorrhiza Underneath of durian (Durio zibethinus), kemiri (Aleurithes moluccana), asam gelugur (Garcinia atroviridis), and karet (Hevea Brasiliensis). Soil sample has been taken from Arboretum Universitas Sumatera Utara under of four tree of MPTS. This research use soil separating method to obtain spores and root coloring method to find out root colonization. The obtained an average spore density on kemiri is 42 spores/50 g soil, durian is 42 spores/50 g soil, karet is 50 spores/50 g soil and asam gelugur is 62 spores/50 g soil. The result shows on four tree of MPTS obtained 23 spores types of Glomus and 8 spores types of Acaulospore with colonization percentage of durianis 25,6%, kemiri is 43,86%, Karet is 49,6% and Asam Gelugur is 50,5%