Abstract. Herawati E, Ramadhan R, Ariyani F, Marjenah, Kusuma IW, Suwinarti W, Mardji D, Amirta R, Arung ET. 2021. Phytochemical screening and antioxidant activity of wild mushrooms growing in tropical regions. Biodiversitas 22: 4716-4721. This study aims to determine the presence of secondary metabolites which generally have bioactivity that is antioxidant with phytochemical tests and antioxidant tests in Auricularia auricula, Schyzophyllum commune, Microporus xanthopus, and Trametes versicolor fungi that grow in the wild. Phytochemical analysis was carried out by testing color changes and modifications, while antioxidant tests were carried out by using a UV-Vis spectrophotometer and a DPPH solution (1,1-diphenyl-2-picrylhydrazyl). This research found that edible wood fungus that grows, wild such as A. auricula, contains secondary metabolites, namely flavonoids, triterpenoids, saponins, and tannins, but does not contain steroids, alkaloids, carotenoids, or coumarin, while S. commune contains secondary metabolites, namely flavonoids, steroids, tannins, and coumarin, but does not contain triterpenoids, alkaloids, carotenoids, or saponins and non-edible wood fungus, such as M. xanthopus, contains secondary metabolites, namely, flavonoids, saponins, tannins, coumarin, and steroids, but does not contain triterpenoids, alkaloids, or carotenoids, while T. versicolor contains compounds, secondary metabolites, flavonoids, saponin, tannins, coumarin, and triterpenoids, but does not contain steroids, alkaloids, or carotenoids. The antioxidant test results are based on IC50 calculations; it is known that the IC50 value of A. auricula is 499.25 g/mL, while S. commune is 121.37 g/mL, M. xanthopus is 251.20 g/mL, and T. versicolor is 493.04 g/mL. Based on the research results, edible and inedible wood mushroom extracts contain several phytochemicals and show potential for antioxidant activity.

Abstract. Marjenah, Kiswanto, Purwanti S, Sofyan FPM. 2016. The effect of biochar, cocopeat and saw dust compost on the growth of two dipterocarps seedlings. Nusantara Bioscience 8: 39-44. Good growing media contains enough nutrients, light textured, and have the capacity to hold water to create conditions that can support plant growth. The growing media used for propagation has several requirements, that is firm and dense to enhance the growth of stems, has the capability to hold water, guarantee the plant life, and moderate humidity. This study attempts to evaluate the effect of biochar, cocopeat, and saw dust compost on the growth of Dryobalanops aromatica and Shorea balangeran seedlings. An experiment was conducted by using completely randomized block design (CRBD) in factorial with two factors, namely growing media (top soil 100%; top soil 80% + saw dust compost 20%; top soil 80% + biochar 20%, top soil 80% + 20% coco peat ) and two species of dipterocarps seedlings (D. aromatica and S. balangeran). The experiment was carried out in a Forestry Faculty nursery during 3 months. To determine the best growth media, the vegetative parameters of seedlings were measured and the data were statistically analyzed. Survival rates of both of seedlings showed good specification in all types of growing media. The survival rates of D. aromatica for 100% top soil (control); 80% top soil+ 20% sawdust compost; 80% topsoil + 20% biochar; 80% top soil + 20% cocopeat are 100%; 100%; 97.78% and 97.78%; respectively. S. balangeran are 93.33%; 100%; 100%; 97.78%. Quality Index of D. aromatica 100% top soil (control); 80% top soil+ 20% sawdust compost; 80% topsoil + 20% biochar; 80% top soil + 20% cocopeat that are 0.15; 0.14; 0.10; and 0.10; and for S. balangeran 0.09; 0.38; 0.05 and 0.07 respectively.

Marjenah, Putri NP. 2017. Morphological characteristic and physical environment of Terminalia catappa in East Kalimantan, Indonesia. Asian J For 1: 33-39. Tropical almond (Terminalia catappa) is a large, spreading tree distributed throughout the tropics in coastal environments. The tree is tolerant of strong winds, salt spray, and moderately high salinity in the root zone. It is widely planted throughout the tropics, especially along sandy seashores, for shade, ornamental purposes, and edible nuts. The timber can be made into a useful and decorative general-purpose hardwood and is well suited for conversion into furniture and interior building timbers. Fruits are produced from about 3 years of age. The leaves change color from green to red, yellow or gold and copper brown during the dry season and then are shed. Terminalia catappa L. belongs to the family Combretaceae. This study aims to determine the morphological characteristics and physical environment of T. catappa. Habitat and to obtain T. catappa Linn. tree that produces the best biodiesel. The research object was a T. catappa trees planted as shade trees on the side of road in three regency/cities (Balikpapan, Samarinda, and Kutai Kartanegara), that are categorized in pursuance of the height above sea level. Data collected from each tree are Physical Environmental and Morphological Characteristics. The flushing, flowering, and fruiting are also observed, to determine the fruit/seed produced by a T. catappa tree.

Buah-buahan merupakan salah satu kebutuhan yang penting bagi manusia. Pada umumnya masyarakat hanya memanfaatkan daging buahnya saja, misalnya dibuat jus, selai, salad, sirup, dll. Sedangkan kulit buahnya hanya dibuang dan menjadi limbah. Penelitian ini bertujuan untuk mencari alternatif pemanfaatan limbah kulit buah-buahan dan mengetahui  unsur hara yang   terkandung di dalam pupuk organik cair (POC) yang bahan bakunya berasal dari limbah kulit buah-buahan. Penelitian ini dilaksanakan di Persemaian Fakultas Kehutanan Universitas Mulawarman dengan waktu ± 3 bulan efektif. Pola penelitian menggunakan 2 campuran bahan baku kompos yaitu limbah kulit buah nenas + limbah kulit buah naga (A) dan limbah kulit buah nenas + limbah kulit buah jeruk (B) dengan waktu pengambilan air lindi pada pekan ke-2, ke-4, dan ke-6 setelah kegiatan pengomposan. Hasil penelitian ini menunjukkan bahwa lindi yang berasal dari campuran kulit buah nenas + buah naga menghasilkan lindi yang lebih banyak (8.960 ml) dibandingkan lindi yang berasal dari campuran kulit buah nenas + kulit buah jeruk (6.551 ml). Kandungan unsur hara P tersedia pada lindi yang berasal dari campuran kulit buah nenas dan kulit buah jeruk hampir 8-10 kali lipat bila dibandingkan dengan standar mutu pupuk organik. pH lindi yang dari campuran kulit buah nenas + buah naga rata-rata 3,63 dan pH campuran kulit buah nenas dan kulit buah jeruk rata-rata 3,71; kedua-duanya masih di bawah angka standar mutu yaitu 4-9. Perlu dilakukan penelitian yang lain untuk mengaplikasikan pupuk organik cair yang dihasilkan.

Buah-buahan merupakan salah satu kebutuhan yang penting bagi manusia. Pada umumnya masyarakat hanya memanfaatkan daging buahnya saja, misalnya dibuat jus, selai, salad, sirup, dll. Sedangkan kulit buahnya hanya dibuang dan menjadi limbah. Penelitian ini bertujuan untuk mencari alternatif pemanfaatan limbah kulit buah-buahan dan mengetahui  unsur hara yang   terkandung di dalam pupuk organik cair (POC) yang bahan bakunya berasal dari limbah kulit buah-buahan. Penelitian ini dilaksanakan di Persemaian Fakultas Kehutanan Universitas Mulawarman dengan waktu ± 3 bulan efektif. Pola penelitian menggunakan 2 campuran bahan baku kompos yaitu limbah kulit buah nenas + limbah kulit buah naga (A) dan limbah kulit buah nenas + limbah kulit buah jeruk (B) dengan waktu pengambilan air lindi pada pekan ke-2, ke-4, dan ke-6 setelah kegiatan pengomposan. Hasil penelitian ini menunjukkan bahwa lindi yang berasal dari campuran kulit buah nenas + buah naga menghasilkan lindi yang lebih banyak (8.960 ml) dibandingkan lindi yang berasal dari campuran kulit buah nenas + kulit buah jeruk (6.551 ml). Kandungan unsur hara P tersedia pada lindi yang berasal dari campuran kulit buah nenas dan kulit buah jeruk hampir 8-10 kali lipat bila dibandingkan dengan standar mutu pupuk organik. pH lindi yang dari campuran kulit buah nenas + buah naga rata-rata 3,63 dan pH campuran kulit buah nenas dan kulit buah jeruk rata-rata 3,71; kedua-duanya masih di bawah angka standar mutu yaitu 4-9. Perlu dilakukan penelitian yang lain untuk mengaplikasikan pupuk organik cair yang dihasilkan.