Setyawan. 2018. Diversity of mangrove vegetation and carbon sink estimation of Segara Anakan Mangrove Forest, Cilacap, Central Java, Indonesia. Biodiversitas 19: 246-252. Mangrove forests are known as standing stores of sequestered atmospheric carbon. The role of mangrove forests in the sequestering substantial amount of atmospheric carbon dioxide (CO2) and storing the carbon in its biomass has been recently underscored. This research aimed to estimate vegetation diversity and carbon sink potential of Segara Anakan Mangrove Forest Cilacap, Central Java from August-December 2012. Vegetations sampling was done by square plots technique. Diversity index was utilized to determine species diversity. Allometric equations were used to estimate biomass and carbon sinks. This study only calculates aboveground biomass and carbon sinks. The research results showed that mangrove in Segara Anakan was composed of 24 species with 19 families, consisting of 16 species of trees, 14 species of saplings and 16 species of herbs. The most dominant tree was Avicennia marina with importance value of 43.62% in Kembang Kuning, 60.27% in Ujung Alang and 25.6% in Klaces. The most dominant of sapling was Avicennia marina, with an important value of 31.1%. The total biomass of a tree is about 43.06 kg/tree or 0.13 ton/ha. Total biomass of sapling was 27.38 kg/tree or 0.32 ton/ha. The carbon sink of the tree was 49.10 ton/ha and carbon sink of sapling was 79.39 ton/ha. It can be concluded that Segara Anakan Mangrove forest is very important as a carbon sink in South part of Central Java, Indonesia.
Sansevieria is an ornamental plant commonly known as mother-in-law's tongue, devil's tongue, and snake tongue. It has many functions e.g. uses as medicine, its fiber for the textile industry, and as indoor air pollutants absorber. However, the growth of Sansevieria is slow. Therefore the supply of it seeds in large quantities in the short time was difficult. The use of Plant Growth Regulator (PGR) was one solution to accelerate the propagation of Sansevieria leaf cuttings. This study aimed to determine the concentration of IBA and the composition of media to increase the leaf cuttings propagation of Sansevieria cylindrica var. patula. The method was randomized block design with factorials. Factor I was the IBA concentrations comprised of K0 at 0 ppm, K1 at 50 ppm, K2 at 100 ppm, K3 at 150 ppm, and K4 at 200 ppm. Factor II was the ratio of manure:sand:rice-husk-ash as the growth media, comprised of M1 with 1:1:1 ratio, M2 with 1:2:1 ratio, and M3 with 1:1:2 ratio respectively. Each with three replicates overall was 45 experimental units. The parameters observed were a percentage of propagated cuttings, the number of roots, the longest length of roots, the number of shoots. The results showed the IBA could not increase the growth of cuttings in all media composition; however media compositions could enhance the number of shoots. The effective media composition propagated the cuttings was the M1 a 1:1:1 ratio of manure:sand:rice-husk-ash.
The severity of plant disease is closely related to the development of the disease itself, including rusts caused by pathogenic fungi. This research aimed to determine the difference of rusts disease severity and to determine the correlation between rusts disease severity with the productivity of different varieties of soybean. The material used was inoculum of rusts pathogenic fungi, Phakopsora pachyrhizi Syd., and four varieties of soybean, i.e., Slamet, Lokon, Bromo, and Ringgit. This research was a split-plot design experimental with subplot was four different varieties of soybean, and the main plot was the control without the treatment of inoculation (In0). The spores suspension density of inoculum of P. pachyrhizi Syd applied was 104 spores/ml (In1). The main parameters observed in this study were the height of plants, the number of pods per plant, the number of seeds per plant, the wet and dry weight of the plant, and the total weight of 100 grains seed. The supporting parameters were the disease severity, the soil acidity, the humidity, and the air temperature. The results showed the plant with lowest rusts disease severity was Slamet variety (18,38%), and the highest was Ringgit variety (35,92%). The correlation test showed the increment of rusts disease severity reduced the number of pods and dry weight of the plant in Lokon variety.
Cabai (Capsicum annum L.) merupakan komoditas hortikultura yang memiliki peran penting dalam memenuhi kebutuhan pangan di Indonesia. Hal ini dikarenakan cabai dapat dikonsumsi dalam keadaan segar atau olahan. Paklobutrazol merupakan salah satu zat penghambat tumbuh atau retardan yang peranannya menyebabkan nutrisi dan energi tanaman akan diarahkan mencapai fase generatif lebih cepat, sehingga dapat meningkatkan produksi. Tujuan yang ingin dicapai pada penelitian ini adalah mengetahui pengaruh paklobutrazol dan GA3 terhadap pertumbuhan dan pembungaan cabai (Capsicum annum L.) dan menentukan konsentrasi paklobutrazol dan GA3 yang tepat terhadap pertumbuhan dan pembungaan cabai (Capsicum annum L.). Metode penelitian dilakukan secara eksperimental dengan Rancangan Acak Lengkap (RAL) pola perlakuan faktorial. Faktor pertama yaitu konsentrasi Paklobutrazol (P) dengan 4 taraf yaitu P0 : 0 ppm, P1 : 250 ppm, P2 : 500 ppm, dan P3 750 ppm. Faktor kedua yaitu konsentrasi GA (G) dengan 3 taraf yaitu G0 : 0 ppm, G1 : 50 ppm, G2 : 100 ppm dan G3 : 150 ppm. Kombinasi kedua faktor menghasilkan 16 pelakuan. Setiap kombinasi perlakukan diulang sebanyak 3 kali, sehingga terdapat 48 unit percobaan. Parameter yang diamati dalam penelitian ini adalah tinggi tanaman (cm), jumlah daun, waktu pembungaan (hari) dan jumlah bunga. Data yang diperoleh dianalisis dengan Analisis Ragam dengan tingkat kepercayaan 95% dan dilanjutkan uji Beda Nyata Terkecil (BNT) pada tingkat kesalahan 5%. Hasil penelitian menunjukkan bahwa pemberian Paklobutrazol dan GA3 berpengaruh pada pertumbuhan dan pembungaan tanaman cabai (Capsicum annum L.) apabila diaplikasikan secara mendiri. Paklobutrazol dengan konsentrasi 250 ppm dan GA3 dengan konsentrasi 50 ppm merupakan konsentrasi terbaik untuk pertumbuhan dan pembungaan pada tanaman cabai (Capsicum annum L.).
Tanaman Binahong (Anredera cordifolia) merupakan salah satu tanaman obat yang bermanfaat sebagai antioksidan. Kandungan senyawa aktif utama pada daun Binahong yaitu flavonoid yang merupakan salah satu senyawa golongan polifenol. Jenis flavonoid yang terkandung pada daun Binahong adalah flavonol. Penggunaan asam humat dapat meningkatkan kualitas media tanam sehingga pertumbuhan tanaman dapat meningkat. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh asam humat terhadap pertumbuhan dan kandungan polifenol daun Binahong dan menentukan konsentrasi asam humat yang efektif untuk meningkatkan pertumbuhan dan kandungan polifenol daun Binahong. Penelitian ini dilakukan di Greenhouse dan Laboratorium Fisiologi Tumbuhan Fakultas Biologi Universitas Jenderal Soedirman. Metode yang digunakan pada penelitian ini adalah metode eksperimental dengan menggunakan Rancangan Acak Lengkap (RAL) yang terdiri dari empat perlakuan asam humat pada media pasir dengan konsentrasi 0 g. kg-1; 4 g. kg-1; 8 g. kg-1; 12 g. kg-1 dan diulang sebanyak tiga kali. Parameter yang diamati pada penelitian ini adalah pertumbuhan tanaman meliputi jumlah daun, berat basah dan berat kering tanaman, serta kandungan polifenol pada daun Binahong. Data yang diperoleh dianalisis ragam atau Analisis of variance (ANOVA) dengan taraf uji 1%, kemudian dilanjutkan dengan uji Beda Nyata Terkecil (BNT) dengan taraf uji 5%. Hasil penelitian menunjukkan bahwa pemberian asam humat pada media tanam mampu meningkatkan pertumbuhan dan kandungan polifenol daun Binahong dengan konsentrasi 12 g.kg-1.
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