The siam weed (Chromolaena odorata L.) has allelochemical compounds capable in inhibiting the growth of surrounding plants so that it has the potential as a natural herbicide to control various weeds including autoallelopathic weeds. This study aims to examine the effect of siam weed leaf extract at different concentrations on germination and initial growth of the Siam weed seed. The study used a Completely Randomized Design of one factor in the form of extract concentrations of 0%, 5%, 10%, 15%, and 20%. Germination method was carried out on petri dish and observations are carried out every 24 hours, and the treatment was stopped after 100% germination occurred at least in one petri dish. Each treatment was done with five replications — parameters measured as a percentage of germination and germination rate, initial germination including hypocotyl length, radicula length, and fresh weight. Data were analyzed by Analysis of Variance (ANOVA) and continued with Duncan’s Multiple Range Test (DMRT) at 95% confidence level. The results of this study showed that the Siam weed extract inhibited germination and initial growth of the Siam weed seed sprout, the higher concentration of the Siam weed extract the highest, inhibition of germination and initial growth of the Siam weed seed.
Silvofishery application in Semarang was expected to provide several advantages for aquaculture activity, such as its support to the availability of natural food for Tilapia. This research aimed to analyze the suitability of Tilapia fish stomach content and the composition of plankton in the silvofishery pond in Semarang. Data collection included plankton abundance in A. marina and R. mucronata silvofishery plot and stomach content of Tilapia fish. Data were collected through field sampling occupying 6 silvofishery plot (3 for each vegetation type) and 6 fish samples (3 from each vegetation types). Water sampling was conducted by filtering 10 litres of water to 100 ml. Plankton identification was conducted in the laboratory. The result showed there were 7 plankton species found in the stomach content of Tilapia fish. Six similar species were found in the A. marina pond and only 5 similar species were found in R. mucronata pond. There was no similarity on the community structure of plankton found in the A. marina pond, R. mucronata pond and stomach content of Tilapia fish. The plankton abundance of A. marina plot was higher than the plankton abundance of R. mucronata plot.
Avicennia marina merupakan jenis mangrove yang sifatnya rentan terhadap perubahan lingkungan, sehingga secara langsung dapat mempengaruhi pertumbuhannya. Lebar saluran yang berbeda akan menentukan distribusi air dan nutrient sehingga dapat mempengaruhi kualitas air yang secara langsung mempengaruhi pertumbuhan vegetasi mangrove. Penelitian ini bertujuan untuk mengkaji kualitas air dan pertumbuhan semai Avicennia marina berdasarkan lebar saluran tambak yang berbeda. Metode yang digunakan dalam penelitian ini yaitu Rancangan Acak Kelompok (RAK). Analisis data yang digunakan berupa analisis varians (ANOVA) satu faktor dengan uji lanjut Duncan dan analisis deskriptif. Faktor yang digunakan yaitu lebar saluran. Saluran dengan lebar 1m, 2m, 3m dengan 6 ulangan. Hasil analisis sidik ragam terhadap kualitas air dan pertumbuhan semai Avicennia marina selama empat bulan pengamatan pada lebar saluran yang berbeda menunjukkan hasil yang tidak berbeda nyata. Berdasarkan hasil penelitian menunjukkan bahwa lebar saluran tambak yang berbeda berpengaruh terhadap kualitas lingkungan terutama suhu. Perlakuan lebar saluran tambak wanamina yang berbeda belum memberikan pengaruh yang nyata terhadap pertumbuhan diameter batang dan kelulushidupan semai Avicennia marina.
Mangrove seedling growth in silvofishery pond is limited to water quality dynamics while the water quality dynamically changes. This research aimed to study the changes of environmental factor condition in silvofishery pond and to analyze its impacts on the growth of mangrove seedling. Research experiment involved18 treatment plots with mangrove Rhizophora mucronata seedling. Observed parameters included temperature, turbidity, salinity, pH, DO, TSS, BO, N and P. Calculation was conducted for the deviation of each parameters. Mangrove growth parameters were including height and diameter growth while its data processing was absolute daily growth. Data analysis was conducted through regression. The result showed there were changes on environment parameters. Growth rate of R. mucronata showed variations on absolute daily height growth rate range of 0.215-3.333 mm/day (average 1.296 ±0.036 mm/day), while absolute daily diameter growth rate range was 2.15x10 -3 -0.196 mm/day (average 4.25x10 -2 ± 3.59x10 -2 mm/day). The analysis of regression showed several parameters effectedthe growth of mangrove seedlings including temperature, temperature change, turbidty, salinity change, pH, pH change, and DO on the growth of R. mucronata seedlings. This research concluded that environment parameters and its changes had significant effects on the growth of mangrove seedling.
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