Judul: Pengaruh pemberian kapur dan protein aditif terhadap proses vermicompost limbah pasar dan sifat-sifat casting yang dihasilkan
Abstrak: Peningkatan jumlah penduduk menyebabkan kebutuhan lahan meningkat sehingga mengakibatkan penurunan luasan lahan yang subur untuk pertanian. Disamping itu juga menyebabkan peningkatan limbah yang dihasilkan. Penggunaan lahan sempit yang sangat intensif akan mengakibatkan kerusakan sifat-sifat tanah baik secara kimia, fisik dan biologi ditandai dengan menurunnya bahan organik tanah. Hal ini dapat diatasi dengan pemanfaatan limbah yang dihasilkan oleh manusia yaitu limbah organik. Salah satu sumber limbah organik adalah limbah pasar yang sebagian besar merupakan hasil pertanian. Limbah pasar yang dihasilkan berdampak terhadap pencemaran lingkungan jika tidak ada usaha untuk mempercepat proses dekomposisinya terutama limbah yang bersifat organik. Untuk menanggulangi permasalahan limbah ini diperlukan suatu teknologi pengomposan yang dapat mempercepat terdekomposisinya sehingga menjadi pupuk organik yang langsung dapat dimanfaatkan oleh tanaman pada pertanian lahan sempit. Vermicomposting (pengomposan dengan bantuan cacing tanah) merupakan salah satu proses pengomposan yang dapat mempercepat proses dekomposisi bahan organik. Vermicomposting mempunyai nilai ekonomis yang tinggi karena selain menghasilkan kompos (casting) yang kaya unsur hara juga menghasilkan cacing tanah yang mempunyai manfaat yang beragam…dst
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Judul: Pengaruh Pemberian Kapur dan Protein Aditif terhadap Proses Pengoposan Limbah Media Jamur Tiram dan Kualitas Vermikompos yang Dihasilkan
Abstrak: Agriculture intensification is increasing these days due to the lack of agricultural land. This intensification effort is highly potential in reducing soil organic matter and furthermore could decrease the properties of soil biology, chemistry, and physics. Adding more organic matter through processing organic waste, like waste of mushroom media is required to maintain soil organic matter. Composting is the efficient technology in processing organic waste into organic matter that can be added to soil. Besides producing good quality compost, vermicomposting will produce eathworms biomass to other usefulness. The objective of this research is to study the effect of lime and protein addition on the quality of vermicompost from waste of mushroom (Pleurotus ostreatus) media.
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Judul: Phylogenetic analysis of subgenus Dieramalpinia (Alpinia carolinensis clade) - Zingiberaceae based on ITS sequences
Abstrak: The most recent infra-generic classification of Alpinia Roxb. by Smith divided the genus into two subgenera (Alpinia and Dieramalpinia) with 11 sections and 12 subsections. One of the sections of Alpinia subgenus Dieramalpinia is Myriocrater which contains about 16 species. The most recent phylogenetic study that included species from Alpinia subgenus Dieramalpinia was done by Kress et al. (2007). They sampled only eight species and found that these were nested within a clade referred to as the Alpinia carolinensis clade. This clade was well supported and may be separated as a genus if sampling more species confirms the result. The objectives of the present project are to compare ITS within one species; to test the monophyly of Alpinia section Myriocrater; to test whether adding more samples still supports the Alpinia carolinensis clade. The present study included thirty-nine samples representing nineteen taxa from Alpinia; seven samples are still unidentified at species level. Sequences of the Internal Transcribed Spacer were used in the analysis. The result showed that ITS sequence of Myriocrater’s species are more conserved than another group in Zingiberaceae. There are base variations within species level. The Alpinia section Myriocrater plus five species from other section is not monophyletic. The Alpinia carolinensis clade still includes three sections of Smith classification (Dieramalpinia, Myriocrater and Pycnanthus) from subgenus Dieramalpinia. Alpinia subgenus Dieramalpinia section Eubractea and one species of section Dieramalpinia are separated into another clade.
Keyword: Alpinia, Myriocrater, Dieramalpinia, Alpinia carolinensis clade