Jati (Tectona grandis Linn.f) dikembangkan secara intensif di Indonesia terutama di Pulau Jawa dengan luas pengelolaan hutan tanaman ± 1 juta Ha. Di Asia Tenggara jenis ini ditanam pula oleh negara Philipina, Thailand, Malaysia, Laos, Vietnam bagian Selatan dan Myanmar dengan luas bervariasi. Namun demikian pengetahauan mengenai variasi morfologi dan pemanfaatan untuk kegiatan bioteknologi dan pemuliaan masih berkisar pada satu spesies saja yaitu Tectona grandis. Sedangkan spesies lain seperti Tectona abludens, Tectona hamiltoniana dan Tectona philiphinensis belum banyak diketahui.Penelitian dilakukan dengan mengambil sampel daun di 3 pengembangan jati di Pulau Jawa yaitu Cepu dan Randublatung Jawa Tengah, Nglambangan Bojonegoro Jawa Timur dan Ciamis Jawa Barat. Untuk Spesies Tectona abludens sampel daun diambil di daerah Dlingo, Bantul DIY dan Selang, Gunungkidul. Sedangkan untuk jenis Tectona philiphinensis lebih dalam dipelajari berdasarkan informasi yang diperoleh dari Kementrian Kehutanan Philipina dan untuk jenis Tectona hamiltoniana dilengkapi dengan data dan informasi dari Kementrian Kehutanan Myanmar. Sampel daun dari tiap jenis diambil 2 daun (daun muda dan daun tua) masing-masing 5 ulangan. Pengamatan terhadap bentuk duduk daun, jumlah tulang daun primer dan sekunder serta pola tulang daun didiskripsikan dan dibandingkan antara keempat spesies tersebut. Morfologi bunga, kulit batang, kayu, biji dan bentuk percabangan digunakan juga untuk melengkapi variasi morfologi masing-masing spesies. Variasi morfologi yang ada dipergunakan untuk mengetahui variasi empat spesies Tectona sp tersebut sehingga diketahui karakter-karakter tiap jenis yang berpeluang untuk dimanfaatkan dalam kegiatan pemuliaan pohon baik melalui pemuliaan konvensional atau bioteknologi.Tectona grandis memiliki morfologi yang lebih dekat dengan Tectona abludens, sedangkan Tectona hamiltoniana dan Tectona phillipinensis memiliki morfologi khas yang berbeda dengan lainnya. Beberapa karakter morfologi diantara keempat spesies tersebut berpeluang diamanfaatkan untuk kegiatan pemuliaan jati antara lain kelurusan batang, kemampuan adaptasi di lahan kering dan ketahanan terhadap penyakit.
Penelitian bertujuan untuk memanfaatkan dan memperoleh nilai tambah dari limbah padat bungkil nyamplung melalui pengomposan menggunakan beberapa starter, serta mengetahui karakter kimiawi kompos yang dihasilkan. Penelitian disusun dengan Rancangan Acak Lengkap (RAL) dengan 4 jenis starter sebagai perlakuan (biostarter isi rumen sapi, Prouponic Gb#1, EM4, Primadec C-15) masing-masing dengan 3 ulangan. Analisis 7 parameter sifat kimia dilakukan terhadap limbah bungkil nyamplung sebelum perlakuan dan kompos bungkil nyamplung setelah perlakuan, meliputi:
Nyamplung (Calophyllum inophyllum) is a potential type of non-timber forest product (NTFP) with high oil yield which is useful as an alternative renewable energy sources and herbal medicine-cosmetics. Result of population selection level in Java Island have been used to build Provenan Seed Stand (PSS) nyamplung in KHDTK Wonogiri (Central Java) as an improved seed source with high oil yield and fruit productivity. Seed become nyamplung part that is used as oil raw material which is strongly influenced by flowering and fruiting period. Information on flowering fruiting ability and period is needed to support the availability of raw materials in a sustainable supply for the nyamplung oil industry. Seed become nyamplung part that is used as oil raw material which is strongly influenced by flowering and fruiting period. Information on flowering fruiting ability and period is needed to support the availability of raw materials in a sustainable supply for the nyamplung oil industry. Observation of flowering and fruiting period focused on 465 individual trees in nyamplung PSS at KHDTK Wonogiri through monthly monitoring by calculated flowering fruiting individual tree during 5 years (2014-2018). The results showed that the flowering period of nyamplung in TBP Wonogiri varied during 2014-2018. Flowering and fruiting occurs almost throughout the year. However, the peak of flowering and fruiting occurs mostly in March-August (end of the rainy season to the middle of dry season). In general, the trend of flowering and fertilization increased in 2014-2016, then decreased in 2017-2018, which is thought to be influenced by the higher canopy density. The environmental factor that most influences flowering is number of rainy days, while fertilization of TBP was strongly influenced by temperature. The management of TBP require future action such: second thinning, top pruning, application of fertilizers and hormones to stimulate flowering, and further detailed observations of flowering fruiting stage and its interaction with microclimate.
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