Judul: Pemanfaatan SWA (super water absorbent) Pati Singkong untuk Meningkatkan Ketersediaan Air pada Tanaman Jagung (zea mays) di Tanah Bertekstur Liat
Abstrak: Water shortage for plant growth is one of the most problem in dry-land system agriculture. An attempt that can overcome this problem is application of water absorbent that can absorb amount water and increasing water supply for plant growth. SWA (Super Water Absorbent) cassava starch can be a choice for this purpose. This study was aimed to assess the effect of SWA cassava starch and its comparison to the other water absorbent, for corn plant growth in clay-textured soil (podsolik). The experiment applied Randomized Completely Design, and the treatment is irrigation ratio: each three days, each seven days and each fourteen days. The results showed that the use of SWA cassava-starch on each-fourteen-days-irrigation-ratio was significantly different on corn plant growth. Although this treatment gave a good result, but generally this treatment did not give a better result than each-three-days-irrigation ratio.
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Judul: Pengaruh SWA (Super Water Absorbent) Pati Singkong Terhadap Sifat Retensi Air Tanah
Abstrak: The development of dry-land agriculture often face some constraints, especially when it is related to water needs which is depending on rainwater. Global climate change, that occurs lately has made rainfall patterns become more erratic and less predictable. Therefore, new technology that could help maintaining soil water content is needed to ensure that water availability for plant growth is still sufficient. SWA (Super Water Absorbent) cassava starch is one of a technology that can be used for this purpose. This study was aimed to assess the effect of SWA cassava starch and its comparison to the other water absorbent, for maintaining soil water retention on two different soil textures (clay and sandy clay). The results showed that addition of SWA cassava starch was not significantly different from the other soil water absorbent for maintaining soil water retention. SWA cassava starch performance at clay textured soil was better than sandy clay-textured soil.
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Judul: Posisi Filogeni Orlitia borneensis dan Hieremys annandalei (Testudines) Berdasarkan Gen 16s rRNA
Abstrak: Urutan DNA mitokondria (mtDNA) banyak digunakan sebagai penanda molekuler dalam menentukan hubungan filogeni suatu organisme karena struktur organisasinya yang stabil. Seiring dengan kemajuan bioteknologi, pengelompokkan kura-kura Bataguridal masih menjadi perdebatan. Hal ini disebabkan oleh perbedaan karakter yang diamati. Beberapa hasil penelitian mengelompokkan kura-kura ini ke dalam famili Emydidae tetapi ada yang menempatkan kurakura ini ke dalam famili tersendiri yaitu famili Bataguridae. Pada penelitian ini digunakan urutan nukleotida gen 16S rRNA O. borneensis dan H. annandalei (Testudines) yang disejajarkan dengan urutan nukleotida beberapa spesies Testudines lainnya yang terdapat di Genbank. Hasil rekonstruksi pohon filogeni berdasarkan urutan nukleotida 16S rRNA menunjukkan bahwa O. borneensis dan H. annandalei berkerabat dengan Chinemys reevesi (famili Bataguridae). Hasil amplifikasi gen 16S rRNA O. borneensis dan H. annandalei menunjukkan komposisi nukleotida didominasi oleh nukleotida adenin dan timin dengan nilai perbandingan antara A/T dan G/C = 60.1%:39.9% untuk O. borneensis dan 63%:37% untuk H. annandalei. Rasio transisi terhadap transversi (ts/tv) gen 16S rRNA berkisar antara 0.67 sampai dengan 6.75. Nilai jarak genetik terkecil terjadi antara Trachemys scripta dan Chrysemys picta dan antara Dogania subplana dan Tracemys scripta yaitu sekitar 0.005 sedangkan nilai jarak genetik terbesar terjadi antara Pelomedusa subrufa dan Emydura subglobusa yaitu sekitar 0.869.
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