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: Pemanfaatan Water Absorbent untuk Meningkatkan Retensi Air Tanah dan Pertumbuhan Tanaman Jagung (Zea mays L.)
Abstrak: Water availability is one of principal problem in the system of dry-land farming, especially for food crops. Every plants needs constant water supply to grow, but this is not obtained in dry land farming that rely mainly on rain as a water resource. The lack of water availability in dry season caused decreasing of plant’s growth and productivity. In order to increase water availability, this research is using super water absorbent (SWA) from cassava’s starch to hold water and release it slowly. The purposes of this research are analyzing the impact of cassava’s starch SWA to the volume of water that is retained by soil and growth of corn (zea mays L). The result showed that application of water absorbent tend to increase the ammont of water retained by soil, eventhough the effect was not significant. Application of water absorbent result in significanly better corn growth as compared to control (no water absorbent). Nevertheless the application of water absorbent fail to maintain crop growth at optimum level. The treatment that retained most water is cassava starch SWA with 0.2 g/kg the dosages of spread mix in soil make every 14 days watering. While, application of cassava’s starch with 0.1 g/kg the dosages of concentrate in soil make every 14 days watering has a significant with the high and leaves’s wide, but not with the number it.
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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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