Penelitian bertujuan membandingkan sifat fisika tanah pada kebun karet dan kelapa sawit di Desa Betenung Kecamatan Nanga Tayap Kabupaten Ketapang. Sampel tanah diambil secara diagonal dengan mengambil sampel tanah utuh, sampel tanah agregat utuh dan contoh tanah terganggu. Sampel tanah di ambil pada kebun karet dan kelapa sawit dengan kedalaman 0-30 cm dan 30-60 cm. Hasil penelitan menunjukkan profil warna tanah pada kebun karet terdapat dua lapisan warna tanah yaitu 7,5YR 3/3 coklat gelap dan 7,5YR 6/8 kuning kemerahan. Profil warna tanah pada perkebunan kelapa sawit terdapat dua lapisan warna tanah, lapisan pertama 7,5YR 4/6 coklat gelap, lapisan kedua 7,5YR 6/8 kuning kemerahan. Struktur tanah kebun karet lapisan I remah, lapisan II dan III gumpal membulat. Struktur pada kebun kelapa sawit lapisan I remah, lapisan II gumpal bersudut, lapisan III gumpal membulat. Tekstur tanah kebun karet kedalaman 0-30 cm dan 30-60 cm termasuk lempung dan lempung berliat, pada kebun kelapa sawit kedalaman 0-30 cm dan 30-60 cm termasuk lempung liat berdebu. Hasil uji t bobot isi tanah kebun karet dan kelapa sawit kedalaman 0-30cm berbeda tidak nyata, kedalaman 30-60 cm berbeda nyata. Hasil uji t kadar air kapasitas lapangan kebun karet dan kelapa sawit kedalaman 0-30 cm dan 30-60cm berbeda tidak nyata. Hasil uji t porositas tanah kebun karet dan kelapa sawit kedalaman 0-30 dan 30-60 cm berbeda tidak nyata. Hasil uji t permeabilitas tanah kebun karet dan kelapa sawit kedalaman 0-30 cm dan 30-60 cm berbeda tidak nyata. Kemantapan agregat tanah lebih tinggi pada kebun kelapa sawit dibandingkan hutan karet, baik kedalaman 0-30 cm maupun 30-60 cm. Bahan organik pada kebun karet dan kelapa sawit tergolong rendah, baik pada kedalaman 0-30 cm maupun 30-60 cm, N-total rendah, dan C/N rasio rendah serta reaksi tanah (pH) masamKata kunci : Ultisols, Sifat Fisika Tanah, Kebun Karet dan Kelapa Sawit.

Entisols had a great potential for maize planting area expansion in increasing its production. The low soil fertility could be improved by application of coastal sediment. This current research examined the effect of different amount of coastal sediment on nutrient availability and maize production on Entisols, West Kalimantan. The research was conducted from July to November, 2013 in green house, Faculty of Agriculture, Tanjungpura University, West Kalimantan. The treatment conducted was the application of coastal sediment at dosage of: 0 Mg ha-1 (L 0), 14 Mg ha-1 (L 1), 28 Mg ha-1 (L 2), 42 Mg ha-1 (L 3), 56 Mg ha-1 (L 4), 72 ton ha-1 (L 5), 86 Mg ha-1 (L 6) and 100 Mg ha-1 (L 7). The treatments were arranged by completely randomized design with 3 replications. Research results showed that 42 Mg ha-1 coastal sediment was the best treatment and able to increase soil nutrients availability and maize productivity. The provision of coastal sediment increased the availability of K, Ca, Mg and Na, also the availability of nutrients in accordance with the increase of the dosage of coastal sediment.

Abstract. The strategies to meet the staple food needs in Indonesia is to open new paddy fields in the sub-optimal land. The research aims to get adaptive rice varieties with the highest yield on new openings of the acid sulfate tidal swamp applying mixed liming and NPK fertilizer. The experiment was conducted in a greenhouse at the Faculty of Agriculture, Tanjungpura University, Pontianak. The trials used a factorial completely randomized block design consisting of two factors. The first factor is a mixture of dolomite with NPK fertilizer, consisting of 3 levels (1 ton/ha dolomite and 60 kg/ha NPK; 2 ton/ha dolomite and 90 kg/ha of NPK, and 3 ton/ha dolomite and 120 kg/ha NPK). The second factor is rice varieties, consisting of 6 levels (Ciherang, Situ Bagendit, Inpara, Mira, Si Randah and Ringkak Janggut). Each treatment replicated four times. The results showed that the application of a mixture of 3 ton/ha dolomite and 120 kg/ha of NPK fertilizer showed the best results to improve rice yield on new opening of the acid sulfate tidal swap. Local rice varieties, Ringkak Janggut, applied 3 ton/ha dolomite and 120 kg/ha NPK fertilizer showed the best result of 1000 seed weight, i.e., 28.19 g, and total grain amount per panicle is 110.75 grains, with the lowest number of empty grains. Local rice varieties Ringkak Janggut potential to be developed as superior varieties on new opening acid sulfate tidal swamps by applying liming and fertilizer.

Entisols had a great potential for maize planting area expansion in increasing its production. The low soil fertility could be improved by application of coastal sediment. This current research examined the effect of different amount of coastal sediment on nutrient availability and maize production on Entisols, West Kalimantan. The research was conducted from July to November, 2013 (L 6 ) and 100 Mg ha -1 (L 7 ). The treatments were arranged by completely randomized design with 3 replications. Research results showed that 42 Mg ha -1 coastal sediment was the best treatment and able to increase soil nutrients availability and maize productivity. The provision of coastal sediment increased the availability of K, Ca, Mg and Na, also the availability of nutrients in accordance with the increase of the dosage of coastal sediment.

Indrayani Y, Suryanegara L, Sagiman S,, Roslinda E, Marwanto. 2019. Short Communication: Biodegradable of bio-composites made from Polylactic Acid (PLA) and cellulose fibers from oil palm empty fruit bunch. Nusantara Bioscience 11: 8-11. Over the last two decades, plastic has become an integral part of people's everyday life. However, plastic is a material that difficult to be degraded in the environment. Due to environmental concern, it is indispensable to find environmentally friendly plastic materials. This study aimed to determine the biodegradable polymer composites manufacture from cellulose fibers of oil palm empty fruit bunches (OPEFB) and polylactic acid (PLA). Cellulose fibers from oil palm OPEFB were isolated by chemical methods. Polymer composites made by mixing cellulose fiber of oil palm OPEFB and PLA based on differences in the composition of the cellulose fiber of OPEFB. The composition used is 0 PHR, 5 PHR, 10 PHR, 15 PHR, and 20 PHR. Results showed that polymer composite with higher composition of cellulose fiber of OPEFB more easily degraded in the environment. There are no significant differences in biodegradable between 15 PHR and 20 PHR, neither among 10 PHR, 5 PHR and control. At higher cellulose fiber of OPEFB content, 20 PHR, polymer composite was the most degraded in the environment.