The research aimed at evaluating four biochar types which have the most adequate characteristics as inoculant carrier of indigenous Phosphate Solubilizing Microorganism (PSM) from acid sulphate soil. The observed biochar characteristics consist of the bulk density, total pore space, water holding capacity, C organic, N, pH, EC, charcoal percentage, and ash content. The pore diameters and photomicrograph of biochar were observed by using SEM. The viability test was conducted in order to determine the appropriateness of biochar as PSM inoculant through inoculation on four biochar types made of rice husk, coconut shell, corncob, and oil palm empty bunch, followed by six months storage period. Monthly observation was conducted related to the PSM population, pH, and moisture content. The results show that interaction of biochar types and storage periods has no significant effect on the PSM viability, pH, and moisture content. The PSM viability of four biochars after six months storage period is relatively stable in the range of log 7.07 cfu.g-1 to log 9.18 cfu.g-1. The highest PSM viability was found on coconut shell biochar with the magnitude of log 9.18 cfu.g-1 and pH of 7.01 as well as moisture content of 26.86% after six months storage period. This research offers the advantage of using agricultural waste substance as biochar that capable to maintain microbial viability with six months storage period.

Currently, the production of consumable- rise relies on rice fields especially technical irrigated rice fields. In increasing rice production, the use of insecticides become the main option to control the pest attacks.This condition generates the environmental pollution of insecticide residues on the field- soil. The most widely used- pesticides by the lowland rice farmers are insecticides or poisons to control plant pests.The active ingredients contained in insecticides are methomyl, fipronil, buprofezin, and chlorantanipol and others. Each active ingredients have the percentages of 19.20%, 16.87%, 13.56%, 13.32%, and <10%, respectively. This study aims to detect insecticide residues in the soil generated by the insecticides uses.This research was conducted at the Musi Rawas rice field center which uses insecticides as the pest control. This research was conducted in March 2018 using survey method by taking soil samples on rice fields. Residual analysis was analyzed using Gas Chromatography (GC) in the Environmental Laboratory of the Indonesian Center for Biodiversity and Biotechnology Bogor (ICBB). Laboratory test results detected 0.04 ppm of methomyl as the highest residual content in the sample.Therefore, the result has exceeded the quality standard which is 0.02 ppm. Moreover, the soil needs the further remediation to reduce contaminated- pesticides.

Penelitian ini bertujuan untuk menentukan dosis pupuk cair yang optimal terhadap produksi rumput gajah taiwan (Pennisetum purpureum Schumach). Penelitian ini dilaksanakan di Kebun Percobaan Program Studi Peternakan Fakultas Pertanian Universitas Sriwijaya Indralaya Ogan Ilir, Sumatera Selatan. Penelitian dilaksanakan selama 4 bulan, dimulai dari bulan Juli sampai dengan Oktober 2011. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan 4 perlakuan dan setiap perlakuan terdiri dari 3 kelompok sebagai ulangan. Perlakuan yang digunakan adalah pemberian pupuk cair, dengan dosis yaitu C0 (0 Liter pupuk cair ha-1), C1 (1 Liter pupuk cair ha-1), C2 (2 Liter pupuk cair ha-1), dan C3 (3 Liter pupuk cair ha-1). Parameter yang diamati adalah produksi segar dan produksi berat kering rumput gajah taiwan. Hasil penelitian menunjukkan bahwa pemberian pupuk cair berpengaruh sangat nyata (P<0,01) terhadap produksi segar dan produksi berat kering rumput gajah taiwan. Produksi berat segar rumput gajah taiwan tertinggi sebesar 648,93 gram dan produksi berat kering nya sebesar 208,8 gram. Kesimpulan dari penelitian ini adalah pemberian pupuk cair 2 Liter ha-1 dapat meningkatkan produksi segar dan produksi berat kering yang optimal pada rumput gajah taiwan. Kata kunci: Pemberian, pupuk cair, produksi, rumput gajah taiwan

Bumi Nabung district consists of 6 villages with a total area of 7,810 ha which are divided into 251 ha of rain fed rice lands, 4,908 ha of dry land, 1,317 ha of lowland, 1,158 ha of yards and 176 ha of others. Rumbia district consists of 14 villages which has a total area of 22,696 ha of land consisting of 2,728 ha of yards, 17,358 ha of dry land, 326 rainfed paddy field, 839 ha of swamp land, 1,470 ha of lowland and 4,232 ha of others. Bumi Nabung and Rumbia districts have a low soil fertility potential that is reflected by the lowof soil pH, CEC, total N, available P, and high level of exchangeable Al and Al saturation. The results assessment based on the physical and chemical characteristics showed that Bumi Nabung district have 5 villages on suitable class S-2 (North Bumi Nabung, East Bumi Nabung, Bumi Nabung Ilir, South Bumi Nabung, and Sri Kencono) and one village New Bumi Nabung has less suitable class S-3. In the Rumbia District, there were 14 villages belonged to suitable class (S-2), namely Reno Basuki,

The efforts to improve soybean growth and production in tidal lands include applying lime, supplying some nutrients, and using improved varieties. The objective of this study was to find the effect of lime and NK fertilizer application for soybean (<em>Glycine max </em>(L.) Merill)<em> </em>growth in tidal land. The research was conducted at the greenhouse of the Agriculture Faculty of Sriwijaya University. The pot experiments used a complete randomized design arranged factorially with two factors. The first factor was six levels of lime (i.e., 0 ton ha^-1, 0.81 tons ha^-1, 1.63 tons ha^-1, 2.45 tons ha^-1, 3.26 tons ha^-1, and 4.07 tons ha^-1),and the second factor was two levels of fertilizer (i.e., site-specific fertilizer and fertilizer calculated based on FAO criteria) and fertilizer recommended by South Sumatera Agricultural Research. Each treatment combination was made of three replications; the total number of treatment pots was 36. The measured variables were plant height, number of pods, number of nonempty pods, number of seeds, weight of 100 seeds, and production. The results showed that liming significantly increased plant height, total number of pods, number of nonempty pods, number of seeds, weight of 100 seeds, and soybean production, while fertilizer did not significantly affect all variables. The interaction between fertilizer and lime significantly affected plant height and the weight of 100 seeds. Lime application of 3.26 tons ha^-1 gave the highest yield on lime treatment only with production at 2.853 tons ha^-1 compared to other treatments.

<p class="teksabst"><strong>Abstrak.</strong><em> </em>Penelitian ini bertujuan untuk menganalisis stabilitas agregat tanah dengan perlakuan berbagai isolat bakteri pemantap agregat (BPA) dan bahan organik berupa kompos yang terbuat dari campuran 90% rumput <em>Cyperus pilosus</em> Vahl dan 10% kotoran sapi, dengan masa inkubasi yang berbeda. Taraf perlakuan terdiri dari kontrol, kombinasi isolat I, II, dan III masing – masing dikombinasikan dengan komposisi bahan organik 0%, 0.5%, dan 1%. Hasil penelitian ini menunjukkan aplikasi isolat BPA pada tanah pasir berlempung disertai pemberian bahan organik menyebabkan populasi yang lebih tinggi dibandingkan tanpa aplikasi keduanya. <em>Klebsiella </em>sp. LW-13 yang dikombinasi dengan 1% bahan organik dan <em>Bukholderia anthina </em>MYSP113 yang dikombinasi dengan berbagai taraf bahan organik (0 hingga 1%) menyebabkan agregat menjadi sangat mantap sekali pada pengamatan 60 hari setelah aplikasi. Eksopolisakarida yang dihasilkan bakteri akan mengikat partikel tanah dan membentuk agregasi. Penggunaan bakteri <em>Bukholderia anthina </em>MYSP113 dinilai lebih efisien dalam pemanfaatannya untuk memantapkan agregat tanah karena memiliki kemampuan terbaik untuk memantapkan agregat tanah hingga sangat mantap sekali dengan atau tanpa penambahan bahan organik pada periode 60 hari pengamatan.</p><p><em><strong>Abstract</strong></em>. This study aimed to analyze the aggregate stability of soil with sdifferent treatments of aggregate-stabilizing bacteria and organic matter (compost made of mixture of 90% Cyperus pilosus Vahl grass biomass and 10% cattle manure) at different incubation period. Treatments consisted of control, combination of three different isolate with three different composition of organic matter (0%, 0.5%, and 1%). The results showed that the application of aggregate-stabilyzing bacteria to loamy sand soil and organic matter causes a higher bacteria population than without both applications. Klebsiella sp. LW-13 combined with 1% organic matter and Bukholderia anthina MYSP113 which was combined with various levels of organic matter (0 to 1%) showed high aggregation at observation of 60 days after application. The exopolysaccharide produced by bacteria binds soil particles and forms soil aggregation. The use of Bukholderia anthina MYSP113 bacteria is considered to be efficient in its utilization to stabilize soil aggregates because it has the best ability to stabilize soil aggregates to be highly stable with or without the addition of organic matter in the 60-day observation period.</p><p> </p>

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