The experiments were carried out to study the characteristics of biochar made from rice husk and its potential as a soil amendment in acid soils. Biochar was produced by pyrolysis; after which it was applied as a soil amendment. The soil was incubated for 30 days, and then it was planted with rice. For comparison, soil was applied with: rice straw, rice husk, rice husk ash, Chromolaena odorata biomass, and no soil amendment. The characteristics of biochar were: water content 4.96%, pH 8.70, C 18.72%, P 0.12%, CEC 17.57cmol kg -1 , K 0.20%, Ca 0.41%, Mg 0.62%, and Na 1.40%. Application of biochar decreased soil bulk density, soil strength, exchangeable Al, and soluble Fe and increased porosity, available soil water content, C-organic, soil pH, available P, CEC, exchangeable K, and Ca. Out of these improvements, only soil carbon, phosphorus, exchangeable Al, soluble Fe, and soil strength significantly influenced rice biomass.

Palm oil Plantation Company as a business entity that aims to gain profits, in addition to pay attention to the principles of accountability as the application of Good Corporate Governance (GCG), also has the responsibility to implementation CSR in its operations based on applicable regulations. So it is interesting to conduct a study of the impact between company compliance with the rules, the application of accountability principles and the implementation of CSR to the company’s profits. This research type is normative research, and the data used for this research are some legislations, documents and books related to this research. The result of this research revealed that The palm oil plantation company as a corporate entity has responsibility in implementation of CSR in the company management by applying the accountability principle as part of the Good Corporate Governance principle, which is the implementation of CSR is not only a responsibility that owned by the company, but also as a promotion media in gaining profits.

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The purpose of this research was to determine the effect of rice husk of biochar combined with inorganic and organic amendments on soil strength, growth and yield of rice plants on acid sulphate soils. The research phase was to identify the physical properties of soil in both regions and the measurement of field penetration resistance. Furthermore, conducting field research using a randomized block design (RBD), with the treatment consisting of; control soil (B0), rice husk biochar 6 t.ha-1 (B1), rice husk biochar 8 t.ha-1 (B2), rice husk biochar 10 t.ha-1 (B3), rice husk biochar 12 t .ha-1 (B4), recommended inorganic fertilizer package (B5), recommended inorganic fertilizer package and rice husk biochar 10 t.ha-1 (B6), 10 t.ha-1 (B7) manure fertilizer 10 t. ha-1 and rice husk biochar 10 t.ha-1 (B8). The research observations consisted of several physical properties of soil in BPTP land and farmer's land. Field penetration resistance is measured by determining the value of soil strength (DAIKI). Observation of growth variables in the maximum vegetative phase, consisting of; plant height and a number of tillers, while the yield variable is; a number of panicles per clump, and dry grain weight per clump. The results showed that the strength of the soil in the Experimental Field of BPTP West Kalimantan was 470 kPa and the farmer's land was 500 kPa. This condition indicated high soil compaction in paddy-based acid sulphate fields in the West Kalimantan Sungai Kakap.

Peningkatan produktivitas padi pada tanah sulfat masam di Kalimantan Barat dengan penambahan bahan pembenah tanah yaitu biochar dan trichokompos. Penelitian ini bertujuan untuk mengetahui pengaruh campuran biochar dan trichokompos terhadap pertumbuhan dan produksi tanaman padi di tanah sulfat masam Sungai Kakap, Kalimantan Barat. Penelitian dilaksanakan di Balai Pengkajian Teknologi Pertanian (BPTP), Desa Sungai Kakap Kecamatan Sungai Kakap Kabupaten Kubu Raya dimulai dari bulan April sampai bulan Agustus 2021. Penelitian ini menggunakan metode Rancangan Acak kelompok (RAK) dengan perlakuan pembenah tanah (kode b) yaitu campuran biochar batok kelapa dan trichokompos perbandingan 1:1. Perlakuan terdiri dari 5 taraf yang diulang sebanyak 5 kali, sehingga diperoleh 25 petak percobaan. Adapun taraf perlakuan dalam penelitian ini yaitu b0 sebagai kontrol (tanpa campuran biochar dan trichokompos), b1 berisi campuran biochar dan trichokompos sebanyak 1 kg/bedengan, b2 berisi campuran biochar dan trichokompos sebanyak 2 kg/bedengan, b3 berisi campuran biochar dan trichokompos sebanyak 3 kg/bedengan, b4 berisi campuran biochar dan trichokompos sebanyak 4 kg/bedengan. Hasil penelitian menunjukkan perlakuan campuran biochar dan trichokompos sebagai pembenah tanah terhadap pertumbuhan dan produksi tanaman padi (Oryza sativa L.) di tanah sulfat masam memberikan pengaruh yang tidak nyata pada semua variabel yang diamati yaitu tinggi tanaman, jumlah malai, berat gabah dan volume akar. Campuran biochar dan trichokompos sebanyak 1 kg/bedengan menghasilkan pertumbuhan dan hasil lebih tinggi dibandingkan perlakuan lain.