Penutupan permukaan tanah dengan tanaman penutup (cover crop) merupakan salah satu langkah penting dalam pemulihan kualitas tanah bekas tambang batubara. Desmodium ovalifolium merupakan salah satu jenis tanaman penutup tanah (land cover crop) dari famili Leguminosae yang tidak menjalar dan melilit. Hasil analisis tanah bekas tambang batubara pada penelitian sebelumnya menunjukkan bahwa tanah tersebut memiliki tingkat kemasaman tinggi (pH 3,6 -4,2) dan kandungan hara sangat rendah (P-total 3,63 mg/100g). Dalam mengoptimalkan pertumbuhan D. ovalifolium pada kondisi tanah seperti demikian perlu dilakukan perbaikan lingkungan tumbuh (pH, P-tersedia dan ketersediaan unsur hara tanaman). Salah satu upaya perbaikan tanah adalah melalui pemberian kapur dolomit dan pupuk fosfat. Penelitian ini bertujuan untuk mempelajari pengaruh dosis kapur dolomit dan pupuk fosfat terhadap kemampuan D. ovalifolium dalam menutupi permukaan tanah dan menyumbang unsur hara N, P, K dan bahan organik pada tanah bekas tambang batubara. Penelitian ini menggunakan Rancangan Acak Kelompok dengan 12 perlakuan. Hasil penelitian menunjukkan bahwa kualitas tanah terbaik didapat pada pemberian 95,15 g dolomit dan 5 g Trisodium Phosphate Powder (TSP) per lubang tanam. Perlakuan tersebut mampu meningkatkan pH tanah dari 4,57 menjadi 6,5, menghasilkan berat kering pangkasan D. ovalifolium umur 3,5 bulan sebanyak 2149,84 kg/ha (2,15 ton/ha),

The yield of irrigated paddy rice in Sri Agung Village has decreased. In the last four years, the increase in the addition of input units (fertilizers) has not been followed by an increase in economic yields. This study aims to analyze the effect of organic fertilizers on soil fertility, such as pH, total N, organic C, available P and available K. The research was conducted in the rice fields of Sri Agung Village. Batang Asam area, West Tanjung Jabung Regency - Jambi. The research was conducted from April to September 2020. The study used a randomized block design with six treatments and five replications. The treatments tried were: Recommended Fertilizer (R), five types of organic fertilizer with a dose of 10 t ha-1 each, namely, Petroganik+R ( P1), Compost Solid Decanter + R (P2), Chicken Manure + R (P3 ), Cow Manure +R (P4) and Industrial Waste Compost + R (P5). The results showed that organic fertilizers significantly increased available K content of paddy soil but they did not significantly increase soil pH, total N, organic C and available P. The highest yield of dry milled grain (7.52 t ha-1) was obtained at +R (P1) Petroganic treatment.

Coal is a non-renewable natural resource. Coal has an important role in domestic and foreign energy resources. Coal is generally used in steam power plants (PLTU). In supporting the sustainability of coal energy, further exploration in coal development is needed. The research uses the required structural contour method with the aim of determining the distribution limits and direction of the continuity of the coal seam and only refers to the position of the coal seam and is applied to topographic maps. The observation location (LP) found in the research area contained 7 coal seams. Based on the criteria of the Indonesian National Standard (SNI), the number of outcrops that have a coal seam thickness above 1 meter are 2 outcrops with a thickness of 2.15 meters and 1.24 meters, respectively. The results of drawing the distribution pattern using the structural contour method based on the bottom of the coal seam, it is found that the direction of the distribution pattern is northwest-southeast. The continuity follows the direction of the hills and valleys based on a distribution pattern that is trending northwest-southeast with a developed control structure in the form of a pure rising fault. This is in accordance with the regional geological map of the study area with the direction of the continuity of the coal seam trending northwest-southeast. From the results of the distribution pattern and continuity, there are 2 coal outcrops that can be exploited with economic value.

This research was carried out with the aim of examining the effect of providing palm oil mill effluent (LCPKS) on several soil chemical properties (pH, C-organic, and CEC) and the growth of oil palm seedlings in the main nursery. The research was conducted for 5 months, starting from March 6, 2020 to August 15, 2020 in the main nursery area for  oil palm plantation companies, Belanti Jaya Village, Mersam District, Batanghari Regency, Jambi Province. The research was conducted using a Complete Acaka Design (CRD) based on the age and height of the oil palm seedlings that were uniform. The treatments used were based on the POME dosage, namely 0 L, 4 L, 5 L, 6.6 L, 10 L, and 20 L POME given every week for 20 months. Each treatment was repeated 4 times so that 24 experimental units were obtained and each unit consisted of 4 oil palm seeds so that the total number of seeds used in the study was 96 oil palm seeds. In the maintenance of seedlings, inorganic fertilizers were also given using compound fertilizers, namely NPKMg 15: 15: 16: 4, NPKMg 12: 12: 17: 2, and kiserit. The results showed that POME could increase pH from acidic to slightly acidic to neutral, C-organic from very low to moderate to very high conditions, but it could not increase soil CEC. The highest increase in pH and C-organic occurred in the 20 liter POME treatment. The provision of POME was able to increase height increase, increase in stem diameter, increase in the number of leaves, shoot dry weight, dry weight of the roots of the roots, and be able to provide an index of seed strength so that the seeds were able to be transferred to the field with seedlings of 9 months. The highest increase in oil palm seedling growth occurred in the 4 liter POME treatment.