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.
Compost application can contribute to agricultural sustaniability that it has proven to improve soil quality and crops yield. One of the ingredients can be made of china violet that mostly found as weeds in oil palm and rubber plantation. The aims of this study were to evaluate the effect of compost application on soil properties of Ultisol and peanut yield. The experiment was carried out at the Experimental Field of Agriculture Faculty, University of Jambi, Mendalo Darat, Jambi. The treatments were arranged in a rondomly blocked design consisting of (i) control (without compost), (ii) 5 Mg ha-1 compost, (iii) 10 Mg ha-1 compost, (iv) 15 Mg ha-1 compost, and (v) 20 Mg ha-1 compost. The results of study showed that the application of compost improve the soil chemical properties by increasing soil pH, CEC, N, P, and K. In addition peanut yield was increased by compost application. The highest increase in peanut yield was achieved by application of 20 Mg ha-1 compost.
The construction of drainage channels following the opening of peat ecosystems without proper water management results in rapid decline of water level in peat swamp ecosystems, which potentially causes fires. Peat land fires triggered by intentional or unintentional human negligence and are supported by long dry season. This research aims to examine the potential of peat land fires based on the physical characteristics of peat on the type of use of secondary forest land, shrub land, and oil palm land. The study was conducted on peat ecosystems for one year using survey methods and field observations. The results of study indicate that changes in peat land use from secondary forests to shrubs and oil palm plantations result in changes in some physical characteristics of peat, namely humification level, bulk density, peat thickness, organic matter content, hydraulic conductivity, and soil water content. The depth of the ground water table affects the ground water content. Potential fires occur on oil palm land and on shrub land from July to September, whereas secondary forest land does not have the potential to cause fire. In order to avoid fires in oil palm and shrub land areas, it is necessary to manage water by maintaining the groundwater level above 50 cm.
Penelitian ini bertujuan untuk mempelajari serapan hara N, P dan K pada areal aplikasi dan tanpa aplikasi Limbah Cair Pabrik Kelapa Sawit (LCPKS) pada tanaman kelapa sawit menghasilkan. Penelitian dilaksanakan di kebun kelapa sawit masyarakat milik bapak Victor Sitorus Desa Suban Kecamatan Batang Asam Kabupaten Tanjung Jabung Barat. Penelitian dilakukan dengan metode survei exploratif deskriptif dengan metoda purposive sampling yang dilakukan melalui pendekatan tanaman sampel yang telah ada/ditentukan pada lokasi penelitian yang mendapatkan aplikasi air limbah PKS dan areal tanpa aplikasi air limbah PKS dengan umur tanaman kelapa sawit dan jenis (ordo) tanah yang sama. Pengambilan sampel daun dilakukan pada areal aplikasi yang berjumlah 40 tanaman sampel, demikian juga di areal tanpa aplikasi. Selanjutnya sampel tanaman dikompositkan menjadi 8 sampel dimana 1 sampel komposit mewakili 5 tanaman sampel. Dalam analisis serapan hara digunakan daun dari pelepah ke- 17. sedangkan data produksi diamati disetiap panen meliputi jumlah TBS, berat TBS dan BJR. Hasil penelitian menunjukkan unsur hara N, P dan K pada daun tanaman kelapa sawit di areal aplikasi dan tanpa aplikasi dalam kondisi optimum. Kadar air di areal aplikasi lebih tinggi dari kadar air pada areal non aplikasi limbah cair. Produksi kelapa sawit pada areal aplikasi lebih tinggi dibandingkan areal tanpa apikasi LCPKS terutama pada BJR tanaman kelapa sawit.
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