Jurnal Ilmu Tanah dan Lingkungan
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Impact of Anthropogenic Destruction Toward Sedimentation and Erosion at Protected Forest of Wosi Rendani in Manokwari Regency
Full text linkCommunities who live around the forest in supporting their daily lives cannot be separated from interactions with the forest, including protected forests impact that triggers erosion, sedimentation, flooding and landslides. This study aims to identify the anthropogenic destruction in Protected Forest of Wosi Rendani (PFWR) and its impact on sediment and erosion. The research was conducted through surveys and data analysis by scoring. The head of the KPHL, forest rangers and retired Forestry Service employees were selected in a purposive sampling. The results showed that anthropogenic activities in the PFWR area included forest encroachment, illegal logging, shifting cultivation by burning, soil extraction and C excavation, conversion to built-up areas. Anthropogenic activities have an impact on increasing sediment from high to very high and erosion in the very high category. The increase in sediment and erosion caused by shrinkage and destruction of PFWR is now remaining 26% which if not managed properly will trigger floods and flash floods.Masyarakat yang mendiami sekitar hutan dalam menunjang kehidupan tidak terlepas dari interaksi dengan hutan, tak terkecuali dengan hutan lindung yang memicu kejadian erosi, sedimentasi, banjir dan longsor. Penelitian bertujuan untuk mengidentifikasi perusakan antropogenik Hutan Lindung Wosi Rendani (HLWR) dan dampak yang ditimbulkan terhadap sedimen dan erosi. Penelitian dilakukan melalui survey dan analisis data dengan skoring. Kepala KPHL, polisi hutan dan pensiunan pegawai Dinas Kehutanan dipilih dalam pengambilan contoh dengan segaja. Hasil penelitian menunjukkan aktifitas antropogenik di area HLWR meliputi perambahan hutan, penebangan liar, perladangan berpindah dengan cara membakar, pengambilan tanah dan galian C, alih fungsi ke kawasan terbangun. Aktivitas antropogenik berdampak terhadap peningkatan sedimen dari tinggi menjadi sangat tinggi dan erosi berkategori sangat tinggi. Peningkatan sedimen dan erosi disebabkan oleh penyusutan dan perusakan HLWR sekarang tersisa 26% yang jika tidak segera dikelola dengan baik akan menjadi pemicu penyebab banjir maupun banjir bandang
Correlation Analysis of Soil Biological, Chemical, Physical Properties at Various Altitudes in Bandung, West Java
Full text linkKabupaten Bandung memiliki ketinggian tempat antara 675 mdpl – 2,100 mdpl dengan suhu udara berkisar 14oC sampai dengan 30oC. Perbedaan ketinggian tempat dapat menimbulkan perbedaan iklim dan cuaca sehingga dapat mempengaruhi transformasi hara dan populasi mikrob di dalam tanah. Penelitian ini bertujuan untuk mengetahui korelasi sifat biologi dan kimia tanah, serta kaitannya antara sifat kimia dan fisika tanah pada berbagai ketinggian tempat di Bandung, Jawa barat. Pengambilan sampel tanah menggunakan metode Purposive Random Sampling dengan 5 kali ulangan. Sampel tanah terganggu diambil pada kedalaman 0-20 cm sebanyak ±1 kg, sedangkan contoh tanah utuh diambil menggunakan ring sampler. Pengambilan sampel tanah meliputi empat ketinggian tempat yaitu ketinggian 600 mdpl penggunaan lahan tanaman kol, ketinggian 1000 dan 1200 mdpl penggunaan lahan tanaman selada, serta ketinggian 1400 mdpl penggunaan lahan perkebunan kopi. Hasil analisis menunjukkan bahwa pada ketinggian 1000 mdpl populasi bakteri pelarut fosfat (BPF) dapat tumbuh optimum sebesar 93.6 x 103 CFU g-1 dengan pH tanah agak masam, P-Total sangat tinggi, dan P-Tersedia sedang. Populasi fungi dapat tumbuh optimum sampai ketinggian 1200 mdpl. Total populasi fungi berkorelasi tinggi dengan unsur hara P-Total dan N-Total di dalam tanah. Respirasi tanah berkorelasi positif dengan semua parameter yang berhubungan dengan sifat kimia tanah. Nilai bobot isi terendah pada ketinggian 1200 mdpl bersesuaian dengan nilai C-organik dan porositas tertinggi pada ketinggian tersebut.Bandung district has an altitude between 675 masl – 2,100 masl with air temperatures ranging from 14oC to 30oC. Differences in altitude can cause differences in climate and weather, which can affect nutrient transformation and microbial populations in the soil. This study aims to determine the correlation of biological and chemical properties of soil at various altitudes in Bandung, West Java. Soil sampling using Purposive Random Sampling method with five replicats. Soil samples were taken at a depth of 0-20 cm as much as ±1 kg. Soil sampling includes four altitudes of the place, altitude of 600 meters above sea level (masl) with the land use of cabbage plants, altitude of 1000 masl and altitude of 1200 masl with the land use of lettuce plants, and altitude of 1400 masl with the use of coffee plantation land. The results of the analysis showed that the height of 1000 masl of the phosphate solubilizing bacteria (BPF) population can grow optimally by 93.6 x 103 CFU g-1 with a slightly acidic soil pH, very high P-Total, and medium P-Available. The fungi population can grow optimally to an altitude of 1200 masl. Total fungi populations are highly correlated with P-Total and N-Total nutrients in the soil. Soil respiration is positively correlated with all parameters related to the chemical properties of the soil
Erosion Hazard Vulnerability and Soil Fertility Status in Forest Plantation Concession in Central Kalimantan
Full text linkDinamika perubahan tutupan lahan dapat mempengaruhi aliran permukaan dan selanjutnya erosi permukaan. Tebang habis, sebagai bentuk penerapan sistem silvikultur tentunya akan menurunkan evapotranspirasi dan menyebabkan meningkatnya jumlah air permukaan. Pemodelan dengan USLE menujukkan bahwa penggunaan tutupan lahan mempengaruhi mempengaruhi peningkatan erosi permukaan. Erosi dapat mencuci unrsur hara dan tentunya berdampak terhadap penurunan kesuburan tanah. Penelitian ini memetakan tingkat bahaya erosi di area konsesi hutan tanaman industri di Kalimantan Tengah. Dalam penelitian ini tercatat laju erosi di area tegakan Akasia (Acacia mangium), Ekaliptus (Eucaliptus pellita), Daerah Pelestarian Satwa Liar (DPSL) sebagai kawasan tidak terganggu, Penebangan dan Jalan Sarad berturut-turut: 3.0, 3.2, 1.5, 4.8 dan 5.0 (ton ha-1 tahun-1). Meskipun tingkat erosi terbilang tinggi seperti di area Penebangan dan Jalan Sarad, Tingkat Bahaya Erosi (TBE) masih rendah. Berdasarkan hasil analisis contoh tanah, hampir seluruh area memiliki tingkat kemasaman yang tinggi dan bertaraf kesuburan rendah.Land cover changes alter surface run off rate and erosion rate as well. The land clearing, as a part of the implementation of silvicultural system of forest plantation (THPB) remove all of vegetative covers which temporarily reduce evapotranpiration and hence increase surface erosion. Surface erosion may erode soil particles, leach nutrients and decrease soil fertility. This research estimated and mapped the rate of erosion, erosion hazard vulnerability, and soil fertility status in forest plantation concession in Central Kalimantan. The results showed that soil rate under Acacia, Eucalyptus, DPSL (undisturbed area), Harvesting Area and Skidding Road are: 3.0, 3.2, 1.5, 4.8, dan 5.0 (ton ha-1 year-1), respectively. Although erosion rate was relatively high, such as in the Harvesting and Skidding Road, the erosion hazard vulnerability (TBE) was still low due to deep soil stratum. Based on the analysis of soil samples, almost all areas had low pH and fertility
Manufacture Potassium Silicate Fertilizer Based on Quartz Sand from Bangka
Full text linkSalah satu upaya pemanfaatan potensi pasir kuarsa yaitu melalui pembuatan pupuk Kalium Silikat (K2SiO3), melalui reaksi SiO2 dalam pasir kuarsa dengan kalium hidroksida (KOH). Penelitian ini bertujuan mendapatkan suhu optimal dalam pembuatan pupuk K2SiO3 melalui pencampuran pasir kuarsa dari Bangka dengan KOH. Lebih jauh penelitian ini bertujuan mengevaluasi kelarutan pupuk K2SiO3 pada tanah serta pengaruhnya terhadap pH tanah, alumunium dapat ditukar (Al-dd), kalium dapat ditukar (K-dd) dan silika (Si) tersedia melalui percobaan inkubasi pada Ultisol Dramaga. Hasil menunjukan bahwa kandungan kalium dalam bentuk kalium oksida (K2O) tertinggi pada perlakuan suhu 1000 oC sebesar 66.9%, sedangkan terendah pada suhu 700 oC sebesar 55.1%. Sebaliknya, kandungan Si dalam bentuk SiO2 pada suhu 1000 oC sangat rendah. Kandungan SiO2 pupuk Kalium Silikat tertinggi pada suhu 800oC sebesar 35.1%. Pupuk K2SiO3 yang paling optimal dari penelitian ini adalah pada suhu 800 oC dengan memiliki kandungan K2O 60.0% dan SiO2 35.1%. Percobaan inkubasi menunjukkan dosis pupuk Kalium Silikat 2.50% adalah dosis yang paling efektif karena selain meningkatkan hara K-dd dan Si tersedia, juga mampu menurunkan nilai Al-dd dan memperbaiki nilai pH tanah menjadi relatif netral.One of the efforts to utilize the potential for quartz sand (SiO2) is through the manufacture of potassium silicate (K2SiO3) fertilizer, by reacting SiO2 in quartz sand with potassium hydroxide (KOH). This study aimed to obtain the optimal temperature in the manufacture of K2SiO3 fertilizer by mixing quartz sand from Bangka with KOH. Furthermore, the study aimed to evaluate the solubility of fertilizer in the soil and its effect on soil pH, exchangeable aluminum (exchangeable Al), exchangeable potassium (exchangeable K), and available silica (Si) through incubation experiment on Ultisol Darmaga. The results showed that the highest K content in the form of potassium oxide (K2O) was at 1000 oCelcius (oC) with a content of 66.9%, while the lowest was at 700 oC with a content of 55.1%. In contrast, the Si content in the form of SiO2 at a temperature of 1000 oC was very low. The highest SiO2 content of K2SiO3 fertilizer at a temperature of 800oC was 35.1%. The most optimal K2SiO3 fertilizer from this study was at a temperature of 800 oC with a content of 60.0% K2O and 35.1% SiO2. The incubation experiment showed that the K2SiO3 with the rate of 2.50% was the most effective rate because it increased the exchangeable K, available Si, soil pH to relatively neutral and also reduced the exchangeable Al
Direction for the Development of Settlement Area in Tanjungpinang City, Riau Island Province
Full text linkTanjungpinang City is characterized as a coastal area with dense settlements around the port. Based on BPS data, the rate of population growth in the medium category each year causes the formation of new activity centers that are heading towards the mainland. This study aims to: 1) Analyze the pattern of land use change in Tanjungpinang City in 2010-2020; 2) Analyzing land suitability for settlements; 3) Analyzing the availability of land for settlement development; 4) Predict land use; 5) Prepare directions for settlement development in 2030. Land use change analysis is carried out by using the overlay method on land use maps in 2010, 2015 and 2020. The land suitability of residential land is analyzed using the evaluation method developed by FAO 2007. Land availability is carried out by applying some availability criteria. Land use projections for 2030 are made using the Land Change Modeler found in the Terrset application. Based on the results of the study, it was found that there were 6,300.73 ha of land with appropriate land suitability classes and were available based on several criteria. Based on the results of the study also shows that the 2010-2020 period shows that the largest land use change occurs in residential land, in line with this in the prediction of land use in 2030 the largest increase in area also occurs in residential land use. This causes settlements in 2030 to be the largest land use covering an area of 3,453.38 hectares or 23.97% of the total area of Tanjungpinang City. The direction of settlement development until 2030 can be focused on lands that are included in priority categories 1 and 2, to avoid disasters, damage to land and land dispute
Klasifikasi Fase Tumbuh Padi dengan Pendekatan Berbasis Objek Menggunakan Citra Sentinel-2
Full text linkPemantauan tanaman padi di Indonesia didukung oleh pemerintah daerah di tingkat kecamatan. Praktik tersebut membutuhkan dana yang besar dan dinilai kurang efisien. Opsi lain adalah pemanfaatan data Penginderaan Jauh menggunakan citra satelit gratis Sentinel-2 untuk memantau pertumbuhan padi secara spasio temporal dan pada wilayah yang lebih luas. Citra Sentinel-2 didesain untuk mendukung pemantauan pertanian. Untuk memantau fase tumbuh padi dapat dilakukan dengan klasifikasi berbasis piksel, tetapi pendekatan ini memiliki keterbatasan munculnya salt and pepper yang mengganggu hasil dan akurasi klasifikasi. Pendekatan klasifikasi Object-Based Image Analysis dapat mengatasi fenomena ini dan lebih baik dalam meniru persepsi manusia terhadap objek. Penelitian ini bertujuan untuk mengidentifikasi fase tumbuh padi pada citra Sentinel-2 dengan pendekatan klasifikasi berbasis objek, dan memantau sebaran spasio temporal fase tumbuh padi. Citra Sentinel-2 dengan 10 akuisisi bulan Mei – Agustus 2021 dianalisis dengan pendekatan berbasis objek dan fase tumbuh padi diklasifikasi dengan pendekatan SVM. Hasil analisis menunjukkan bahwa fase tumbuh padi dapat diidentfikasi dan diklasifikasi dengan baik tanpa fenomena salt and pepper dengan pendekatan berbasis objek dari citra multi-temporal Sentinel-2. Ketelitian model klasifikasi SVM cukup baik dengan rata-rata akurasi 81,60. Klasifikasi SVM berbasis objek dapat memetakan sebaran fase tumbuh padi konsisten dan berlanjut dari citra multi-temporal Sentinel-2.Monitoring of rice crops in Indonesia is supported by the local government at the sub-district level. This practice requires a lot of funds and is considered less efficient. Another option is to utilize remote sensing data using Sentinel-2 free satellite imagery to monitor rice growth spatio-temporally and over a wider area. Sentinel-2 is designed to support agricultural monitoring. To monitor the growth phase of rice can be done with a pixel-based classification, but this approach has limitations due to the appearance of salt and pepper that affect the classification results and accuracy. The object-based image analysis approach can overcome this phenomenon and better mimic human perception of objects. This study aims to identify the growth phases of rice in Sentinel-2 imagery using an object-based classification approach, and to monitor the spatio-temporal distribution of rice growth phases. Sentinel-2 imagery with 10 acquisitions in May – August 2021 was analyzed using an object-based approach and the growth phases of rice were classified using the SVM approach. The results show that the growth phase of rice can be identified and classified properly without the salt and pepper phenomenon with an object-based approach from Sentinel-2 multi-temporal imagery. The accuracy of the SVM classification model is good with an average accuracy of 81.60. The object-based SVM classification can map the distribution of rice growth phases consistently and continuously from Sentinel-2 multi-temporal images
Characteristic and viability of nitrogen fixation bacteria and phosphate solubilizing bacteria in carrier media
No full textA consortium of nitrogen-fixing bacteria and phosphate solubilizers serves as biological fertilizers to increase the availability of plant nutrients such as nitrogen (N) and phosphorus (P). The experiment aims to study the character of nitrogen-fixing bacteria and phosphate solubilizing bacteria and compare their viability on the biochar (made from husk charcoal and corn cobs) as the carrier media. The experiment involved several tests, such as pathogenicity, nitrogen-fixing ability, phosphate solubilization ability on solid Pikovskaya media, compatibility, and viability. The results showed that KPB4 isolates were pathogenic to animals or humans. Nitrogen-fixing bacteria isolates, namely KBP1, KBP2, and KBP5, had N solubility (ppm) of 54.86, 77.79, and 76.28, respectively, and had NH3 concentrations (mg/L) of 66.61, 94.46, and 92.63, respectively. BPF9 (phosphate solubilizing bacteria isolate) had a phosphate solubilization index of 1.14. Each isolate of nitrogen-fixing bacteria was compatible with BPF9. The results showed that KBP2 and KBP5 each consorted with BPF9 on corncob biochar carriers had higher bacteria populations (15.50 x 107 CFU/g) after four weeks of storage.
Keywords: nitrogen-fixing, phosphate solvent, consortium bacteria, biocharKonsorsium bakteri penambat nitrogen dan pelarut fosfat dapat dijadikan pupuk hayati untuk meningkatkan ketersediaan hara tanaman seperti nitrogen (N) dan fosfor (P). Penelitian ini bertujuan untuk mempelajari karakter dan kompatibilitas bakteri penambat nitrogen dan bakteri pelarut fosfat serta membandingkan viabilitasnya dalam media pembawa yang berbeda, yaitu pada biochar berbahan arang sekam dan tongkol jagung. Penelitian ini terdiri dari uji patogenitas (uji hipersensitivitas dan uji aktivitas hemolitik), uji kemampuan penambatan nitrogen (uji Nessler), uji kemampuan pelarut fosfat pada media Pikovskaya padat, uji kompatibilitas, dan uji viabilitas. Hasil penelitian menunjukkan isolat KPB4 merupakan patogen terhadap hewan atau manusia (uji aktivitas hemolitik). Isolat bakteri penambat nitrogen (KBP1, KBP2, dan KBP5) memiliki kelarutan N (ppm) masing-masing 54.86, 77.79, dan 76.28 serta memiliki konsentrasi NH3 (mg/L) masing-masing 66.61, 94.46, dan 92.63. Isolat bakteri pelarut fosfat (BPF9) memiliki indeks pelarutan fosfat sebesar 1.143. Masing-masing isolat bakteri penambat nitrogen kompatibel terhadap terhadap BPF9. Hasil menunjukkan populasi KBP2 dan KBP5 yang masing-masing dikonsorsiumkan dengan BPF 9 pada bahan pembawa biochar tongkol jagung memiliki populasi lebih tinggi (15.5 x 107 CFU/g) setelah 4 minggu penyimpanan.
Kata kunci: penambat nitrogen, pelarut fosfat, bakteri konsorsium, biocha
Suitability of Mangrove Tourism in the Kacepi Mangrove Ecotourism Park, Kacepi Village
Full text linkPemanfaatan ekosistem mangrove untuk ekowisata sejalan dengan pergesaran wisatawan old tourism yaitu wisatawan yang datang dengan tujuan hanya untuk berwisata, menjadi new tourism yaitu wisatawan yang datang selain tujuan berwisata juga untuk pendidikan dan konservasi didalamnya. Taman ekowisata mangrove kacepi bertujuan meningkatkan pendapatan ekonomi masyarakat sekitar sebagai pengelola obyek wisata, yang pertama kali dibuka pada tahun 2019. Tujuan dari penelitian ini adalah untuk mengetahui jumlah jenis mangrove, kerapatan jenis mangrove, persentase kerapatan mangrove dan indeks kesesuaian wisata mangrove di taman ekowisata mangrove kacepi, Desa Kacepi. Metode yang digunakan pada penelitian adalah metode line transect untuk mengukur kerapatan dan mengamati jenis-jenis mangrove, metode Hemispherical Photography untuk menghitung persentase tutupan kanopi mangrove serta metode pembobotan/skoring untuk menentukkan nilai indeks kesesuaian wisata. Hasil penelitian ini menujukkan persentase tutupan kanopi adalah 73%, Jumlah jenis mangrove yang teramati adalah 5, kerapatan mangrove di TEMK adalah 17 ind/100m2, pasang surut air laut adalah 1,9 m, dan ketebalan mangrove adalah 183,45m. Secara keseluruhan, kesesuaian wisata mangrove di TEMK adalah 3,22 yang menunjukkan kesesuaian wisata mangrove di TEMK adalah cukup sesuaiUtilization of mangrove ecosystems for ecotourism is in line with the shift from old tourism tourists, namely tourists who come with the sole purpose of traveling, to new tourism, namely tourists who come not only for tourism purposes but also for education and conservation. The Kacepi Mangrove Ecotourism Park aims to increase the economic income of the surrounding community as a tourist attraction manager, which opened for the first time in 2019. The purpose of this research was to determine the number of mangrove species, the density of mangrove species, the percentage of mangrove density and the tourism value index of mangroves in the Kacepi mangrove ecotourism park, Kacepi Village. The method used in this research is the line transect method to measure density and observe mangrove species, the Hemispherical Photography method to calculate the percentage of mangrove canopy cover and the weighting/scoring method to determine the tourist suitability index value. The results of this research show that the proportion of canopy cover is 73%, the number of observed mangrove species is 5, the density of mangroves in Kacepi Mangrove Ecotourism Park is 17 trees/100m2, the low tide is 1,9 m, and the thickness of the mangrove is 183,45 m. Overall, the suitability of mangrove tourism in TEMK is 3.22 which shows the suitability of mangrove tourism in TEMK is quite suitabl
Identification of Soil Arthropods on The Allium Fistulosum Fields
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Lahan pertanian menjadi salah satu faktor keanekaragaman hayati. Keanekaragaman hayati (biodiversiy) merupakan semua jenis tanaman, hewan, dan mikroorganisme yang ada dan berinteraksi dalam suatu ekosistem yang sangat menentukan tingkat produktivitas pertanian. Secara umum tanah berfungsi sebagai tempat hidup, tempat pertahanan, dan sumber makanan bagi organisme tanah. Makrofauna tanah dapat memperbaiki sifat fisik, kimia dan biologi tanah, keberadaannya dipengaruhi keanekaragaman vegetasi. Tujuan penelitian adalah untuk mengidentifikasi komunitas fauna tanah yang aktif di permukaan tanah dan hubungannya dengan faktor fisika-kimia tanah pada lahan daun bawang. Penelitian ini dilaksanakan di lahan daun bawang milik petani setempat yang terletak di Kecamatan Pinang, Kota Tangerang, Banten menggunakan metode pitfall trap. Perangkap sumuran (Pit Fall Trap) digunakan untuk mengumpulkan serangga tanah yang berada di atas permukaan tanah, dilakukan selama 24 jam pada lahan daun bawang. Hasil pengamatan dan identifikasi menunjukan ada 2 kelas yaitu Insecta dan Arachnida serta 4 ordo yaitu Orthoptera, Spodoptera, Arachnida, dan Hymmenoptera dari Filum Arthropoda. Keberadaan Arthropoda tanah yang didapat menunjukkan adanya keanekaragaman yang rendah berdasarkan Shannon’s Diversity Index. Populasi semut ditemukan dominan di lahan tanaman daun bawang yang merupakan kelas Insecta, ordo Hymmenoptera sebesar 112. Hal ini disebabkan karena semut berperan sebagai predator polifagus yaitu mempunyai banyak jenis makanan, sehingga keberadaannya tidak hanya tergantung dari satu sumber makananAgricultural land is one of the factors of biodiversity. Biodiversity (biodiversity) is all types of plants, animals, and microorganisms that exist and interact in an ecosystem that greatly determines the level of agricultural productivity. In general, the soil serves as a place of life, a place of defense, and a source of food for soil organisms. Soil macrofauna can improve the physical, chemical and biological properties of the soil, its presence is influenced by vegetation diversity. The purpose of the study was to identify soil fauna communities active at ground level and their relationship to soil physico-chemical factors on leek fields. This research was carried out on leek land owned by local farmers located in Pinang District, Tangerang City, Banten using the pitfall trap method. Pit fall traps are used to collect soil insects that are above ground level, carried out for 24 hours on leek fields. The results showed that there are 2 classes, namely Insecta and Arachnida and 4 orders, namely Orthoptera, Spodoptera, Arachnida, and Hymmenoptera from the Phylum Arthropoda. The presence of soil arthropods obtained indicates the presence of low diversity based on Shannon\u27s Diversity Index. Ant populations are found predominantly on leek cropland which are a class of Insecta class, order Hymmenoptera of 112. This is because ants act as polyphagous predators, namely having many types of food, so their existence does not only depend on one source of food
The Solubility of Nickel on Mixed Ultramafic Soil with Peat Soil at Saturated and Unsaturated Water Condition
Full text linkGambut tropik dengan bobot isi yang rendah berdampak pada berkurangnya kemampuan tanah gambut dalam menopang tanaman. Untuk meningkatkan bobot isi gambut maka dilakukan pencampuran tanah mineral dengan tanah gambut. Namun sumber tanah mineral yang dekat ke lahan gambut adalah tanah berbahan induk ultrabasa dengan kandungan logam Nikel (Ni) yang tinggi mencapai 5000 ppm. Karakter lahan gambut yang asam dan berada pada topografi yang rendah menjadi dugaan akan meningkatkan kelarutan Ni saat terjadi banjir. Oleh karena itu pencampuran bahan-bahan tanah dan perlakuan air bertujuan untuk mengukur kelarutan Ni pada kesetimbangan pH setelah pencampuran dan diekstrak menggunakan larutan NH4OAc 1.0 N pH 7.0; 4.8; 4.2, HCl 1.0 N; 0.1 N, dan H2SO4 1.0 N. Kesetimbangan pH setelah pencampuran bahan tanah berada pada pH 5.2 – 6.1 yang berarti kelarutan Ni ditunjukan oleh hasil ekstrak larutan NH4OAc 1.0 N pH 7.0 - 4.8. Pada rentang kesetimbangan pH tersebut nilai kelarutan Ni pada perlakuan penjenuhan (J) dan pengeringan (K) tidak berbeda nyata pada uji taraf 5%. Namun kelarutan Ni pada setiap penambahan bobot gambut berbeda nyata pada kondisi penjenuhan yang dikeringkan sampai kondisi lembab (JK).Tropical peat with low bulk density affects the ability of peat soil to support plant growth. To improve the bulk density of peat, mineral soil is mixed to peat soil. However, mineral soil sources near peatlands are typically ultrabasic parent material with high nickel (Ni) content up to 5000 ppm. The acidic peat condition and low topography of peatlands may increase the solubility of Ni if in flooding condition. Therefore, mixing soil materials and water treatments are aimed at measuring Ni solubility at pH equilibrium after mixing and extracting using NH4OAc 1.0 N pH 7.0; 4.8; 4.2, HCl 1.0 N; 0.1 N, and H2SO4 1.0 N. The pH equilibrium after mixing soil materials was at pH 5.2-6.1, indicating Ni solubility is shown by the results of NH4OAc 1.0 N pH 7.0 - 4.8 extraction. Within this pH range, the Ni solubility value in the saturation (J) and drying (K) treatments did not differ significantly at a 5% level of significance. However, the Ni solubility with each addition of peat weight differed significantly under the saturated and moist-dried conditions (JK)