Jurnal Solum
Not a member yet
158 research outputs found
Sort by
Pendugaan Erosi di Wilayah Tengah DAS Welang Kabupaten Pasuruan
Get PDFDAS Welang dengan luasan 522.89 hektar melewati wilayah administrasi Kabupaten Malang, Kabupaten Pasuruan dan Kota Pasuruan. Sejak terjadinya banjir pada tahun 2013 akibat meluapnya sungai Welang bagian hulu, DAS Welang dimasukkan ke dalam DAS kritis dan prioritas . Faktor penyebab banjir ialah meningkatnya penduduk di area bantaran sungai Welang dan eksploitasi sumber daya alam seperti pembalakan hutan yang berakibat tanah rentan terhadap erosi dan longsor sehingga berdampak pada bagian hilir. Pendugaan besarnya nilai erosi dibutuhkan dalam upaya menekan luasan tanah ter erosi.. Beberapa langkah yang dapat dilakukan adalah pendugaan erosi dengan menggunakan model perhitungan Universal Soil Loss Equation (USLE). Penelitian ini dilakukan di 5 satuan penggunan lahan yaitu sawah irigasi, tegalan, hutan, sawah tadah hujan, dan kebun campuran. Tujuan dari penelitian ini untuk mengetahui pengaruh penggunaan lahan pada wilayah tengah DAS Welang. Hasil penelitian menunjukkan bahwa nilai pendugaan erosi di daerah wilayah tengah DAS Welang memiliki nilai terkecil sebesar 0.03 ton/ha/thn pada penggunaan lahan tegalan Purwodadi dan nilai terbesar sebesar 41.97 ton/ha/thn pada penggunaan lahan Kebun Campuran Purwosari. Nilai TBE dominan sangat ringan dan ringan dengan Indeks Erosi rendah.Key words : Erosi, USLE, DAS, DAS Welan
The Growth and Yield of Sweet Corn with Herbicide Application on Ultisol
No full textGlyphosate is a widely used herbicide in the world, including in Indonesia. Many studies have reported that the use of glyphosate is harmful to soil microorganisms and, few reports on the effect of glyphosate on the growth and yield of corn. This study investigated the growth and yield of sweet corn cultivated on Ultisols under the effect of Glyphosate application. This study used a completely randomized design with four treatments and three replications in the greenhouse from July to November 2022. The treatments were the volume of herbicide consisting of 0, 5, 6, and 7 L/ha (equivalent 0, 2.43, 2.91, 3.4 Kg glyphosate-isopropyl ammonium/ha). The height of corn with the treatment 5 L/ha before 50 DAS got the highest value among all treatments with statistical differences. The 5 L/ha treatment also gave the best weight on corncob and corn roots at harvest time. The yield in the treatment 5 L/ha was 8.72 tons/ha, which was higher than the other treatments with no herbicide application, 6 L/ha and 7 L/ha, that gave 7.82, 6.89, and 6.33 tons/ha, respectively. From the results of this study, we can conclude that glyphosate affects the yield of sweet corn, which tends to decrease when glyphosate is used more than 6 L/ha
Penentuan Kesehatan DAS Welang Sesuai Nilai Daya Dukung DAS Berdasarkan Kriteria Lahan
Get PDFThe availability of land is dwindling along with the high population growth rate in each part of the Welang watershed, which has resulted in the health of the Welang watershed declining. Assessment of the health of the Welang watershed based on land criteria is expected to be able to determine the ability of the Welang watershed to provide for the needs of the community around the watershed. This study aims to determine the management and the condition of the carrying capacity of the watershed in terms of land criteria. Determination of watershed health was done by assessing the value of watershed carrying capacity according to the Regulation of the Minister of Forestry of the Republic of Indonesia Number: P.61/Menhut-II/2014 concerning Monitoring and Evaluation of Watershed Management. The carrying capacity value is reviewed based on land criteria, including: a) the percentage of critical land (PCL) through the calculation of critical land area, b) the percentage of vegetation cover (PVV) through the calculation of permanent vegetation area and c) the erosion index (EI) using the USLE approach. The Welang watershed is divided into upstream, middle and downstream areas of Bromo and Arjuno,. The results show that the carrying capacity of each part of the watershed is poor to moderate. The Arjuno upstream with the highest value of 50 is classified as bad class according to the percentage of PCL of 38.44%, PVV 66.92% and IE 1.88 tons/ha/year. Upstream Bromo has a value of 47.5 which is classified as poor class according to the PCL value of 28.10%, PVV 38.44% and EI 0.15 tons/ha/year. The downstream watershed has a value of 40, which is classified as medium class according to the percentage of critical land value of 0%, PVV 2.07% and EI 0.74 tons/ha/year and middle class has the lowest value 37.5 which is classified as medium class according to the PCL value of 6.44%, PVV 15.87% and EI 0.74 tons/ha/year. Based on the high PCL values in the upstream and middle areas which are classified as high, it can be concluded that the carrying capacity value of Arjuno and Bromo watershed is classified into the poor class as a result of the PCL values in the upstream and middle areas which are classified as high.Keywords: Carrying capacity, Erosion Index, Watershe
Sifat Fisik Tanah Pada Lahan Bawang Merah Di Kecamatan Gondang Nganjuk dan Kecamatan Kedungadem Bojonegoro
Get PDFSoil physical properties are those soil properties that affect plant growth and production, determining root penetration into the soil, soil water-holding capacity, drainage, soil aeration, and soil nutrient availability. Shallots prefer fertile soil, loose, and rich in organic matter. Loose and fertile soil produces large tubers. This research was conducted to determine and study the physical properties of the soil on shallots in Kecamatan Gondang, Nganjuk and Kecamatan Kedungadem, Bojonegoro. Undisturbed and disturbed soil samples were taken at depths of 0-20 cm and 20-40 cm. Determination of the sampling point using the Purposive Random Sampling method based on the type of soil and land use as well as surveying the location of observations. The selected soil types are Vertisols and Inceptisols. Each soil type is represented by 3 sampling points. The results showed that the physical properties of the various shallot fields studied had a soil texture dominated by clay and silt with a silty clay texture class, moderate bulk density, good soil porosity, soil permeability has various classifications from slow to fast, very stable. aggregate stability, and has low C-Organic material. Several parameters of the physical properties of the soil are suitable for growing shallots. However, the C-Organic content is still in the low category and it cannot meet the need for organic matter for shallot cultivation.Key words : soil physical, shallot, Vertisols, Inceptisol
Status Kerusakan Tanah Pada Berbagai Penggunaan Lahan Di DAS Welang Wilayah Tengah Kabupaten Pasuruan
Get PDFWelang watershed is a watershed located in Pasuruan Regency. Welang watershed has 522.89 km2. Changes that occur in the soil due to uncontrolled use can reduce soil productivity and reduce the main function of the soil. The factor causing soil damage is the increase in population in an area that is not following its function. The measurement of the standard criteria for soil damage refers to the Regulation of the Minister of the Environment No. 07 of 2006. This study aims to assess the status of land use against soil damage. The results showed that the Welang watershed in the central region of Pasuruan Regency had a damaged status, namely lightly damaged (R.I). Redox as a limiting factor in each different land use, namely irrigated rice fields, rainfed rice fields, mixed gardens, dry fields, and forests) in Purwosari and Purwodadi sub-districts. Efforts were made to improve the damage status with redox limiting factors with the addition of organics. The addition of materials is carried out by periodic fertilization for physical, chemical, and biological improvement of the soil.Key words: Damage, Welang Watershed, Lan
PENGARUH PUPUK ORGANIK DAN DOLOMIT TERHADAP PERTUMBUHAN Mucuna bracteata DI TANAH MASAM
No full textPenelitian bertujuan untuk mengetahui pengaruh pupuk organik dan dolomit terhadap pertumbuhan Mucuna bracteata di tanah masam. Penelilitan ini dilakukan pada bulan Desember 2022 sampai dengan April 2023 dilaksanakan di kebun pendidikan dan penelitian (KP2), Institut Pertanian Stiper di Desa Maguwoharjo, Kecamatan Depok, Kabupaten Sleman, DIY. Pada ketinggian tempat 118 mdpl. Penelitian dengan metode percobaan yang menggunakan Rancangan Acak Lengkap (RAL) yang terdiri dari 2 faktor. Faktor I dosis pupuk organik yang terdiri dari 5 aras dosis (%volume) atau perbandingan volume pupuk organik : tanah yaitu : 0 % atau 0:1, 20 % atau 1:4, 25 % atau 1:3, 33 % atau 1:2, dan 50 % atau 1:1. Faktor II adalah dosis dolomit yang terdiri dari 4 aras dosis, yaitu : 0, 10, 20, dan 30 g/polybag. Data hasil pengamatan disnalisis dengan Sidik ragam (Anova) pada jenjang nyata 5%, Perlakuan yang berpengaruh nyata diuji lanjut dengan DMRT 5%. Hasil penelitian menunjukkan bahwa pemberian pupuk organik dosis 0%, 20% ,25%, 33% dan 50% volume berpengaruh sama terhadap pertumbuhan dan nodulasi tanaman Mb. Pemberian dolomit dosis 0 g, 10 g, 20 g dan 30 g berpengaruh sama terhadap pertumbuhan dan nodulasi tanaman Mb
Karakteristik Sifat Fisik Tanah Wilayah Hulu Daerah Aliran Sungai (DAS) Rejoso Kabupaten Pasuruan
Get PDFWatershed Characteristics (DAS) are a specific description of watersheds characterized by topography, soil type, geology, vegetation, and land use. Physical characteristics can be the primary reference in planning, implementing, and evaluating appropriate watershed management. The research was carried out from January to August 2022 in the upstream Rejoso watershed (DAS) area, consisting of Tosari and Puspo Subdistricts, Pasuruan Regency, East Java. This study aims to obtain information about physical characteristics in the upstream region of the Rejoso watershed. This study uses a survey method of five land uses in this region. Five land uses namely, potato horticultural gardens with an altitude of 1,850-2,500 masl, horticultural gardens (potato, leek, and cabbage) of 1,350-1,850 masl, and forest land use of 800-1,350 masl are found in this area. Three sampling points were determined for each land use. The results showed that the physical characteristics of the soil in the upstream Rejoso watershed varied greatly with the slope. At the study site was classified as very steep, with soil density from low to medium, soil texture dominated by sand and dust fractions with dusty clay texture class, and permeability classified as slow to medium, moderate, and low to high organic matter content.Keywords: Soil physics, upstream watershed Rejos
Penilaian Status Kesuburan Tanah Pada Kawasan Hutan di Kecamatan Wonosalam Kabupaten Jombang
Get PDFWonosalam is one of the sub-districts in Jombang Regency. Various forms of land use exist in Wonosalam Subdistrict, one of which is forest area, Forest is a valuable natural resource, because it provides great benefits for human welfare. The aim of the study was to assess the fertility status and management reference on several forest land uses in Wonosalam sub-district. The study used a land survey method, soil samples were taken purposively (purposive sampling) at depths of 0-20 and 20-40 obtained 4 composite sampling points. Soil chemistry table was used to determine the value and criteria of soil chemistry. Stages of research with soil analysis using five soil fertility parameters (CEC, base saturation, C-organic, P-available and K-available), which are used to assess the state of soil fertility. The results showed that fertility was low at all sampling points due to limiting factors of C-organic concentration and alkali saturation.Keywords: fertility, forest, soil, wonosala
CAPILLARY ACTION OF WATER ON PEAT SOIL APPLIED SWRT MEMBRANES IN DIFFERENT LAND USES
Get PDFPlants, water, and peat soil interact to form peatland ecosystems, which are composed of these three interrelated elements. The water balance of peatlands is significantly influenced by the capillarity of the peat soil. This study attempts to ascertain the impact of depth on applying subsurface water retention technology (SWRT) membrane on capillary action based on moisture of peat soil in different    land uses. A completely nested randomized design was utilized in this investigation to avoid bias of the different degree of decomposition between land uses. The type of land use—namely, shrubs (PL1) and agricultural land (PL2) was the first account. The position of the membrane (its depth), which was set at -20 cm (D1), -30 cm (D2), and -50 cm (D3) and in addition to a control treatment without membrane installation (D0), was the second account. Three times each experimental unit was repeated. The YL-100 soil moisture content sensor, which is powered by Arduino, presented the research results. Arduino can produce digital values with a range of 0 to 1023 by converting moisture values that were  output as analog signals into digital values using an analog to digital converter (ADC) with a resolution of 10 bits. The outcome revealed that soil moisture content increasing up to the peat soil layer of 5 to 10 cm until the fifth day of observation due to rainfall along our study that increased the flux of water flow into the peat soil.Â
Aktivitas β-Glukosidase pada Beberapa Kelas Penggunaan Lahan Gambut Tropis di Pesisir Selatan, Sumatera Barat
Get PDFMost of the peatlands in Pesisir Selatan, West Sumatra have been converted into agricultural activities. Due to drainage, the peat decomposition process becomes faster. The activity of β-glucosidase is one of the enzymes that can be used as an indicator of the decomposition of organic matter and produces greenhouse gas emissions, likes CO2. Therefore, this study was conducted to identify the activity of β-glucosidase in several land uses in Pesisir Selatan peatlands. Observations were performed in several land-use types consisting of agricultural land (LP), bare land (LT), shrubs (SB), smallholder oil palm plantations (PSr), private company oil palm plantations (PSs), and forests (H). The activity of β-glucosidase was analyzed by using salicin and Na-acetate methods. The results of this study showed that the highest β-glucosidase activity was found in agricultural land use (LP). Based on the land use types, the activity of β-glucosidase follows agricultural land (LP) 3.42 μg.g-1.jam-1 > bare land (LT) 2.26 μg.g-1.jam-1 > shrubs (SB) 1.63 μg.g-1.jam-1 > smallholder oil palm plantations (PSR) 1.31 μg.g-1.jam-1 > private company oil palm plantations (PSs) 1.28 μg.g-1.jam-1 > forest (H) 0.80 μg.g-1.jam-1. Soil characteristic that significantly affects enzyme activity is water content where the higher the water content, the lower the β-glucosidase activity, and vice versa. Based on this study can be concluded that the change in land use from natural land to agricultural land triggers an increase in the activity of enzymes in decomposed peat materials.Key words: β-glucosidase, enzyme, palm plantation, land-use, peatlan