Jurnal Tanah Dan Sumberdaya Lahan
Latest articles in this journal
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 143-148; https://doi.org/10.21776/ub.jtsl.2023.010.1.16
Tuban Regency feels the impact of climate change on various economic supporting sectors. This makes the adaptation efforts in these sectors important as well as climate change mitigation to support the reduction of greenhouse gas emissions, one of which is by maintaining the existence of production forests. This study aims to identify the amount of carbon uptake by the two main plants. The method used is tree diameter data collection without harvesting. The diameter data is used to calculate biomass and carbon sequestration with allometric equations. The results showed that teak had the lowest biomass value produced at the age of 5 years at 94.26 t ha-1, and the highest biomass was recorded at the age of 10 years at 200.33 t ha-1. Meanwhile, mahogany at the age of 5 years, 10 years and 15 years had a total biomass of 40.76 t ha-1, 53.55 t ha-1 and 146.37 t ha-1, respectively. From the biomass value, the total carbon stored in teak aged 5 years, 10 years and 15 years, respectively, was 43.36 t ha-1, 92.15 t ha-1 and 90.05 t ha-1. While the the total carbon stores in mahogany aged 5 years, 10 years and 15 years respectively was 18.75 t ha-1, 24.63 t ha-1 and 67.33 t ha-1. The teak and mahogany production forests in this age group have a total area of more than 280 ha, so that the total carbon sequestration at BKPH Sundulan is 78,471 tons C from teak production forests and 1,835.3 tons C absorbed from mahogany production forests.
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 119-123; https://doi.org/10.21776/ub.jtsl.2023.010.1.13
Land use in Bogor Regency has diverse vegetation and different soil characteristics. Soil characteristics have an influence on land management. Improper land management has led to a decrease in microbial populations, biodiversity and a decline in soil quality and fertility. Soil fertility is produced by the interaction of the physical, chemical, and biological properties of the soil. This study aims to determine the correlation of soil biological and chemical properties in several different types of land use in Bogor Regency. Soil sampling was carried out using the purposive random sampling method with five replicates. Soil samples were taken at a depth of 0-20 cm by ±1 kg. The research site includes eight land uses namely bamboo gardens, sengon gardens, lamtorogung gardens, and dragon fruit orchards. The results of the analysis showed that the dragon fruit field had an acid pH with very high organic C and total N levels with the highest fungal population of 2.27 x 105 CFU g-1. Meanwhile, bamboo fields with an acid pH also have a medium organic C content and low total N with the lowest total fungi population of 0.37 x 105 CFU g-1. Azotobacter populations and respiration values had the highest correlation with the total P content of the soil. The correlation value of the total population of fungi was the highest, with a total N levels of 0.427.
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 25-35; https://doi.org/10.21776/ub.jtsl.2023.010.1.3
Various crop commodities are grown in Ngawonggo Village with various land uses, including rice fields, dry fields and agroforestry which are dominated by intensive agriculture. As a result, this agricultural pattern can potentially cause land degradation. One of the technological inputs in improving sustainable crop production systems is the application of mycorrhizal biofertilizers. This study aims to determine the level of population, mycorrhizal colonies and types of spores and the factors that influence them in rice fields with rice (Oryza sativa), dry fields with sengon (Paraserianthes falcataria), and agroforestry with coffee (Coffea sp.) and Durian ( Durio zibethinus). The study used a randomized block design with sampling on three land uses, with 5. The results obtained only one type of mycorrhizal spore of Glomus sp. on all land uses. The highest number of spores was in agroforestry land use, as much as 102 g-1 soil, and the lowest was in rice fields, as much as 10 g-1 soil. Mycorrhizal colonies on plant roots were the highest in agroforestry land use, it was found that 42.77% of coffee roots were colonized by mycorrhizae, followed by durian with a colonization proportion of 42.29%, rice fields with commodities had the lowest colonization proportion of 16.21%.
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 135-142; https://doi.org/10.21776/ub.jtsl.2023.010.1.15
The tea plantation industry in West Java is experiencing problems with the degradation of organic matter, which can be seen from the decrease in organic C in the Bandung area and the large amount of factory solid waste produced every day. The provision of solid tea fluff as organic matter by composting can be a solution to improve the physical properties of the soil in tea plantations, and it is necessary to provide indigenous microbes to maximize plant growth in the form of Azotobacter sp. This study used a factorial randomized block design with two factors, namely soil media 100% topsoil + 0% tea fluff (F0), 70% topsoil + 30% tea fluff (F1), 60% topsoil + 40% tea fluff (F2). ), 50% topsoil + 50% tea fluff (F3), 40% topsoil + 60% tea fluff (F4), 30% topsoil + 70% tea fluff (F5) with an additional dose of Azotobacter sp. 0 mL (A0) and 3 mL (A1). The results for the soil unit weight parameter were significantly different (p<0.05), and there was an interaction between the soil media treatments and Azotobacter sp. all treatments experienced a decrease in bulk density, while the porosity parameter was not significantly different. However, for plant parameters, the F0A0 treatment showed better results than other treatments on the initial growth of tea seedlings.
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 157-163; https://doi.org/10.21776/ub.jtsl.2023.010.1.18
The main commodity of food crops cultivated in Indonesia is rice, but rice productivity in Indonesia has decreased. Factors that cause a decrease in rice productivity are land conversion that continues to increase and unbalanced fertilization. Efforts to increase rice yields are by applying a combination of inorganic fertilizers and biological fertilizers. Otherwise, this study focused on studying the effect of the application of a combination of inorganic fertilizers and biological fertilizers on several soil chemical characteristics and rice production in the experimental field of the Faculty of Agriculture, Jatimulyo District, Malang City. Application of biological and inorganic fertilizers with analysys of variance (ANOVA) showed a significant effect on chemical characteristics parameters such as pH and available P. Otherwise, this research showed a significant effect on production, such as the weight of biomass and milled dry grain harvested. Based on this research, the best combination fertilizer is T3 (75% basal inorganic fertilizer + 100% biological fertilizer).
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 149-155; https://doi.org/10.21776/ub.jtsl.2023.010.1.17
The development of developed land over the last 15 years in Ambon City has affected land cover changes in the Wae Batutangan watershed. This is a result of higher population growth and the need for residential land, which is increasing every year. This study aimed to analyze land cover changes in the Wae Batu Hang watershed in 2012, 2017, and 2022. The method used in this study was a spatial comparison of land cover changes in 2012 and 2017, as well as in 2017 and 2022. Land cover data is obtained from the results of this study. Visual interpretation and digitization where land cover in 2012 was obtained from IKONOS images, and land cover in 2017 and 2022 were obtained from SPOT 6 images. Results of this study showed that the cover of built-up land and open land continues to increase in the area, along with population growth and the high demand for land in watersheds.
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 165-173; https://doi.org/10.21776/ub.jtsl.2023.010.1.19
Volcanic activity provides fertility for the land on the slopes of Merapi. The material from the eruption of Merapi contains many nutrients. The fertility of the Merapi area is used by the people on the slopes of Merapi to grow vegetable and fruit crops. This study aimed to determine the influence of organic and semi-organic farming practices on several soil properties on the southern slopes of Mount Merapi. This research used a survey method. Research locations on organic farming practices in Tani Organik Merapi (TOM), semi-organic farming practices 1 in Indmira and semi-organic farming practices 2 at UPTD BP3MBTP Ngipiksari. Determination of sample points was carried out purposively based on their agricultural practices. Sample points in organic farming practices, semi-organic 1 and 2 as many as 9 sampling points. After that, the physical, chemical, and biological properties of the soils were analyzed ina laboratory. The results of this study showed that organic farming practices could increase soil pH, caciton exchange capacity (CEC) and the number of bacteria.
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 175-184; https://doi.org/10.21776/ub.jtsl.2023.010.1.20
Rice production in Pamekasan Regency from 2011 to 2019 decreased by 38.71% due to farmers applying fertilizers that did not match plant needs, such as insufficient application of manure, organic fertilizers and other inorganic fertilizers. In addition, the basic fertilization obtained by farmers comes from informal information, so the application of fertilizers on the land is not efficient. Efforts have been made to overcome these problems by evaluating soil fertility from the aspect of nutrient retention as a basis for determining fertilizer requirements. The purpose of this study was to evaluate soil fertility, especially from the aspect of nutrient retention in paddy fields in Pamekasan Regency. This research used a purposive random sampling method based on SPL (Land Map Unit). Parameters observed were cation exchange capacity, organic C, base saturation, pH, electrical conductivity, texture, porosity, bulk density and saturated hydraulic conductivity. The results showed that the high level of soil fertility in Pamekasan Regency was found in cation exchange capacity in Tlanakan District (43.92 cmol kg-1), base saturation in Galis District (99.38%), pH in Tlanakan District (7.00), electrical conductivity in Pakong and Pasean districts (0.39 mS) and the dominant texture is the clay fraction. Low fertility levels are found in soil organic C in Waru and Kadur Districts (0.08%), bulk density in Pasean District (1.59 g cm-3), porosity in Proppo District (34.89%), and saturated hydraulic conductivity in Pasean District (46.34 cm hour-1).
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 1-13; https://doi.org/10.21776/ub.jtsl.2023.010.1.1
Soil degradation to support the growth and development of plants and produce goods and services has become a global concern. To support government programs and efforts to improve land, the role and cooperation of researchers with local governments should be increased to multiply, and information related to the potential of soil degradation can be used as supporting data for development planning in an area. The potential and status of soil degradation in the region of East Kutai Regency, are still relatively low. But it has a high potential for damage because land use more increasing for various purposes. Soils in East Kalimantan is dominated by old soil, such as Podsolic or Ultisols, easily damaged if utilized without regard to principles of conservation. Especially for soil in Rantau Pulung there is a parameter with exceeded status of standard quality, i.e. permeability; then in Batu Ampar found four parameters, namely permeability, the composition of soil fraction, bulk density and soil pH, next to Long Masangat founded two parameters, namely bulk density and permeability. The more of limiting factors, then in the land use should also apply and demand high conservation treatment to maintain the land or soil quality.
Jurnal Tanah Dan Sumberdaya Lahan, Volume 10, pp 75-82; https://doi.org/10.21776/ub.jtsl.2023.010.1.8
The intensity of the high rainfall resulted in the overflow of the Wae Heru watershed, which resulted in a catastrophic flood that hit residential areas around the watershed. This study aimed to analyze spatially the level of flood hazard and its exposure to settlements in the Wae Heru watershed, Ambon City. This research used overlay technique, scoring method and weighting using ArcMap 10.8 software as a Geographic Information System (GIS) based approach. The variables used included rainfall, elevation, slope, soil type, land cover and distance from the river. The results showed that the flood hazard level was dominated by a low hazard level of 361.28 ha and the flood exposure level in settlements was dominated by a high hazard area of 54.68 ha. The results of the study are expected to be useful in flood mitigation efforts to minimize losses, both fatalities and physical damage.