Land Mapping Units Research Articles

Land suitability assessment of Arabica Coffee in Pahae Julu and Adian Koting Districts

The actual and potential land suitability of Arabica coffee aged 10 to 15 years is the goal of this study. The survey and purposive sampling from the Land Map Unit overlay (map of altitude, soil type, and slope) were used in the study. After that, it was matched with the land suitability table. The findings demonstrated that SPL I and II's actual land suitability was categorized as S3 (appropriate marginal), with wa, rc, nr, and eh dominating the limiting factors. The SPL remains marginally categorized as S3 after repairs, but the limiting factor changes to rc if repairs are made.

EVALUASI RETENSI HARA PADA LAHAN PADI DI KABUPATEN PAMEKASAN

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).

POTENSI PENGEMBANGAN TANAMAN KOPI ARABIKA BERDASARKAN TINGKAT KESESUAIAN LAHAN DI DESA BULUKERTO, KECAMATAN BUMIAJI, KOTA BATU

Bulukerto Village, Bumiaji District, Batu City is a village that is famous for its apple farming, but currently, the productivity of apples has decreased. The area of Arabica coffee plant development in Bulukerto Village is still not optimal. The purpose of this study was to evaluate the potential for developing arabica coffee plants based on the level of land suitability in Bulukerto Village, Bumiaji District, Batu City. The determination of sample points was based on the Land Map Unit and continued with soil sampling. The indicators observed in this study were water availability (wa) which consisted of annual rainfall and dry month length, altitude (h), slope (eh), root media (rc) which consisted of effective depth and soil texture, rocks in surface (s), drainage (oa), nutrient retention (nr) consisting of pH, organic C and cation exchange capacity, then available nutrients (n) consisting of total N, available P, and exchangeable K. Data analysis for actual land suitability used the method of comparing or matching data between actual land conditions and growing conditions for Arabica coffee plants. The results showed that the land condition in Bulukerto Village, Bumiaji District, Batu City, in general, has the potential for developing Arabica coffee, with potential land suitability indicating that an area of 438,77 ha of land has class S1 (suitable) and an area of 82,62 ha of land has class S2 (moderately suitable) with some limiting factors.

Analisis Evaluasi Kesesuaian Lahan Beberapa Komoditas Pertanian Tanaman Pangan di Pulau Nusalaut Kabupaten Maluku Tengah

This research was conducted on Nusalaut Island, Central Maluku Regency, aiming to determine the land suitability class of several food crop commodities. Data collection and analysis methods include: (1) analysis of thematic maps, (2) preparation of Land Unit Maps (PSL), (3) field checking using the field survey method, which uses independent survey techniques; (4) observation of land characteristics and quality in each land unit, and (5) analysis of land characteristics and quality in each land unit. The follow-up analysis is in the form of: (1) determining the level of land suitability and (2) producing a map of land suitability classes for food crop commodities on the island of Nusalaut. The results of the assessment of land suitability class on food crops cassava, sweet potato, and corn included in the category of marginally suitable class (S3) with limiting factors of water availability (wa), rooting media (rc), slope (eh) and unsuitable class (N). Cassava plantations had a marginally suitable class (S3) with a limiting factor (wa, rc) of 1452.4 ha or 66.51% and for an unsuitable class (N) of 731.52 ha or 33.50%. Sweet potato plants have a marginally suitable class (S3) with a limiting factor (wa, rc, eh) covering an area of ​​1452.38 ha or 66.5% and for an unsuitable class (N) an area of ​​731.52 ha or 33.50%. Corn plants have a marginal suitable class (S3) with a limiting factor (wa, rc) covering an area of ​​1452.38 ha or 66.5% and for an unsuitable class (N) an area of ​​731.52 ha or 33.50%.

Spatial Modeling of Land Suitability in Agroforestry Blocks of Gadjah Mada University’s Teaching Forest

The species' determination to rehabilitate and enhance the villagers' prosperity needs information on land characteristics, plants' growth requirements, and financial prospects. This study aimed to model the suitability of forest plants, fruit plants, and agriculture crops that are in-situ, desired by the community, and has prospecting financial return based on the biogeophysical characteristics of the Agroforestry Block of the Gadjah Mada University’s Teaching Forest (KHDTK UGM). The land suitability resulted from matching land mapping unit (LMU) characteristics and the plant's growth requirements. The overlay of slope and soil maps generated LMUs. Soil samples were taken and analyzed to identify the characteristics of each LMU. This research suggested that the highest suitability of planting patterns would result in higher land productivity and community prosperity. The Agroforestry Block with the S2 suitability class covered only 26.64% of the area. The land characteristics that inhibit the suitability were solum depth, slope, texture, pH, N, P2O5, and drainage. This research suggested that agroforestry planting patterns in the S2 suitability class should combine timber species (teak and mahogany), Leguminosae (lamtoro and gamal) to improve land quality and as the source of cattle fodder, fruits (jack fruit and mango), and farm crops such as pineapple,..

Determination of the Agricultural Land Potential Index Using a Geographic Information System: A Case Study of Aceh Tengah Regency, Indonesia

Agricultural problems that often arise are due to a lack of suitable and strategic agricultural land for its use, which results in poor agricultural production in the area. A land potential index that classifies existing land potentials from high to low class can be used to overcome this. This study aims to build an agricultural land potential index using a geographic information system in the Regency of Aceh Tengah, Indonesia, using a geographic information system. The method used in this research is a survey approach to collect information in the form of rainfall data, slope, lithology, soil type, land use and administrative maps of the Aceh Tengah Regency. The land potential index is obtained by overlaying the slope parameters, lithology, soil type, hydrology, and susceptibility to erosion into a land map unit that can classify it into five classes of a land potential index. The results of this study indicate that the Regency of Aceh Tengah is included in the very wet climate type. Maximum erosion was 1,213.6 tons per ha per year. The land potential index with very low criteria was 23.38% (102,002.42 ha) with a slope greater than 40%. The land potential index with very high criteria has an area of 3,807.80 ha (0.87%) with a maximum slope of 15%. A land potential index with very high criteria was found in the Linge, Atu Lintang, Lut Tawar, Pegasing, Bintang, Jagong Jeget, Kebayakan, Ketol, and Celala districts with an area of 2,014.26 ha, 1,266.33 ha, 174.81 ha, 148.07 ha, 77.86 ha, 73.63 ha, 46.77 ha, 4.14 ha and 1.94 ha, respectively. Meanwhile, the land potential index with very low criteria is found in all districts except Kute Panang and Atu Lintang.

Soil fertility index based on altitude: A comprehensive assessment for the cassava development area in Indonesia

The local variety of Jarak Towo cassava has a distinctive sweet taste and soft texture, suitable for use as raw materials for the creative food industry. The development of quality commodities requires suitable soil and land. This study aims to identify soil fertility index (SFI), determinants of SFI, and provide land management recommendations for developing the Jarak Towo in Jatiyoso Sub-Regency, Indonesia. The research phase consists of (1) determination of land map unit (LMU); (2) field survey; (3) soil sample analysis; (4) determination of the minimum soil fertility indicator (MSFI); (5) determination of soil fertility index (SFI) and (6) data analysis. Land Map Units are based on an altitude of 400, 600, 800, 1000, 1200, and 1400 m asl (meters above sea level), with 4 sampling points at each LMU. The results showed that soil fertility in Jatiyoso Sub-Regency was classified as moderate and high. Altitude greatly affects SFI. Area 1200–1400 m asl have moderate SFI while area 400–1000 m asl have high SFI. An altitude of 1000 m asl has the potential for the development area of Jarak Towo. Determinant factors of soil fertility are total nitrogen, ratio C/N, cation exchange capacity, exchangeable calcium and exchangeable magnesium. Land management recommendations to improve soil fertility and Jarak Towo varieties' development include adding organic matter and applying manure, lime and dolomite before planting.

PEMETAAN KELAS KAPABILITAS KESUBURAN TANAH SEBAGAI DASAR IDENTIFIKASI PERMASALAHAN DAN STRATEGI PENGELOLAAN LAHAN SAWAH

Farmers' lack of understanding of agricultural land characteristics leads to inaccuracy in farm management. As a result, this research aimed to classify soil fertility capability and design soil management strategies based on the limiting factor. This study took place in Malang Regency's Turen District. Soil samples were taken from 45 observation locations throughout 15 LMUs (Land Map Unit). The Fertility Capability Classification (FCC) technique was used to evaluate soil fertility classification utilizing soil texture, pH, organic C, CEC, cation base (K, Na, Ca, Mg), and base saturation. Turen District was found to have eight fertility capability classifications, including Chm (3-8 %), Chm (8-15 %), CLhm (0-3 %), CLhm (3-8 %), LChm (3-8 %), Lhm (0-3 %), Lhm (3-8 %), and Lhm (8-15 %). Single symbol C is interpreted as clay texture for both top and subsoil, as well as a single symbol for L as loamy texture. Symbol CL is interpreted as clay texture on topsoil and loamy texture on subsoil. Symbol LC is interpreted as loamy texture on topsoil and clay texture on subsoil. Symbol h in FCC class is interpreted as low pH (acid), and symbol m as low organic C. Soil pH and organic C content are the two most important limiting parameters for soil fertility.

Peatland Management Based on Hydrological Characteristics at Peatland Rangsang Island, Kepulauan Meranti Regency

Rangsang Island is one of the three main islands in the Kepulauan Meranti district which is dominated by peatlands. Rangsang Island, which faces the Straits of Malacca in the east, is under massive pressure in the utilization of its land. In the management of peatlands, the hydrological aspect plays an important role, in accordance with the characteristics of peatlands where the land is saturated with water, either periodically or permanently. This study aims to determine the hydrological characteristics of peatlands in an effort to sustainably manage peatlands in the Rangsang Island area. The method used is spatial analysis, hydrological analysis of peatlands. The data used consists of land unit maps, soil maps, rainfall for the period 1998-2019, ground water level (GWL) period August 2019-August 2021 population data. The results of this study indicate that fluctuations of GWL during dry season were 42 – 45 cm relatively safe; and GWL control in peatland management is very important in dealing sustainability of peat land especially during dry season. Cultivation of plants that are adaptive to the peat ecosystem such as liberica coffee supports an efforts to sustain the peatland area.

Prediction of Erosion and Sedimentation in Micro Catchment Area of Air Lanang Using Soil and Water Assessment Tool (SWAT) Model

This research aims to obtain erosion and sedimentation rate data in the micro catchment area of Air Lanang using soil and water assessment tool (SWAT) modelling within existing and scenario land uses. Geographically, the study area is located between latitude 3°26`23.48” - 3°31`46.09” S and longitude 102°24`11.74” - 102°28`26.35” E with a total area of 2987.06 ha. Soil analysis was conducted in the Soil Science Laboratory, Faculty of Agriculture, University of Bengkulu. The research data was analysed using SWAT model. Recorded data in this study were including soil analysis data, soil type map from land unit and soil map book Bengkulu sheet (0912) Sumatra, data of status area from KLHK, Digital Elevation Model National data from BIG, a set of climate data from BMKG, data of administrative border from RBI map Bengkulu Province and data of land use from the interpretation of satellite image and ground checking, as well as the scenario land use which was prepared following the community forest program from the government in the protected forest by converting the coffee plantation located within the protected forest area to woody plants with economic, social and conservative values. The results showed total erosion in the micro catchment area of Air Lanang with the existing land use in 2020 was 820731.87 ton year-1, while in the scenario land use was 288212.45 ton/year which were classified to very light, light, moderate, heavy and very heavy in class erosion. Based on the existing land use data, there was a decrease of erosion in the moderate to very heavy class of erosion for 7.27 % resulting in the very light and light class of erosion become 15.55 % after the simulation of the scenario land use model. The use of scenario land use model is effective to decrease erosion and sedimentation rate. The total sedimentation in the micro catchment area of Air Lanang in existing land use in 2020 was 354949.98 ton year-1 with the highest sedimentation in sub-basin 2 while the lowest sedimentation was found in sub-basin 12. On the other hand, the total sedimentation in the scenario land use model was 137365.04 ton year-1. The reduction of total sedimentation in existing land use in 2020 to the scenario land use model was 36.76 %.

EVALUASI KESESUAIAN LAHAN KERING UNTUK TANAMAN PANGAN DI KECAMATAN KUBUTAMBAHAN KABUPATEN BULELENG

Dry land is land whose use for the development of agricultural commodities is limited, due to constraints on the availability of nutrients and water. The research objectives are: to identify the suitability of dry land for upland rice, corn and peanuts; identify limiting factors and improvement efforts to increase land productivity. The method used is a survey to determine the characteristics of the land in the field and to take soil samples that are analyzed in the laboratory. Determination of sample points based on the results of overlapping maps of soil types, land use maps, slope maps using QGIS 3.4, so that a homogeneous land unit map (SLH) is obtained, and 6 SLH is obtained as observation points. The results of field and laboratory data analysis were matched with the growing requirements for upland rice, corn and peanuts. The actual land suitability for upland rice, corn, and peanuts is classified as S2 (fairly suitable) to N (not suitable). The limiting factors are slope, erosion hazard, temperature, texture, rainfall, pH, N-total, P2O5, Cation Exchange Capacity, Base Saturation, availability of oxygen, and C-organic. Improvement efforts that must be done are making terraces, fertilizing urea, fertilizers containing phosphate, mulching using plant residues, giving organic matter, and improving drainage. After improving the limiting factors that can be improved, the potential land suitability classes for upland rice, corn and peanuts are S1 (very suitable), S2 (fairly suitable) and S3 (marginally appropriate).

EVALUASI KESESUAIAN LAHAN TANAMAN SERBA GUNA ATAU MULTI PURPOUSE TREE SPECIES (MPTS) DI DESA MANDALAWANGI KECAMATAN NAGREG KABUPATEN BANDUNG

Nagreg District, Bandung Regency is part of the upstream Citarum Watershed (DAS) which is the main watershed in West Java. Mandalawangi Village is one of the upstream watershed areas is identical to the steep topography so that the risk of surface runoff is higher, so must planted with annual plants that can be used by the community on land like this, MPTS plants. The object of research is to analyze the land suitability of MPTS plant species in the research location. This study uses data on biophysical characteristics, namely land height, soil type and rainfall. Based on these parameters, the research location is divided into 4 land unit maps. Field observations found 6 types of multipurpose plants, namely Nangka (Artocarpus heterophyllus), Kopi Arabika (Coffea arabica), Mangga (Mangifera indica), Nangka (Artocarpus heterophylus), Jengkol (Archidendron pauciflorum) and Petai (Parkia speciosa). The results of the analysis of land suitability evaluation at LMU 1 plants that match the characteristics of the land include Nangka (Artocarpus heterophyllus), Mangga (Mangifera indica) and Kopi Arabika (Coffea arabica). In LMU 2 there are four suitable species, namely Nangka (Artocarpus heterophyllus), Mangga (Mangifera indica), Jengkol (Archidendron pauciflorum) and Petai (Parkia speciosa). Whereas at LMU 3 and 4 only one species is suitable respectively, Sukun (Artocarpus altilis) and Kopi Arabika (Coffea arabica).

Application of Ecology-Geomorphology Cognition Approach in Land Type Classification: A Case Study in the Altay Region

Land types play an important guiding role in human survival and production. Clarifying the division of land types is the basis for ensuring the sustainable and coordinated development of social-economic-natural complex ecosystems. To date, the land type classification system has not formed a unified standard, and the existing classification fails to highlight the natural background elements of land. Therefore, it is important to construct a classification system that can reflect natural background elements. Additionally, land type classification is often based on land resource surveys. Updating the land type is generally difficult and slow, mainly due to a lack of appropriate information. Hence, it is necessary to develop an automatic land type renewal method using multisource information. This study proposes the ecology-geomorphology cognition (Eco-geoC) approach for land type classification. The approach is realized by the segmentation of land units using remote sensing images, geographic information, vegetation, soil, DEM, and geoscience knowledge. This approach is an extension of the object-based image analysis method. The spatial objects segmented from different attribute data are integrated, and finally, a comprehensive land mapping unit representing a certain degree of geographical homogeneity and land use potential is generated. The results show that the Eco-geoC approach is an integrated approach with objectification cognition on remote sensing images and multisource information using geo-knowledge. The Eco-geoC approach is tested in the Altay region. From coarse to fine scales, the study area is divided into two kinds of natural belts, 27 land systems and 78 land units, and a 1:500,000 land-type map, which shows a good coupling relationship between the physiognomy, vegetation, and soil in the Altay region, is compiled. The results of this study show that the use of the Eco-geoC approach for land type classification is significant and has potential for land assessment and planning. This approach can provide a scientific basis for the restoration of the regional ecology and the comprehensive management and adjustment of land resources and the environment.

Land Capability and Suitability Assessment for Sweet Potato (ipomoea batatas l.) in Cimanggung Sub District, Citarik Sub watershed, West Java

Cimanggung Sub District, located in the area of Citarik Sub Watershed, West Java, Indonesia, is one of important watershed that support life and water need. However, the pollution in this sub watershed is high, degraded the environment. Therefore, the agricultural management must be suitable with land capabilty and land suitability. The objective of this resarch was to evaluate the land capability and suitability for sweet potato (Ipomoea batatas, L). The assessment used the limiting factor for land capability and matching table for land suitability. The results showed that the Cimanggung Sub District consisted of 13 land mapping unit (LMU) with land capability classes: II- L2,E1,R1, LMU 8; III-P4, LMU 10; IV- L3, KE6, LMU 1, 2, 4, 6, 9, 12 and 13; VI-L4, LMU 5 and 7; VII15, LMU 3 and11. Areas suitable for agriculture were classes II, III, and IV (LMU 8, 10, 1, 2, 4, 6, 9, 12 and 13) and the areas non suitable for agriculture were classes VI and VII (LMU 5, 7 and 3). The actual land suitability for Cilembu sweet potato was S3 at LMU 8 and 10 and N1 at LMU 1, 2, 4, 6, 9, 12, and 13 with the main limiting factors were nutrient retention and rooting zone. Liming is the management that can be used to improve potential land suitability to LMU 1, 2, 4, 6, 12 and 13, which improve Nnr to S3nr, and to LMU 8 and 10, improve S3nr to S2nr. Clay fraction limiting factor in LMU 9 was irreparable.

Assessment of soil degradation potency for biomass production and the strategy for its management in Giriwoyo-Indonesia

Biomass production supports humans need for food so needs to be supported by optimal soil conditions. The study related to the potential for soil degradation in land characteristics is the first step for sustainable agricultural control. Potential soil degradation is compiled from the number of scores for each land map unit (soil type, slope, rainfall, land use) using technical guidelines for the preparation of soil degradation, and the Pearson correlation test to examine the causal relationship of soil degradation from each land characteristic. The results show that the land with the highest potential is with moderate level potential of 4,671.83 hectares (46.44% area) and the other part of 3,953.13 hectares (39.30% area) has low potential level. The main factors for potential soil degradation are the slopes, rainfall, and land use. The steeper the slopes and the high rainfall carried out on intensive agricultural land, the greater the degradation to the soil. Suggested land management strategies include soil conservation with minimal tillage, mulch application, terrace construction, and planting parallel to the soil contour. In addition, erosion research needs to be carried out to determine in detail the magnitude of the erosion prediction in this area.

Analysis of Land Suitability Based on Area Functions in the Merawu Watershed, Banjarnegara Regency

The decline in the quality of land and the environment is closely related to the increase in changes in land use to settlements as well as to agricultural land that is not in accordance with the spatial layout and function of an area. The purpose of this study is to analyze the suitability of land spatial plans based on the function of the area and analyze the suitability of land use to the function of the area. The method used is the scoring method by assigning a value to the nature of the parameters used in the analysis. The analysis used is Overlay where, the three maps that have been obtained using predetermined criteria are overlapped (overlay), so that the score value of the land unit map is then classified into areas with certain functions. Based on the results of the analysis, the watershed has 3 directions for the function of the area, namely the direction of the protected area function having an area of 17,876.01 ha, the buffer area having an area of 4,599.92 ha and the area for cultivation of seasonal crops and settlements having an area of 839.70 ha.

Integrated Analytical Hierarchical Process and Geographical Information System for Allocation of Compatible Land Uses along Uluguru Mountain Slopes

The northern slope of the Uluguru mountain, that falls under the sovereignty of Morogoro’s urban area, has steadily become populated and connected with uncontrolled human activity, which has had a harmful effect on the ecosystem. The rapid conversion of natural forests to farms and settlements has a severe effect on biodiversity and the land’s productive capacity. In order to assist the identification of compatible land uses for managing degradation and restoration of degraded land, as well as ensuring the long-term use of natural resources, this study applied the integration of Geographical Information System and Analytical Hierarchical Process. The land resources of the research area were identified using a Geographical Information System to guide in the evaluation of various land uses’ suitability. Land resource values were generated from different sources of data whereby elevation, slope, temperature, rainfall, soil properties, soil moisture index, and land surface temperature classifications were obtained. The land resource classification values throughout the study area were used to create land mapping units. The results of the criteria classification were integrated into questionnaires together with proposed compatible land uses obtained from the literature review. These well-structured questionnaires were used to retrieve expert opinions on land use allocation from environmental beneficiary institutions in the area. The influence of criteria on each suggested land use was assessed accordingly based on the score provided by Saaty’s scale. The weight of each criterion at each land mapping unit toward proposed compatible land uses for mapping purposes was calculated using the Analytical Hierarchical Process (AHP) technique. The weighted criteria produced by the AHP technique were integrated into GIS using the weighted overlay method to produce a map that reflects expert judgments on mountain slope planning for long-term natural resource management. A literature review reveals that conservation agriculture, agroforestry, and forest land use types are compatible in the management of natural resources in the area, while settlements have to be integrated to accommodate the existing situation. The integration of GIS and AHP produced a plan that consists of conservation agriculture that covers the majority of the study area (50%) and is generally found in the foothills of the mountains up to land mapping unit 3. Agroforestry is the second-largest land use, accounting for 19% of the study area and being concentrated in the second and third land mapping units. Settlements, which occupy 17% of the study area and are mostly located at the foothills of the mountain, are the third most covered land use. Finally, forest land use is distributed at the top of the research area, inside land mapping units 4 and 5, and accounts for 13% of the total study area. According on the findings of this study, a sustainable land use plan is recommended. Economic activity that could assist in the management of natural resources would be advantageous to both parties. Planning of the mountainous slopes within urban areas that are not designated as conservation zones should be done with great care, and only economic activities that assist management of natural resources should be permitted.

Pengaruh Kemiringan Lereng terhadap Kerusakan Tanah di Giritontro, Wonogiri

The Effect of Slope Gradient of land on the Soil Damage in Giritontro, Wonogiri. Soil degradation is one of the problems in agriculture that affects the level of quality and carrying capacity of the soil for certain land uses. This study aims to analyse the status of soil degradation, the effect of slope, the determinant factor, and recommendation for land management.It was conducted in Giritontro District, Wonogiri Regencywith survey methods by field verification, taking soil samples and laboratoryanalysis based on Regulation of The Government of Indonesia Number 150 of 2000. Analysis unit is land map unit (LMU) which obtained from an overlay of mapssoil types, slope, rainfall, and land use. There were 12 LMU, and repeated 3 site samplings in each it. The result shows that the status of soil degradation was classified as slightly degraded (R.I) in all area research of 5.016.37 ha. The slope has a very significant effect on soil degradation. Slope 26-40% has significant highest score of soil degradration. Determinant factors were soil bulk density and porosity, therefore giving organic matter and optimizing tillage were recommended to improve land quality.

JENIS-JENIS ANGGREK (Orchidaceae) DI TAMAN WISATA ALAM GUNUNG TAMPOMAS

The existence of orchid species in Gunung Tampomas Natural Tourism Park is still not widely known. The existence of orchids many endangered by both natural decay and excessive exploitation of orchids. Communities in Gunung Tampomas Natural Tourism Park had very little information about the beauty and benefits in particular, because of the lack of information regarding the species of orchids in the Gunung Tampomas Natural Tourism Park. The object of research is inventaritation of orchid species to conservation of orchid species in Gunung Tampomas Natural Tourism Park. The method of the research used by Exploration with determination cruise lines based LMU (Land Mapping Units). The result of orchid species are 11 species of epiphytes which has been identified as many as 10 species; one species is identified only to genus and 2 species of terrestrial orchid.

Distribusi Unsur Hara Kalium Tanah dan Kadarnya pada Tanaman Padi Sawah di Wilayah Sub Das Serayu Hilir Kecamatan Sampang Kabupaten Cilacap

This study aims to determine: (1) distribution of soil potassium nutrients in paddy fields in Serayu Watershed Downstream, Sampang District, Cilacap Regency, (2) distribution of soil potassium nutrient availability, K-content in plant tissue with rice yields in Serayu Watershed Downstream, Sampang District, Cilacap Regency, and 3) fertilizer recommendations potassium in paddy soil in Serayu Watershed Downstream, Sampang District, Cilacap Regency. The study method was conducted by determining 9 sample points by the making of SLH (Homogeneous Land Unit) map with a scale of 1:50.000 by overlaying the Sampang Disctrict Administration Map, the Soil Type Map, the Slope Map, and the Land Use Map. The variables mesured were pH H2O, pH KCl, DHL (electrical conductivity), redox potential, K-available, K-content in plant tissue, climatic conditions, plant varieties, and wet grain rice yields. The results showed that the distribution of potassium nutrients in Sampang District had a low status. The paddy varieties cultivated during research in Sampang District consist of Ciherang, HT Logawa, Inpari 32, and IR64. The climatic condition of Sampang District is the optimal climates for paddy cultivation. The best correlation result with crop yield was between K-available and crop yield. The value of K-available has a determinant coefficient of 47.37% of the yield of rice, while the K content in plant tissue has 19.45% of the yield of rice. Fertilizing recommendations in the research area is 87.73 kg K2O/ha or equivalent to an average of 175.47 kg KCl/ha.