Relationship between slope and position of the slopes with soil texture, organic matter, soil permeability anderodibility on dry land in the Gunungsari Village,Cikatomas Sub District, Tasikmalaya DistrictIndonesia has a lot of potential lands especially for agricultural uses. In the areas with steep slopingtopography and high human population, agricultural practices such as seasonal upland crops productionbecomes one of the issues in land damaging in Indonesia. This study aims were to determine the relationshipbetween the land slope and the texture, organic matter, permeability and erodibility of soils at differentslope positions in a land use so that can be used as a source of information and guidance to the communityor the population around the village as well as the institutions involved in land management. The study useda free survey method based on toposekuen. The study techniques used comparative and descriptive methodsto compare samples that collected in the conducted survey then performed explanation and description ofthe conditions in the field that qualitatively observed. The results showed that there was no significantrelationship between the slope and the texture, organic matter, permeability and erodibility of soils invarious slope positions. The 26-40% slopes in the middle and upper slope positions had the highesterodibility value compared to other slope and slope position.Keywords: Slope, slope position, land use, erodibility, organic matterABSTRAKIndonesia memiliki banyak lahan yang sangat potensial khususnya di bidang pertanian. Pada daerah-daerahyang memiliki topografi berlereng curam dan berpenduduk padat, usaha pertanian seperti tanaman semusimtegalan merupakan salah satu sumber kerusakan tanah di Indonesia. Penelitian ini bertujuan untukmengetahui hubungan antara kemiringan lereng dengan tekstur, bahan organik, permeabilitas danerodibilitas tanah pada berbagai posisi lereng di suatu penggunaan lahan sehingga dapat dijadikan sebagaisumber informasi dan arahan bagi masyarakat atau penduduk di sekitar desa serta instansi yang terkaitdalam pengolahan lahannya. Penelitian ini menggunakan metode survei bebas berdasarkan toposekuen.Teknik penelitian menggunakan metode komparatif dan deskriptif yaitu membandingkan sampel-sampelyang diambil berdasarkan metode survei yang dilakukan, kemudian menjelaskan dan menggambarkankondisi di lapangan yang diamati secara kualitatif. Hasil penelitian menunjukkan bahwa tidak terdapathubungan yang kuat antara kemiringan lereng terhadap tekstur tanah pada berbagai posisi lereng,kemiringan lereng terhadap bahan organik tanah pada berbagai posisi lereng, kemiringan lereng terhadappermeabilitas tanah pada berbagai posisi lereng serta antara kemiringan lereng terhadap erodibilitas tanahpada berbagai posisi lereng. Kemiringan lereng 26-40% pada posisi lereng tengah dan atas mempunyai nilaierodibilitas yang tertinggi dibandingkan dengan kemiringan dan posisi lereng lainnya.Kata Kunci: Kemiringan, posisi lereng, penggunaan lahan, erodibilitas, bahan organik

The efforts to utilize the agricultural land need a proper understanding of the soil characteristics. The soil characteristics themselves are influenced by the factors that regulate and control the soil forming and pedogenesis processes. The main soil forming factors in this study was the different ages and composition of parent materials from the eruption of Mt. Tangkuban Parahu in West Java. This research was done to comprehend the pedogenesis and to figure out the soil classifications that developed in two geological formations (Qyd and Qvu) and two ages of eruption (Holocene and Pleistocene) of Mt. Tangkuban Parahu. The study was conducted in Ciater, Subang Regency and Jatinangor, Sumedang Regency in West Java Province. The study consisted of four stages: preparation, field survey and soil sampling, laboratory analysis and presenting the report. The results showed that Pedon of Jatinangor consisted of three different stratifications of ages. The clay mineralogical composition was dominated by kaolinite, whereas mineralogical composition of the sandy fractions (heavy fractions) was augite-hypersthene. Pedon of Ciater also consists of three different stratifications of age. The clay mineralogical composition was dominated by allophane, while mineralogical compositions of the sandy fractions (heavy fractions) were green amphibole-hypersthene in the overlying horizons and amphibole-augite in the underlying horizons. The stage of soil formation on both pedon were cambic or viril. The soil classification according to Soil Taxonomy were Acrudoxic Durudands, medial over loamy-skeletal, isohyperthermic in Ciater Pedon and Fluventic Eutrudepts, fine, kaolinitic, isohyperthermic in Jatinangor Pedon.Key words: slow sand filter, activated carbon, silica sand, sand, gravel, zeolite

The Ciletuh Geopark area is an international geopark area recognized by UNESCO. As the area is undergoing development, it certainly raises some land and environmental problems, especially in agriculture. This study is intended to determine soil characteristics and collect field data and other supporting data from soil and social, physical factors, so that these data can be useful in the development of the Ciletuh Geopark Area, especially the development of agricultural areas. The purposes of this study were 1) To obtain comprehensive field data so that the soil characteristics of the Ciletuh Geopark area can be known, 2) How to spread the soil fertility status in Geopark Ciletuh Area, Ciemas District, Sukabumi Regency. This research was expected to provide an overview of soil fertility based on chemical and physical properties of the soil and can provide detailed soil resource information for the development of science to support research activities, and it was expected to provide preliminary information or primary data on soil fertility as part of the development of Ciletuh Geopark. The location of the study was conducted in the Ciletuh Geopark Area, Ciemas District, Sukabumi Regency, West Java Province. The study was conducted with qualitative, descriptive, and comparative methods and survey methods. The sampling of land was carried out in each unit of land, which is determined by transect based on the results of environmental observations so that it is sufficiently representative to represent the land in the area. Analysis of physics properties, soil chemistry, was carried out in the Laboratory of Plant Chemistry and Nutrition, Universitas Padjadjaran. Mapping analysis was carried out at the Land Evaluation Laboratory of the Department of Soil Science, Universitas Padjadjaran. The results showed that soil fertility status at the study site was moderate to low criteria with limiting factors P (phosphorus) and carbon organic soil. Land management that needs to be done was by adding organic materials and phosphorus fertilization regularly so that soil fertility can be good maintained and can be sustainable.

Sweetcorn has been treated by cow manure and inorganic fertilizer in Inceptisols. Inceptisols possesses low soil fertility and a relatively low to moderate level of organic matter content. This study has been conducted from June to December 2018 at the Field Experimental Station of Agriculture Faculty, Universitas Padjadjaran, Jatinangor, West Java. The treatments are as follow: A = Control, B = Standard NPK, C = 0 NPK + 1 cow manure, D = ¼ NPK + 1 cow manure, E = ½ NPK + 1 cow manure, F = ¾ NPK + 1 cow manure, G = 1 NPK + 1 cow manure, H = ¾ NPK + ¼ cow manure, I = ¾ NPK +½ cow manure and J = ¾ NPK + ¾ cow manure. The combination of cow manure and inorganic performed the best result.

The use of organic fertilizer in the form of manure at as dose of 5000-10000 kg.ha-1 has been practiced by corn farmers, while the Solid Organic Fertilizer (SOF) in a small dose isn’t quite is known among of corn farmer. This study aims to determine the effect of POPC combined with N P K to the results of corn (Zea mays L.). The research was carried out in Typic Eutrudepts land from in October 2013 to January 2014 use a RBD, consisting of SOF was combined nine treatment with N P K and one treatment as a control. The results of this research indicated that SOF with N P K doses improved the growth and yield of corn. Increasing the dose recommended dosage 1-2 POPC (500-1000 kg.ha-1) combined with one dose of a standard N P K can increase yields significantly, the highest result was achieved by treatment with 1 dose of 2 POPC standard N P K.Keywords: corn, solid organic fertilizer, Typic Eutropepts