Jurnal Agrista
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Susunan Horison Tanah Sawah pada Toposekuen Latosol Berbahan Induk Volkanik di Daerah Bogor Jakarta
No full textThe Sequence of Horizons of Paddy Soils in a Toposequence of Latosol on Volcanic Parent Materials in the Bogor Jakarta AreaABSTRACT. The sequence of horizons of paddy soils is different from non paddy cultivated. The aim of the research were: (1) to study the sequence of horizons of paddy soils in a toposequence of Latosol on Volcanic materials in the Bogor Jakarta Area; (2) to study the sequence of paddy cultivated intensity to sequence of horizons. Twelve pedons of different altitude (90 650 m above sea level) and different paddy cultivated intensity (0/year, 1/year, 2/year) were investigated sequence of horizons in the field. The result of the research showed that the horizons sequence, on non paddy cultivated soils consist of: tillage layers and the original soil layers. On 1x paddy/year consist of: plow pan layer, and iron/manganese/nodule Mn illuviation layer. On 2x paddy /year consist of: tillage layer of surface reduction, plow pan layer, Fe/Mn illuviation layer, and reduce subsurface layer
Efek Inokulasi Cendawan Mikoriza Arbuskular Indigen dan Dosis Mulsa Terhadap Keefektifan Mikoriza dan Karakteristik Agronomi Padi Gogo (Oryza sativa L.) di Rumah Kaca
No full textEffect Inoculation of Indigenous Population of Arbuscular Mycorrhiza Fungi and Dosage of Mulch on Mycorrhiza Effectiveness and Agronomy Characteristics of Upland Rice (Oryza sativa L.) in Green HouseABSTRACT. The experiment was conducted to study agronomy characteristics and mycorrhiza effectiveness of upland rice in green house with various levels of AMF inoculants and mulch dosage application. The pot of experiment was carried out in the green house of Agricultural Faculty, The University of Lampung from October 2004 untill February 2005. The experiment used randomized complit block design arranged in factorial pattern with two factors. The first factor was dosages of mulch (0, 5, 10, and 15 ton ha-1) and the second factor was AMF inoculants dosages which consist of four levels, those were 0, 25, 50, and 75 g pot-1. The result of this experiment showed that dosages of mulch and AMF inoculants affect to agronomy characteristics and mycorrhiza effectiveness of upland rice in the green house. Up to the certain dosages, inoculants of AMF and mulch raised P content in plant, shoot dry weight, root dry weight, harvest index, and mycorrhiza effectiveness
Agronomic Performance of Green Beans (Vigna radiata L.) Grown under Different Shade Levels
No full textPenampilan Agronomi Tanaman Kacang Hijau yang Ditanam Pada Tingkat Naungan BerbedaABSTRAK. Intensitas cahaya rendah akibat adanya naungan merupakan salah satu kendala utama dalam pengembangan tanaman pangan sebagai tanaman sela pada areal perkebunan. Pemahaman yang lebih baik terhadap karakter agronomi tanaman pangan pada kondisi naungan sangat membantu dalam pengelolaan tanaman pangan sebagai tanaman sela secara produktif. Penelitian ini bertujuan untuk mengevaluasi penampilan agronomi beberapa varietas kacang hijau pada tingkat naungan berbeda. Perlakuan disusun secara faktorial dalam rancangan acak kelompok dengan tiga ulangan. Faktor pertama berupa naungan dengan dua taraf, yaitu 0% dan 50%. Faktor kedua berupa varietas kacang hijau yang meliputi Merpati, Parkit, Walet, Jelatik, Betet, Kenari, dan Perkutut. Hasil penelitian menunjukkan bahwa naungan 50% secara nyata menurunkan jumlah daun, akumulasi bahan kering, hasil biji dan indeks panen. Pada kondisi naungan 0% dan 50%, jumlah polong, jumlah biji dan indeks panen secara nyata tetap berkolerasi positif dengan hasil biji tanaman kacang hijau. Tampaknya, jumlah polong, jumlah biji, dan indeks panen juga menjadi karakter agronomi penentu hasil kacang hijau pada kondisi naungan
Evaluasi Kriteria Kesesuaian Lahan Kelapa Sawit di Kebun Baru PT. Perkebunan Nusantara-I, Langsa
No full textEvaluation of Land Suitability Criteria for Oil Palm at Kebun Baru PT. Perkebunan Nusantara-I, LangsaABSTRACT. The obtain land suitability classes in accordance with plant production, the appropriate of land suitability classification from land suitability classification system is required. The aims of this study were: (1) to evaluate the suitability of classification system for land planted with oil palm at Kebun Baru PT. Perkebunan Nusantara I Langsa and (2) to evaluate the relationship between soil characteristics (criteria) and the production of oil palm in the Kebun Baru PT. Perkebunan Nusantara I Langsa. The characteristics observed in the area of land that formed homogenous classes were based on the uniformity of slope, soil type on the rate of oil palm production. From each homogenous area soil samples were taken for analyze of physical and chemical soil properties. The result showed there was none of the system of land suitability classification can be applied directly in Kebun Baru PT. Perkebunan Nusantara I Langsa. A significant correlation was found among the land characteristics and slope was very evident and determined other land characteristics, including the production of oil palm. The oil palm production in Kebun Baru PT. Perkebunan Nusantara-I Langsa was determined by slope, C-organic, P-available, K-exchangeable, Ca-Exchangeable, base saturation, and salinity. The relationship between oil palm production and land characteristics was described as multiple regression: Y = 5,55 0,41x1 + 2,77x6 + 0,24x8 + 8,57x9 - 1,96x10 + 0,39x13 2,83x14; R2 = 0,93** x1 = Slope, x6 = C-organic, x8 = P-available, x9 = K-exchangeable, x10 = Ca-exchangeable, x13 = base saturation, x14 = salinity; R = determination value. To achieve the best fit between the classification of land suitability and oil palm production in Kebun Baru PT. Perkebunan Nusantara I Langsa, the modification of land suitability classification system is required
Pengendalian Erosi dan Limpasan Permukaan Menggunakan Teknik Mulsa Vertikal pada Budidaya Jeruk Manis di Lahan Miring
No full textControlling of Soil Erosion and Run-off by Vertical Mulch Technology on the Citrus Cultivation at Hill SlopeABSTRACT. The effects of vertical mulch applications on erosion control and run-off, also soil properties and fertility on citrus cultivations at hill slope had been done in July to November, 2007 in buffer zone of Gunung Leuser National Park, Rumah Galuh Village, Sei Bingei Sub-district, Langkat district, with 560 meters altitude, and 22,5% land slope. Two vertical mulch application are: vertical mulch having the same aim with contour line, and ring vertical mulch. The conservations methods were studied are pile having the same aim with contour line, pile ring, ring of mulch in gunny-sack. Two control experiments are: horizontal mulch application, and without mulch application. These result are: vertical mulch applications could control erosion and run-off and affected physical and chemical soil properties better than horizontal mulch application. The best of conservation methods application where controlling erosion and and run-off are contour pile and mulch in gunny-sack, and affected on soil physical and biological properties are ring vertical mulch, but for affecting soil chemical properties are mulch in gunny-sack
Pengaruh Laju Pengeringan Terhadap Perubahan Fisiologi BENIH Avicennia marina (Forsk.) Vierh.
No full textThe Effect of Drying Rate on Physiological Changes in Seed of Avicennia marina (Forsk.) Vierh.ABSTRACT. Avicennia marina seed has been classified a highly recalcitrant that need the right handling for maintaining seed viability. The objective og this study was to investigate physiological, biochemical, anatomical changes at various drying rate, fast, medium and slow drying. Seed moisture content, germination percentage, speed of germination, index of vigor, time to reach 50% germination, electrolyte leachates, oligosaccharide content were determined, and anatomical of embryonic axes was observed at various times durng desiccation. The result of the experiment show that the moisture content of A. marina seed was 60.75-64.67% at shedding. Time to reach the lowest moisture content (32-33%) at fast, medium and slow drying were 6, 10 and 14 days, respectively. First and final count in germination test were 13 and 22 days. Critical moisture content of seed based on time to reach 50% viability (P50) were 37.25, 43.28, and 45.92% for fast, medium and slow drying, respectively. The critical moisture content based on speed of germination were 36.51, 42.47, and 45.01% for fast, medium and slow drying, respectively
Implikasi Keberadaan Spesies Invasif Eceng Gondok Terhadap Komunitas Srangga Herbivor
No full textImplication of the Existance of Invasive Species-Water Hyacinth on Communities of Herbivorous InsectABSTRACT. The introduction of an invasive exotic plant species may indirectly influence herbivorous insects community. The objective of the research is to evaluate the implication of the existence of invasive species-water hyacinth on herbivorous insect community. The research was done in several freshwater ecosystems occupied by water hyacinth in West Java and DKI Jakarta, conducted during January 2004 to March 2006. Sweep net and yellow pan trap were used to collect the sample of insects. The result of the research showed that the existence of water hyacinth may indirectly resulted in decreasing of species richness and diversity of herbivorous insect. The observation also showed that the existence of water hyacinth may lead to homogenezation of the insect in aquatic vegetation
Kajian Awal Varietas Kopi Arabika Berdasarkan Ketinggian Tempat di Dataran Tinggi Gayo
No full textEarly Study on Arabica Coffee Varieties Base on Altitude Position on Gayo Highland AreaABSTRACT. Farmer cultivated mixed-varieties of arabica coffee in an area. As result no specific tasted for specific variety found. This result aims to observe the best coffee to be recommended for various altitude cultivation. There are nine altitude variations, 100 m interval from 700 to 1600 m above sea level (asl). For each internal altitude, coated-red coffee been harvested at farmers coffee farms at almost the same management and growth. The variables of arabica coffee bean quality physically observed were coated-red raw bean, coffee beans, coffee quality , beans passed on various filters, bean shape and tasted. The result showed that arabica coffee bean quality physically is getting better till 1400 m asl and then tends to decrease the quality till 1600 m asl as shown in export quality percentages, no passed at 7.50 mm filter, the percentage of normal beans, and tasted scores. However for coated-red raw asl. In contrast, floating coated-bean, floating bean and normal beans is decrease. Catimor Jaluk Variety of coffee arabica is suitable for all altitudes observed, followed by arabusta, Lini-S, Bergendal, and USDA. To avoid the dissimilarity of specific taste to highland arabica coffee, the varieties could be extended at different areas even though the same altitude
Penilaian Karakteristik Lahan untuk Kedelai di Kabupaten Bireuen
No full textAssesments of Land Characteristics of Soybean at Bireuen DistrictABSTRACT. Bireuen district has been known as soybean production centre in Aceh Province. However, average yield obtained is still under national yield. This research aimed: (1) to find out a relationship between land suitability and soybean yield, (2) to evaluate a relationship between land characteristics and soybean yield, (3) to determinate the land characteristics as determinable factor for soybean yield. There were nine characteristics sites were used under soybean farming that have land heterogeneity among sites and homogeneity within sites: 4 under rice field and 5 under rainfed. Natures of land morphology was evaluated each sites, and then soil samples were taken for soil properties evaluation in laboratory. The parameter of land morphology properties, physical and chemical were then adjusted according to the need of land suitability for soybean. Level of land management and its yield done by farmers were also evaluated. Yield from each plot (2 x 3 m2) was at random determined. The land suitability class was determined by comparing the land characteristics/land quality with soybean growth specification. Criteria made by Agriculture Department was used as a guidance. Futhermore, in order to determine determinable land characteristics were arranged in multiple linear regression analyses, in which yield of soybean as a Y and land characteristics as a X. Research result showed that the class of land suitability established were in parallel with soybean yields measure under relatively good management plots. Of the land characteristics that can be used as determinable factor were slope, rainfall, texture, drainage, and nutrient storage (pH). A multiple linear regression equation was established for soybean yield as follow: Y= -1.133 0.018X1 + 0.001X2 0.001X3 + 0.009X4 + 19.555X5 + 0.025X6 + 0.781X7 0.019X8; R2= 0.98, where : X1 = slope, X2= soil susceptibility to erosion, X3= rainfall, X4= sand fraction, X5= N-total, X6= P-available, X7= K-exchange, X8= base saturation, and R2= determination coefficient
Penentuan Kapasitas Adsorpsi Maksimum dan Energi Adsorpsi Herbisida Paraquat (1,1-Dimetil-4,4-Bipiridilum Diklorida) pada Tanah Pertanian
No full textDetermination of Paraquat (1,1,-Dimethyl-4,4-Bipyridilium Dichloride) Maximum Adsorption Capacity and Adsorption Energy on Farm SoilABSTRACT. The purpose of this research to determination of paraquat (1,1,-Dimethyl-4,4-Bipyridilium Dichloride) maximum adsorption capacity and adsorption energy. Maximum adsorption capacity and adsorption energy were predicted by Gibbs free energy, G. The paraquat adsorption to show reversible properties and therefore Gibbs free energy can determinate by equilibrium constant, K. Maximum adsorption capacity were 18,811 mg/g (0,000101 mol/g) and Gibbs free energy was -25360 kJ/mol for 1100C soil