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Jurnal Ilmu Tanah dan Lingkungan (Journal of Soil Science and Environment)

jtanah
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Published by Institut Pertanian Bogor

ISSN : 14107333 EISSN : 25492853 DOI : -

Core Subject : Agriculture, Social,

Agriculture, Biological Sciences & Forestry Environmental Science

Jurnal Ilmu Tanah dan Lingkungan merupakan media yang menyajikan artikel mengenai hasil penelitian dan telaah perkembangan mutakhir dalam bidang ilmu tanah, air, dan ilmu lingkungan sebagai bahan kajian utama.

Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Tanah

Articles 265 Documents

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A Decision Support System for Rice Cultivation on Acid Sulfate Soils in Malaysia Totok Suswanto; Shamshuddin Jusop; S.R. Syed Omar; C.B.S. The; Peli Mat
Jurnal Ilmu Tanah dan Lingkungan Vol 7 No 1 (2005): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Ameliorative steps to put acid sulfate soils into productive use can be organized by a decision support system. The model uses microeconomic analysis to get an optimal rate of lime and fertilizer in maximizing profit. A glasshouse experiment was conducted on an acid sulfate soil in Malaysia to get the potential yield. A field trial was conducted for validation purposes. The recommended rate of fertilizer application of 150-200 kg ha-1 N. 20-30 kg ha-1 P and 150-200 kg ha-1 K were applied during the critical stage of the rice growth. Field Adjusting Factor (FAF) of 0.40 has been found and this was used to analyze the production function. Using TableCurve 3D software. an equation for production function was established. Validation using experimental data showed that the equation has a good capability. shown by the value of p>0.2 (t-test) and MEE of 2%. The model. named as RiCASS (Rice Cultivation on Acid Sulfate Soil) was developed and successfully simulatedthe maximal profit under 4 different scenarios. The recommended rate of lime (GML) was 6.5 t ha-1 for maximal profit and 2.5- 3.0 t ha-1 for the farmers, practice. Keywords: Acid sulfate soil. decision support system. field adjusting factor. lime. rice

The Role of Rock Phosphate and Farm Yard Manure Combined-Phosphate-Solubilizing Bacteria in Increasing Nutrient Uptake and Soybean Yield Aidi Noor
Jurnal Ilmu Tanah dan Lingkungan Vol 7 No 2 (2005): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

The aims of the experiment were to evaluate the effect of rock phosphate application and combination betweenphosphate-solubilizing bacteria with farm yard manure on nutrient uptake and yield of soybean. Factorial experiment design with two factors was used in randomized complzte block design with three replications. The first factors was level of rockphosphate i.e. : 0; 30; 60; 90 kg P ha· I, and the second factor was combination of phosphate solubili=ing bacteria andfarm yard manure: without phosphate solubi/i=ing bacteria andfarm yard manure; phosphate solubilbing bacteria (Pseudomonas fluorescens); farm yard manure 10 ton ha"I, and phosphate solubilizing bacteria + farm yard manure. The results indicated that rock phosphate and combination of phosphate solubilizing bacteria andfarm yard manure application increased nutrient (N, p, K) uptake and grain yield of soybean. Optimum dosage of rock phosphate in soil without phosphate-solubilizing bacteria andfarm yard manure (control) was 72.15 kg P hdl which gave maximum yield of soybean was 7.73 g pori. While with phosphate-solubilizing bacteria. farm yard manure and phosphate solubilizing bacteria+farm yard manure obtained optimum dosage of rock phosphate were 62.26, 63.94, and 62. 21 kg P hd1 , respectively, which gave maximum yield of soybean were 8.17, 7.95, and 8.43 g pori, respectively.

Effect of Placement Method of Crop Residue and Irrigation on Soil Physical Properties and Plant Production Dwl Putro Tejo Baskoro
Jurnal Ilmu Tanah dan Lingkungan Vol 7 No 2 (2005): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

A proper management of crop residue can increase crop production since it plays an important role on increasingwater availability. The effect of crop residue application on soil productivity depends on many factors. In this research. theeffect of placement of crop residue and irrigation on soil physical properties and crop production were examined under field condition on dry season. The result showed that crop residue placement had no significant effect on all parameters of measured soil physical properties both under dry condition (no irrigation) and wet condition (with irrigation). The effects ofcrop residue placements on maize growth were also not significant. Nevertheless there was a tendency that surface application produced higher biomass than buried application. On grain yield, however. the effect of crop residue placement was significant. especially under dry condition with no water applied Surface application of crop residues produced higher grain yield than buried application.

Exploration of Methanol Utilizing Microbes From Soil and Dung, as Source of Single Cell Protein Fahrizal Hazra
Jurnal Ilmu Tanah dan Lingkungan Vol 7 No 2 (2005): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

The objectives of this research were to explore methanol utilizing microbes by isolation. selection and collection ofmethanol utilizing microbes from soil and dung. further it will be produced as single cell protein.The experiment covers two steps. i.e. I) Sampling of soil and dungfrom Bogor. Cianjur and Karawang. 2) Laboratoryactivity. consisted of: isolation. selection. identification and collection. The microbes were isolated by using the medium ofTani. et al (/982) and its modification. whereas the methanol utilizing microbes were identified by using standard method ofBergeys Manual of Determinative Bacteriology edition Ijh (/994) and Balow et al. (/99 I). The microbes were then proliferatedby using Medium of Mimura et al. (1978) and its modification. Furthermore the cell were harvested and measured itsnitrogen content. The collection of methanol utilizing microbes was conducted with the standard procedure of soilmicrobiology.This research indicated that from 72 samples of soil and dung were obtained 56 isolates of methanol utilizing microbesthat diverse in number and types. Most of methanol utili:ing microbes were isolated from soil and dung by methanol medium 1% and /.5 % in pH 5 and 7. From 56 isolates were chosen 12 isolates to be identified and made as a data base. and then upt as culture collection at Indonesian Center for Biodiversity and Biotechnology (ICBB). Laboratory of Microbiology and Environmental Biotechnology PPLH. and Laboratory of Soil Biology. IPB. From the 12 isolates. 2 isolates were classified into methylotrophic group and they have big potency to be exploited in producing single cell protein. i.e. MelhylococCJIS capsulatus and Acidomonas methanolica. Between 2 isolates. Methylococcus capsulatus (T2M 1 P 1 Cianjur) have a big potency to be used as a source of single cell protein. due to their high content of protein. i.e. 6.4%. Both of the microbes were not pathogenic for human and animal.

Significance of Pelleting The Seed with Phosphate and Lime on The Cultivation of Soybean in Acid Soils in Sitiung, West Sumatera Setiyo Hadi Waluyo
Jurnal Ilmu Tanah dan Lingkungan Vol 7 No 2 (2005): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Several experiments containing 2 field, 2 pot and I rhizotron were conducted to develop a low input agricultural practice(pelleting seed) for production of soybean plant (cv. Tidar) on heavily acid soils of Sitiung, West Sumatra. The field and polexperiments were conducted in Sitiung and in the greenhouse at the Agriculture Division, Center for the Application ofIsotopes and Radiation Technology, National Nuclear Energy Agency, Jakarta, respectively, in 1990 - 1992. The rhizotronexperiment was conducted in 1994 at the Laboratory of Microbiology, Department of Agrotechnology and Food Sciences.Wageningen University. Wageningen, The Netherlands. Lime-pel/eting seeds with the equivalent of 50 kg lime ha·1 increased nodulation, growth and yield both in unlimed and limed soils. Considerable increases in nodulatio, growth and yield were obtained when a small amount of P fertiliser (J 0 kg TSP ha·l ) was incorporated in the lime-pellet. The beneficial effects of both lime-pelleting and [lime+TSPj-pelleting were more pronounced on nodulation than on growth and yield. and greater in umimed soils than in limed soils. Large effects were obtained in nodulation, growth and yield of soybean in field experi1ltl!nts by pelleting seeds with lime or with lime + TSP. However, the pel/eted soybean plants grown in unlimed soils remained small and yields were negligible. To sustain growth and production of soybean in these acid soils, adequate quantities of lime and of P fertiliser would be necessary. In the present study, a combination of broadcast lime at 2.0 t ha-I with [lime+TSPj-pelleting of inoculated seeds was found superior to the application of 7.0 t ha-I of lime with inoculated seeds only. A I toxicity and P deficiency were the main problems in these acid soils. For the low-input production of soybeans considerations shOllld be directed to the correction of these factors.

Predicting Spatial Distribution of Argilic Horizon Using Auxilary Information in Regional Scale Yiyi Sulaeman; D Djaenudin
Jurnal Ilmu Tanah dan Lingkungan Vol 7 No 2 (2005): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

For supporting better soil management, the spatial distribution of soils having argilic hori=on (argilic soils) must berecognized and it can be delineate in soil survey mapping activity, but this activity consumes much time and money. This study aimed to build a decision tree model for predicting the spatial distribution of argillic hori=on based on auxiliary information using 3 predicting environmental variables; namely, geomorphic sUrface or substrate, landsurjace unit, and ecoregion beh.Three-based modeling technique was used to generate classification tree model from 318 pedon of Lampung Province,Indonesia. Argillic horizon is predicted to present in hot belt (elevation of 0-200 m above sea level) on interfluve-seepageslope with probability 84% for acid igneous rock, 83% for basic igneous rock, and 90% for acid sedimentary rock. Argillichorizon is also predicted to present in hot belt on transportational midslope with the probability 65% for transported acid sedimentary rock. Argillic horizon is predicted absent with the probability to occur ranging from 0% to 32% on otlrer combinations of landsurface unit, ecoregion belt, and substrate.

The Effect of Rock Phosphate and Level of Inoculums on The Survivability of Aspergillus niger and Its Solubilization Ability When Pelleted With Rock Phosphate Yudi Sastro; Donny Widianto; Irfan D Prijambada
Jurnal Ilmu Tanah dan Lingkungan Vol 7 No 2 (2005): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

The study is intended to examine the survival of Aspergillus niger and its phosphate solubilizing ability when pelletedwith rock phosphate. An A. niger YD 17 obtainedfrom the Laboratory of Microbiology. Faculty of Agriculture, Gadjah MadaUniversity was used. The pellet was made by mixing rock phosphate (80%) with organic matter (J 3. 9% waste of tapioca. 6% rice bran, and 1% starch) and spore of A. niger. The experimental design was the Complete Randomized Design 5x4 with 3 replicatiOns. The first factor was sources of rock phosphate (Christmas Island. Jordan, China, Ciamis, and Madura). The secondfactor was the number ofinoculums i.e. control without inoculums, 107 • J(t and J(t cfu.g·'. The colony of A. niger that formed at medium of potatoes dextrose agar (PDA) and the amount of soluble phosphorus in the Pikovskaya liquid medium were parameters. Experimental results indicated that sources of rock phosphate and the number of inoculums itif1uence the A. niger survivability and its phosphorus solubilizing ability. Rock phosphate from Ciamis gave the best support for fungus survival and rock phosphate from Christmas Island was the best substrate for phosphate solubilization. The highest soluble phosphate was achieved by ul inoculums.

Land Suitability Model for Curry Atang Sutandi; Baba Barus
Jurnal Ilmu Tanah dan Lingkungan Vol 9 No 1 (2007): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Agribusiness of herbal medicine is more important in the future due to raw material pharmaceutical industry tends to usematerials naturally produced To develop herbal medicine with high quality requires the criteria of land suitability based onyield quality, which is represented by active compounds. The compounds are resulted from secondary metabolite that isrelated to environmental conditions. The purpose of this study was to generate the land suitability criteria for curry withcurcuma production base. A total of 49 curry plantation sites were sampled for plant age, productivity, and landcharacteristics, as well as soil and rhizome samples for laboratory analysis. Age-adjusted curcuma production was used as the yield response, which were plotted against land characteristics. Boundary lines confining the resultant scatter of points were then mathematically described. The boundary lines defined curcuma yields that may occur under a given set ofconditions and could be used to determine land suitability criteria. The criteria were done by using projection of lineintersection between boundary line and yield cut off. Land characteristic and curcuma yield relationships had similar pattern, the scalier data were more skewness with higher yields and the scalier confined by boundary lines. By using the lines, every land characteristics that were studied, could be determine to establish land suitability criteria for curry, except for wateravailability and aluminum saturation.

Impact of Fire on Natural Regeneration in Peat Bambang Hero Saharjo; Ati Dwi Nurhayati
Jurnal Ilmu Tanah dan Lingkungan Vol 9 No 1 (2007): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Fire is one of the most effective tools in disappearing vegetation community, where it was depend on the characteristics of burning itself and also the performance of the site being burnt. Previous research in mineral soils showed that repeated burning occurred at the same place trend to clean the vegetation which finally leads to have the land with lower number and quality of species left, while in peat land it was not fully understood. The research objective is to understand the vegetation dynamics following peat fires in the fibric peat type at the land preparation area using fire belong to the local community located in the Pelalawan district, Riau province, Indonesia during the dry season in the year 2001. Before slashing and drying, /0 tree species and 4 species of under storey vegetationfound. The site was dominated by Uncaria glabrata at seedling stage, Garcinia rostrata at sapling stage, Shorea macrophylla at pole stage and Pandanus immersus at understorey. After slashing and followed by 4 weeks drying then continued by burning with high flame temperature range from 8750(; to 900°C, it had been found that 3-months follOWing burning the site was dominated by Garcinia-rostrata at seedling stage and Cyperus halpan at understorey, while 6-months following burning the site was dominated by Eugenia jambos at seedling stage and Cyperus hal pan at understorey. Three months following burning species left to be only 4 species with 115 individuaVha (3 species from original and 1 new species emerge), and at 6 months following burning still 4 species left with 250 individuaVha.Meanwhile in understorey vegetation, 3 months following burning the species increased to be 7 species with 746 individuaVha (3 species left unchanged, I species disappeared and 4 new species emerge) and 6 months following burning the species left still 7 species with 1235 individuaVha. This means thatfire stimulate the increasing number of under storey vegetation.

Phosphorus and Potassium Status in Paddy Soils (Sawah) of Central Lampung Regency Junita Barus
Jurnal Ilmu Tanah dan Lingkungan Vol 9 No 1 (2007): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

The knowledge about the nutrient status in the lowland soils is one of several ways to maintain soil fertility and increasefarmers income. The objective of this study was to evaluate the status of P20J and K20 content in paddy soils (sawah) at Central lampung regency during the year 2001/2002. Composite soil samples were collected in each different soil types based on mapping technical survey of I : 50.000 scale. Composite soil samples consisting of 5 - 10 sub samples were taken from top layer (0 - 20 em) depth. Soil sampling was taken by using grid system, that is I cm2 in the map represented 25 ha in the field p]OJ and K~ potential content determined by HCI 25 %. Data were arranged in a descriptive methode and then classified in to three degrees (high, medium and low). High P was> 40 mg P20s/100 g, medium P was 20;.40 mg P201100 g and law P was < 20 mg P;Os/100 g. High K was > 20 mg K20/100 g, medium K was 10 -20 mg K20 /100 g and low K « 10 mg K~/IOOg). The results shawed that soil p;OJ status in paddy soils (sawah) of Centra Lampung regency were 61,65 % high, 35,84 % medium and 2,65 % low while K20 status were 6,64% high, 16,02 % medium and 77,34% low.

Page 4 of 27 | Total Record : 265

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