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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 6 Documents

Search results for , issue "Vol 7 No 1 (2005): Jurnal Ilmu Tanah dan Lingkungan" : 6 Documents clear

The Potency of Azotobacter spp.Isolated from Tidal Land of South Kalimantan to Produce Indole Acetic Acids (IAA) Fakhrur Razie; Anas Iswandi
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

Tidal land area is considered as the most frigile ecosystems. To open this area as agricultural land has to be donecarefully. To reduce the risk of declining the environmental quality of tidal swa,,!p area due to the agricultural activity, lhearea should be managed properly and Wisely especially when using agrochemicals such as fertilizers and pesticides. Inrelation to this, the use of biofertilizer such as Azotobacter spp, a nitrogen fIXing bacterium and IAA producer, might beimportant thingfor this area.The aims of this experiments was to study the ability of Azotobacter isolated from rice' rhizophere grown in tidalswamp area of South Kalimantan, in producing IAA to stimulate the growth of roots of rice cultivar I R-64. The parametersused to evaluate the effect of Azotobacter inoculation were the increase of the surface area of root, length of roots, totallength of roots, fresh, dry weight of rice IR-64 roots and the growth of root hairs.The results showed that Azotobacter produced less IAA in the media containing Urea (18.28-35.54 ppm IAA) comparedto Azotobacter grown in media without Urea (33.89 - 42.01 ppm IAA). Azotobacter T.M. UNST.3 produced the highest IAA(42.01 ppm), therefore they were able to increase the surface of roots, increase the length and weight of roots of rice cultivarIR-64 compared to other Azotobacter strains. In media containing Urea, Azotobacter RG 3.62 produced the least IAA (/8.29 ppm IAA) compared to other Azotobacter strains. However, this particular Azotobacter strain was able to increase the surface area of root, increased the number of root hairs compared to other strains.

The Rate of S-Element Transformation to Sulfate on Three Kinds of Soils With and Without Addition of Organic Matter H Muhammad; S Sabiham; A Rachim; H Adijuwana
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

Defiency of sulfur were found at many areas of farming in Indonesia. The aim of this experiment was to Icnow the rate ofS-element tranformation to sulfate on three kinds of soil without and added of organic matter. The experiment was conducted using a Randomized Complete Design with factorial pattern consist of two factors and two replications. The first factor is kinds of soil, i.e. Udic Haplusters, Typic Haplustepts, and Oxyaquic Udipsamment. The second factor is dosage of S-element consist offive levels i.e. 20, 40, 60, 80, and 100 mg kg"'. Experiment was arranged in two groups, i.e. without and added 1% of organic matter treatment. Sulfate of each treatment was extracted every ten days by Ca(H]PO.J] content of 500 mg kg"' Pand measured by spectrophotometer on A 432 nm. The result showed that the rate of transformation of S-element to sulfate is significantly affected by kind of soil, S-element dosage, and their interaction. That transformation was on the increase by increasing of time incubation, but the oxidized S persentage was on decrease with an increase of S-element dosage. Addition of organic matter accelerated ransformation of S-element to sulfate on the first stage and decreased with an increase of time incubation.

Phonska Fertilizer Leaching and Its Effect on Spinach Growth and Productivity (Amaranthus tricolor. L) on Latosol with Different Clay Content Ima Sandra Primanti; Oteng Haridjaja
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

Sufficient available water in soil is very essential for plant growth, not only as a nutrient solvent but also to maintainoptimal turgor pressure. Occasionally, additional water supply from irrigation is necessary to achieve optimal soil water,:ondition. The aim of this research was to study leaching of several nutrients correlated to the growth and productivity ofspinach. PHONSKA fertilizer as a source of nutrients was applied to Latosols Darmaga having different clay content. Thetreatments were subjected to different level of water supply resulting in different soil moisture regime. Factorial completelyrandomized design was used for the experiment; the first factor was clay content. Clay content was differentiated between 81% clay (very fine clayey) and 51 % clay (fine clayey). The secondfactor was level of water supply (100, 120, 140 and 160 % ofwater holding capacity).The result of this research showed that the interaction between clay content and amount of water supplied significantlyinfluenced rate of N, P and K leaching, the sum of leached water and also produced plant biomass (P

PENGARUH VALENSI KATION DALAM RUANG-ANTAR LAPISAN VERMIKULIT TERHADAP PEMBENTUKAN DAN KARAKTERISTIK KIMIA ALUMINIUMHIDROKSIVERMIKULIT Iskandar Iskandar
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

Aluminumhydroxy-smectite (AHS), known also as pillared clay, has some specific characteristics such as wide specific surface area, high basal spacing, and stable at significant high temperature. The AHS was produced from smectite and polymer aluminumhydroxy. In the industrial sector, this product can be used as cracking-catalyst, absorber, and molecular sieve up to 500°C. A similar product can be constructed from vermiculite, and the aluminumhydroxy-vermiculite (AHV) is predicted to have better thermal stability than AHS due to a higher charge density of vermiculite that adsorbs more aluminumhydroxy than that of smectite.Related to the above background the objectives of the research were to study the effects of cation valence in the interlayer space of vermiculite using Li and Ml ions in the formation process and the chemical characteristics of AHV. Li and Mg-vermiculites with different particle sizes are reacted with polymer aluminum-hydroxy' at 100 °C temperature. Solution of 2% Locron was used as a source of aluminum-hydroxy. The products were characterized by chemically and mineralogica/~v. The chemical characteristic includes total chemical analysis, whereas the mineralogical characteristic comprises basal spacing identification that was measured with an X-ray diffractometer (XRD). The results indicated that the AHV produced from Li-vermiculite showed peaks of 1.86 nm and 1.41-1.45 nm with increasing intensity of the 1.86 nm peaks as the particle size was finer. The AHV produced from Mg-vermiculite showed only a peak of 1.45 nm, whereas the 1.84 nm peak can on~v be identified as a shoulder. The AHV with a peak of 1.86 nm (AHV-I.86) can keep its basal spacing to 1.68 nm after 3 hours of heating at a temperature of 700°C, whereas the AHV-I.45 nm shrinkages to 1.10/0.98 nm at the same treatments. Chemical analysis showed that the inter/oyer space of the AHV-I.86 consists of more aluminum-hydroxy than that of the AHV-I.45. Ratio o(OH/AI o(the interlayer aluminum-hydroxy in the AHV-1.86 was 2.57, whereas that of the AHV-1.45 was 2.40. Keywords: Aluminum hydroxy-smectite, aluminumhydroxy-vermiculite, a pillared clay, polymer aluminumhydroxychloride, smectite. vermiculite

Population Dynamics of Microarthropods (Oribatida and Collembola) in Rainfed Paddy Field Ecosystem in Pati, Central Java Rahayu Widyastuti
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

A study on population dynamics of microarthropods (oribatids and collembolans) in rainfed paddy field ecosystem inPati, Central Java was undertaken with the aim to evaluate which group of soil microarthropods that dominated in each phase of rain fed paddy field. The soil fauna was collected using a soil corer of20 cm diameter to a depth of 0-15 cm, every 30 days.In the fallow, soil fauna was sampled from 4 randomized points per plot, meanwhile in the rice field phases (dry seeded rice and transplanted rice), it was sampled from 4 randomized points in the fields and in the bunds, respectively. per plot. Soil microarthropods in each season were then extracted in a Berlese funnel extractor.During the fallow phase, the dominant soil microarthropods were Oribatida of the Acari (1200 individual m,l) andsome groups of Collembola, namely Hypogastruridae (/200 individual m:2), Entomobryidae (500 individual m,l) andIsotomidae (620 individual m,2), meanwhile Sminthuridae of Collembola did not appear in this phase. In the rice phase,however, Sminthuridae of the Collembola occurred in high numbers, i.e., 860 individual m,2 (field) and 6/0 individual m,l(bund).Regarding the population dynamics of soil microarthropods in rainfed paddy field, we can assumed that oribatids and some groups of collembolans (Hypogastruridae, Entomobryidae and Isotomidae) play an important role in improving the nutrient availability during the fallow phase. meanwhile the Sminthuridae of collembolan seemed to play such role in the rice field phase. more than the other soil microarthropods.

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

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Prof. Widiatmaka

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Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, Institut Pertanian Bogor, Jl. Meranti Wing 12 Lt 4, Kampus IPB Darmaga, Bogor 16680

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