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All Journal HAYATI Journal of Biosciences Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut Journal of Tropical Soils
. DARMAWAN
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Environmental Science

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Journal : Journal of Tropical Soils

 1 
Land Suitability Criteria for Intensively Managed Cavendish Banana Crop in Way Kambas East Lampung, Indonesia Ansyori, .; Sudarsono, .; Poerwanto, Roedhy; Darmawan, .
JOURNAL OF TROPICAL SOILS Vol 15, No 2: May 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i2.159-167

Abstract

Land Suitability Criteria for Intensively Managed  Cavendish Banana Crop in Way Kambas East Lampung, Indonesia (Ansyori, Sudarsono, R Poerwanto, and Darmawan): Banana as one of the pre-eminent products of horticultural crop has a very important role in the growth of agricultural sector.  The research aimed to study the land characteristics which influence the Cavendish banana crop yield and proposing the land suitability classification criteria for the land utilization type of Cavendish banana crop with intensive management which has been tested based on the production rate in the field.  For this purpose, there were 36 observation land units specifically designed by considering factors such as soil subgroups, slopes, land utilization types, and land productivity levels.  At each observation land unit, the land utilization types and land characteristics were indentified.  The relation between land characteristics and production was tested with correlation and regression analysis.  The results of some statistical tests were contrasted and then selected as the basis to develop the land suitability classification criteria for Cavendish banana crop which was intensively managed.  The research findings indicated that the banana crop yield levels were significantly influenced and determined by the land characteristics of soil bulk density, cation exchange capacity, soil permeability, total porosity, exchangeable sodium percentage, soil textural class, and soil erodibility.
The Long-Term Effect of Blanket Phosphorus Fertilizer Application on the Available P Content in Sawah Soils; Comparative Study in Java, Indonesia Darmawan, .; Kyuma, Kazutake; Masunaga, Tsugiyuki; Asmar, .; Darfis, Irwan; Wakatsuki, Toshiyuki
JOURNAL OF TROPICAL SOILS Vol. 14 No. 1: January 2009
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2009.v14i1.9-18

Abstract

In order to evaluate the effects of long-term phosphorus fertilizer application on the sawah soils, a comparative study was conducted in Java Island as a pioneer of Green Revolution (GR) technology application in Indonesia. Soil samples taken in 1970 by Kawaguchi and Kyuma were compared with new sample taken from the same site or the sites close to 1970 in 2003. The results showed that available phosphorus (P) sharply increased during the study period. The average content of available P in topsoil layer changed from 10.5±11.6 mg kg-1 P in 1970 to 19.6±22.4 mg kg-1 P in 2003, or increased by 118%. Long-term application of 125 kg super-phosphate [Ca(H2PO4)2] per hectares per cropping season as P fertilizers was also affected the profile distribution of available P in whole sites studied, especially in Vertisols. The land management differences between seedfarms planted with rice in monoculture systems whole study period and non-seedfarms cultivated rice and upland crops in some rotation patterns found affected the changing rate of available P in the soils. During the period of 1970-2003, average content of available P in seedfarms changed from 15.7±16.2 mg kg-1 P to 31.1±29.1 mg kg-1 P, while in non-seedfarm from 6.9±8.7 mg kg-1 P to 11.5±8.2 mg kg-1 P in 1970 and 2003, respectively. The great variation on the changing rate of available P observed in this study indicated that general chemical fertilizers recommendation in Indonesia was caused excess P input in some sites, but insufficient in others. To avoid the adverse effect of P fertilizer application in the future, recommendation of P should be based on the site characteristic and taking into account of natural resources contribution.
Land Suitability Criteria for Intensively Managed Cavendish Banana Crop in Way Kambas East Lampung, Indonesia Ansyori, .; Sudarsono, .; Poerwanto, Roedhy; Darmawan, .
JOURNAL OF TROPICAL SOILS Vol. 15 No. 2: May 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i2.159-167

Abstract

Land Suitability Criteria for Intensively Managed  Cavendish Banana Crop in Way Kambas East Lampung, Indonesia (Ansyori, Sudarsono, R Poerwanto, and Darmawan): Banana as one of the pre-eminent products of horticultural crop has a very important role in the growth of agricultural sector.  The research aimed to study the land characteristics which influence the Cavendish banana crop yield and proposing the land suitability classification criteria for the land utilization type of Cavendish banana crop with intensive management which has been tested based on the production rate in the field.  For this purpose, there were 36 observation land units specifically designed by considering factors such as soil subgroups, slopes, land utilization types, and land productivity levels.  At each observation land unit, the land utilization types and land characteristics were indentified.  The relation between land characteristics and production was tested with correlation and regression analysis.  The results of some statistical tests were contrasted and then selected as the basis to develop the land suitability classification criteria for Cavendish banana crop which was intensively managed.  The research findings indicated that the banana crop yield levels were significantly influenced and determined by the land characteristics of soil bulk density, cation exchange capacity, soil permeability, total porosity, exchangeable sodium percentage, soil textural class, and soil erodibility.
Changes of Soil Properties on Various Ages of Rubber Trees in Dhamasraya, West Sumatra, Indonesia Yasin, Syafrimen; Adrinal, .; Junaidi, .; Wahyudi, Erick; Herlena, Silvia; Darmawan, .
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.221-227

Abstract

Changes of Soil Properties on Various Ages of Rubber Trees in Dhamasraya, West Sumatra, Indonesia (S Yasin, Adrinal, Junaidi, E Wahyudi, S Herlena and Darmawan): Although rubber has been planted in Indonesia from Holland era, but there is little information about the effect of rubber plantation on the rate of land degradation in Indonesia.  In order to examine the effect of rubber tree (Hevea brasiliansis) ages on land degradation status, a series experiment was done in Dhamasraya district as the main contributor of natural rubber in West Sumatra, Indonesia. Study site divide  into forest (A), crab grass (B), and rubber plantation with ages ranged from 1 (C), 5 (D), 10 (E), 15 (F) and 20 (G) years were selected as study sites and soil samples had been taken from each site, where forest soil  was used as a control. The result proved that the age of rubber tree has strongly affected physical and chemical properties of soil. Organic carbon and total nitrogen content decreased from 3.02%, 2.66%, 1.96%, in site A, B and C, and then increased to 2.33% and 2.49% in site D and E, respectively. This result was opposed with bulk density (BD) value of each site. The highest BD found in site C (1.26 g cm-3), followed by site D, E, B and A with 1.24, 1.14, 1.12 and 0.88 g cm-3, respectively. The similar pattern was also found for selected chemical properties of soil. Soil pH, available phosphorous, exchangeable base cations, cation exchange capacity and base saturation was likely to decrease from 1 to 10 years old plantation and then increased close the natural condition (reflected by forest soil) at 20 years old rubber tree. Since most of plantation was conversed from natural forest, this phenomenon might be because of contribution of organic matter from original condition and addition of fertilizer at the beginning of plantation establishment.
The Properties of Humic Acids Extracted from Four Sources of Organic Matters and Their Ability to Bind Fe2+ at New Established Rice Field Herviyanti, .; Prasetyo, Teguh Budi; Ahmad, Fachri; Darmawan, .
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.237-244

Abstract

The Properties of Humic Acids Extracted from Four Sources of Organic Matters and Their Ability to Bind Fe2+ at New Established Rice Field (Herviyanti, TB Prasetyo, F Ahmad and Darmawan):  In order to identify the properties of humic acid extracted from four kinds of organic matters (a peat soil, a stable manure, a compost of rice straw and a municipal waste)  and their potentiality to bind Fe2+  at new established rice field, a series of experiment was done in Soil Laboratory Faculty of Agriculture, Andalas University Padang. First step was characterization of functional groups and other chemical properties of humic acids, and their reaction with Fe2+. The second step was to examine the ability of humic acids to bind Fe2+ solution at new established rice field by conducting incubation experiments.  The experiment used  a completely randomized design with three replications.  The 450 ppm Fe solution was treated with 0, 50, 100, 150, 200, 250, 300, 350, 400, and 450 ppm humic acids and incubated for 24 hours.  While top soil samples taken from Sitiung, West Sumatera were treated with 0,100, 200, 300, and 400 ppm humic acids, flooded with deionized water, and incubated for 6 weeks.  The result showed that   the functional group and other chemical characteristic of humic acid from rice straw compost and peat soil were better than those of manure and municipal waste compost. Functional group of both humic acids was dominated by COO-. High reactivity of the humic acid had been found when humic acids were added to Fe solution with ratio 1 : 1. Use of humic acid extracted from peat soil with the levels from 0 to 100, 200, 300, and 400 ppm decreased the Fe2+ concentration from 1.361 ppm to  910, 860, 831, and 776 ppm, respectively at new established rice field.  While the use of humic acid extracted from  rice straw compost with the same levels as above decreased the Fe2+ concentration  from 1361 to 770, 701, 612, and 600 ppm, respectively, after four weeks of flooding.
Nitrogen and Phosphorous Movement Characteristic in Terrace Paddy Field Using Cascade Irrigation System in West Sumatra, Indonesia Darmawan, .; Yasin, Syafrimen; Masunaga, Tsugiyuki
JOURNAL OF TROPICAL SOILS Vol. 16 No. 2: May 2011
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2011.v16i2.129-138

Abstract

West Sumatra is one of Indonesian rice bowl. The landscape of this province dominated by mountainous area with beautiful terrace paddy field lied from the middle slope to the lowland. The most common rice cultivation management in this area is application of cascade irrigation system with blanked amount of chemical fertilizer application. This study intends to figure out, whether this kind of paddy field management sustains and friendly to the environment or not. The results showed that cascade irrigation system created some discrepancies in suspended solid (SS), dissolve organic matter (DOM) and the nutrient movement characteristic a long the slope. The SS and DOM load and discharge strongly influenced by land preparation activities, while total and available nitrogen (N) and phosphorous (P) affected by chemical fertilizer application. In the upper part, the amount of chemical fertilizer seemed sufficient, indicated by negative amount of nutrient balance, while lower terrace show some indication of excess nutrient input. To avoid some demerit of cascade irrigation system, chemical fertilizer application should be base on site specific characteristic and taking into account of natural source contribution.Keywords: Cascade irrigation, chemical fertilizer, nutrient balance, terrace paddy field
Slow- Release Fertilizer Formulation Using Acrylic and Chitosan Coating Handayani, Lili; Djajakirana, Gunawan; Darmawan, .; Munoz, Canecio Peralta
JOURNAL OF TROPICAL SOILS Vol. 20 No. 1: January 2015
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2015.v20i1.37-45

Abstract

The low-efficiency problem in fertilizer application can be overcome by controlling fertilizer solubility, i.e. by rendering the fertilizer to be released gradually; such material is also known as slow-release fertilizer (SRF). This research was aimed to formulate SRF by coating technique using acrylic and chitosan as the coating material, and to evaluate fertilizer resistance to too fast disintegration, and rate of nutrient release method. The results demonstrated that fertilizer formulation containing N, P, K, Fe, Cu, and Zn with granulation technique yielded 74% of granules with 2-5 mm in diameter. The SRFs (formulated fertilizer with acrylic or chitosan coating) were more resistant to water pounding than non-SRF. Furthermore, shaking test with distilled water or 2% citric acid, or by percolation test with distilled water showed that the SRFs had lower nutrient solubility than the non-SRFs. The results of shaking test also specifically indicated that coating with acrylic made the fertilizer more resistant to the citric acid,suggesting that this coating material would be more suitable in acidic soils. The SRFs formulated with the addition of chitosan during blending of micronutrients prior to mixing with macronutrients, granulation, and final coating exhibited lower nutrient solubility than the SRFs without the pre-coating chitosan addition. [How to Cite: Lili H, G Djajakirana, Darmawan, and CP Munoz. 2015. Slow- Release Fertilizer Formulation Using Acrylic and Chitosan Coating. J Trop Soils 19: 37-45. Doi: 10.5400/jts.2015.20.1.37][Permalink/DOI: www.dx.doi.org/10.5400/jts.2015.20.1.37]
Co-Authors . Adrinal . HERVIYANTI . Ismail . Junaidi . SUPUTA Aditya Setianingtyas Ahmad, Fachri Ansyori, Ansyori Asmar, . CIPTO WALUYO Darfis, Irwan Gunawan Djajakirana Hari Purnomo Hari Sutrisno Herlena, Silvia Iman hidayat Karyanto, Karyanto Kyuma, Kazutake Laksono Trisnantoro Lili Handayani, Lili M. Fedi A. Sondita Masunaga, Tsugiyuki Munoz, Canecio Peralta NUNUK WIDYASTUTI Nurani, Tri Widji Roedhy Poerwanto ROSICHON UBAIDILLAH SISWO POLANDONO Sudarsono Sugih Suryagalih Syafrimen Yasin Teguh Budi Prasetyo Wahyudi, Erick Wakatsuki, Toshiyuki