. Suwardi
Center for Nuclear Fuel Technology - BATAN

Published : 7 Documents

Found 7 Documents

METODE AMMI PADA MODEL CAMPURAN Suwardi, .; Mattjik, Ahmad Ansori; Susetyo, Budi

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Metode AMMI (Additive Main Effects and Multiplicative Interaction) adalah suatu metode analisis yang menggabungkan pengaruh utama aditif pada analisis ragam dengan penguraian bilinear pengaruh interaksi ganda. Dalam berbagai penelitian agronomi metode ini mampu menjelaskan lebih efektif pengaruh dan pola struktur interaksi antara genotip dengan lingkungan. Metode AMMI dapat diterapkan pada model campuran jika pengaruh acak pada faktor interaksi dipandang sebagai pengaruh tetap. Sebagai ilustrasi penerapan, penelitian ini menggunakan data produksi padi gogo (ton per hektar) dari hasil percobaan multi lingkungan.
Jurnal Humaniora Vol 21, No 3 (2009)
Publisher : Faculty of Cultural Science Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2763.425 KB) | DOI: 10.22146/jh.971


Javanese in their daily life, usually used traditional faithfully called kramaniasi as expression of Javanese sexuality teaching medium. The Javanese traditional utterance was naturally considered as sexuality expression medium. The expression was also a combination between semantic meanings and culture. Parents, in the etnich of Eastern ethics society (Javanese), usually gave sexual lesson using traditional utterance specifically to their daughters. The etnich expression use in Java was considered easier to teach sexual education to girl in society.
Jurnal Ilmu Pertanian Indonesia Vol. 18 No. 2 (2013): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Soils in Indonesia are mostly dominated by soils having poor physico-chemical properties such as low pH, low organic matter, and very low nutrients. Consequently, agricultural production of the land are very low. Recently, application of chemical fertilizers that was mostly without organic matter addition has caused a decline of soil organic matter content. Soil physical properties become increasingly hard due to structural damage and less development of most soil microorganisms. In such conditions, soils become less responsive to fertilization and agricultural production is leveling off. Efforts to overcome the barriers of soil properties have been done to increase production of food crops. Some reports showed that an active material of humic acid increase the agricultural production. The humic acid is extracted from organic materials. The result of this study showed that application of 15 L/ha humic acid with zeolit carrier 10 kg/L humic acid increased the production of paddy by 15% and corn by 7%. The increase of crop production is due to development of roots that can stimulate the absorption of more nutrients.
UTILIZATION OF NATURAL ZEOLITES AS CU (II) AND ZN (II) ADSORBENT Dewi, Evi Mutiara; Suwardi, .; Suryaningtyas, Dyah Tjahyandari; Anwar, Syaiful
Journal of Tropical Soils Vol 21, No 3: September 2016

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2016.v21i3.153-160


This research was aimed to determine the differences of physical and chemical characteristics from three natural zeolites from Tasikmalaya, Bayah and Lampung areas and to examine the characteristics of the natural zeolite adsorption capability to the micro-nutrients. The zeolite characterization analysis included some variables i.e. mineral types, morphologyand pH, CEC (Cation Exchange Capacity), BSP (Base Saturation Point), Cu and Zn content of zeolite.  Analysis of natural zeolite adsorption characteristics were done by Batch System. Data interpretation were done by  using the isothermal adsorption equation of Langmuir, Freundlich and Brunauer-Emmett-Teller (BET).The results showed that zeolite from Bayah and Tasikmalaya had a similiar morphology and it was categorized as mordenite types and platy structure, while zeolite from Lampung was a clinoptilolite type and tabular structure. The CEC of Tasikmalaya zeolite (137.58 cmol(-)kg-1) was higher than Bayah (96.75 cmol(-)kg-1) and Lampung (87.72 cmol(-)kg-1). Adsorption capability at the Langmuir equation of Cu by Bayah zeolite (47.619 mg g-1) was higher than Lampung (33.333 mgg-1) and Tasikmalaya (28.571 mg g-1). Effective adsorption of Zn by Bayah zeolite 19.417 mg g-1 was higher than  Lampung (16.949 mg g-1) and Tasikmalaya (1.395 mg g-1).
Journal of Tropical Soils Vol 21, No 1: January 2016

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2016.v21i1.27-32


Paddy soil has different morphology and pedogenic characteristics compared to dry land, due to the influence of inundation during several months in a year. Puddling and drying that occurs in turns (redox cycle) in paddy soil can lead to the formation of concretions or rusty Fe and Mn. The main purpose of this study was to understand the changing of the morphological and chemical properties as a result of changing of the dry land to paddy soil. Besides, the study also aimed to understand plow pan layer formation in Podsolic, Latosol, Regosol, and Andosol soil type. Results showed that content of soil density (bulk density) of dry land ranged from 0.5  to 1.0, while paddy soil is 0.8 to 1.0 (g cm-3).  Bulk density values in all four types of soils increased after the changing. Observation also demonstrated that severity levels of paddy soil is higher than dry land, especially in the second and third soil layers or under the surface of soils. Acidity of dry land was likely to be higher than paddy soil. There were no significant differences in nutrient such as C-organic, P and N. Meanwhile, using dithionite as solvent, paddy soil has higher Fe, Mn, and Al content than that of dry land, and remain the same when extracted with pyrophosphate and oxalate. From the four types of soil observed,the paddy soil showed formation of plow pan layer. This was shown by the soil severity level higher than the topsoil or other layers. Paddy soil had unique properties due to redox reaction, thereby providing soil discoloration i.e darker due to high solubility of Fe, Mn, and Al.Keywords: Concretion of Fe and Mn, paddy soil, pedogenesis, plow pan layer [How to Cite: Kurniati, Sudarsono and Suwardi. 2016. Characterization of Several Paddy Soil Types in Bogor, West Java, Indonesia . J Trop Soils 21:. 27-32. Doi: 10.5400/jts.2016.21.1.27]
Sustainability Index of Rice Field for Supporting Spatial Planning (Case Study in Jember District, East Java) NURWADJEDI, .; MULYANTO, BUDI; SABIHAM, SUPIANDI; PONIMAN, ARIS; SUWARDI, .
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 32 (2010): Desember 2010
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.2017/jti.v0i32.150


Rice Field agriculture in Jember district is a main sector due to its contribution to rice production in this region. The objective of this study is to determine the rice field sustainability index based on agro-ecosystem zone and to formulate policy alternatives for supporting the spatial planning in achieving sustainable rice field agriculture. The study used the primary andsecondary data which include biophysical environment, economy, social and culture. The data analysis used GIS (Geographic Information System) modelbase, factor analysis, and AHP (Analytical Hierarchy Process). The results showed that the sustainability index of the rice field agro-ecosystem zones were different. The threats of the rice field sustainability were causedby the main indicators of the biophysical environment, economy, social, and culture such as water availability, soil nutrients of Carbon organic content, Nitrogen, and Phosphor-available, profit, fertilizer access, land conversion, land ownership and fragmentation, farmer education, and age of farmer. To overcome those threats, the policy consideration was more dominantly determined by the biophysical factor rather than that of theeconomy, social, and culture. The implementation of the policy tohandle the threats needs to be coordinated among the stakeholders, considering that the rice field resource can be categorized into a common pool resource.
Hearing treshold before and after middle ear surgery in chronic suppurative otitis media (CSOM) Rianto*, Bambang Udji Djoko; Suwardi, .; Samodra, Edhie
Journal of the Medical Sciences (Berkala Ilmu Kedokteran) Vol 50, No 2 (2018)
Publisher : Journal of the Medical Sciences (Berkala Ilmu Kedokteran)

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Hearing loss is a common symptom in chronic suppurative otitis media (CSOM),often cause social communication disturbance. Canal wall up tympanoplastyand canal wall down tympanoplasty are surgery procedures for managing thisdisease that no response to convensional treatment. These surgery proceduresshould consider to hearing function impact. The aim of this study was to evaluatethe difference hearing threshold between before and after middle ear surgeryon CSOM patients. It was an historical cohort study conducted from January2015 to December 2016 involving CSOM patients who underwent canal wall uptympanoplasty surgery and canal wall down tympanoplasty in The Otology Division,Departement of Ear, Nose, Throat, Head and Neck Health, Dr. Sardjito GeneralHospital, Yogyakarta. The inclusion criteria included basic data, diagnostics,surgery reports, and audiometry results before and 3 months postoperatively,while the exclusion criteria were not complete medical record data. Total of 64patients with CSOM were involved in this study consisting of 32 patients whounderwent canal wall up tympanoplasty and 32 patients who underwent canal walldown tympanoplasty. Significantly different in the increasing of hearing thresholdbetween before and after canal wall up tympanoplasty surgery compared to thecanal wall down tympanoplasty was observed (p = 0.021). In addition, surgicaltechnique was the main factor affecting postoperative hearing threshold in CSOMpatients (p < 0.05). In conclusion, the increasing of hearing threshold in CSOMpatients underwent canal wall up tympanoplasty surgery is better than those underwentcanal wall down tympanoplasty.