Judul: The criteria of land suitability for intensively managed cavendish banana crop in Way Kambas East Lampung
Abstrak: Banana as one of the pre-eminent products of horticultural crop has a very important role in the growth of agricultural sector in Indonesia. This research was aimed to find out the land characteristics that influence the Cavendish banana crop yield; to determine the correlation between the factors of land utilization type, soil sub-group, land slope, and land characteristics as well as the banana crop yield; to propose revised the criteria of land suitability classification for the land utilization type of Cavendish banana crop with intensive management which has been tested based on the production rate in the field; to propose some recommendations on the improvement of land management; and also to know the financial feasibility of Cavendish banana cultivation. For this purpose, there were 36 observation land units specifically designed by considering such factors as soil sub-group, land slope, land utilization type, and land productivity level. At each observation land unit, the land utilization type and land characteristics were indentified.
Keyword: land utilization type, land productivity level., soil sub-group, land characteristics, irrigation system employed

Judul: Land Suitability Criteria for Maize and Groundnut Based Land Utilization Types in the Bogor Area, Kriteria kesesuaian lahan untuk tipe penggunaan lahan berbasis jagung dan kacang tanah di daerah Bogor
Abstrak: The existing criteria of land suitability classification for maize and groundnut which have been used to evaluate of land suitability in Indonesia are too general and not used on spesified location of upland agriculture. The parameters and their ratings in the criteria were not tested and verified in the field especially their relationship to the production of crops, therefore the results of land suitability evaluation were often not suited to the potential of land and expected yields. The objectives of the research are: (1) to study the influence of variability of parent materials and soil development to land qualities and crop productivity of maize and groundnut, (2) to identify the limiting factors of defined landuse and minimum data set of land qualities for land suitability evaluation in the wet climate of upland agriculture, and (3) to create the land suitability criteria for maize and groundnut based land utilization types with low and medium inputs. Variability of parent materials and soil development strongly influenced the land qualities of nutrient retention and toxicity which are determined by land characteristics of pH, base saturation, and exchangeable aluminum. Land quality of nutrient availability, especially of available P, much more influenced by land management. The production of maize and groundnut on the low and medium input of the land utilization types were varied and influenced by variability of those parent materials and their soil developments. The crop productions on medium input were higher and significantly differed from the low input. The advanced stage of soil development tended to decrese the land qualities and crop productions. Productivity of the wet climate of upland agriculture was strongly influenced by the land qualities of nutrient availability, nutrient retention and toxicity. The production of maize on the low input was determined by land characteristics of pH, available P, and exchangeable aluminum, and the groundnut by available P, base saturation, and exchangeable aluminum. On the medium input, the crop production of maize is influenced by the land characteristics of pH and exchaneable aluminum, and the production of groundnut by the land characteristics of BS and exchangeable aluminum. The land suitability criteria for the defined land utilization types are created on base of: (1) the relevant land qualities, and (2) crop productivity of the area. By using the criteria indicate that the land suitability classes are suitable to the area and expected yields of the defined land utilization type. In case of the study area, the land qualities and land characteristics needed in the criteria are fewer than the existing criteria and therefore the processing of the land suitability evaluation could be done faster, easily and gave an accurately results. Especially, on the very acid soils developed on the acid sedimentary rock must be applied by fertilizer, organic matter and liming to improve land qualities of the soils., Kriteria kesesuaian lahan untuk tanaman jagung dan kacang tanah yang telah ada untuk keperluan evaluasi kesesuaian lahan di Indonesia masih sangat umum dan tidak untuk spesifik lokasi. Parameter yang digunakan dan pengharkatannya belum dikaji di lapangan dan dihubungkan dengan produksi tanaman, sehingga seringkali terjadi hasil
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Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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