Judul: Dinamika Populasi Kumbang Elaeidobius kamerunicus (Curculionidae : Coleoptera) sebagai Penyerbuk Kelapa Sawit (Elaeis guineensis Jacq) Umur Enam Tahun.
Abstrak: Elaeidobius kamerunicus is one of the weevil pollinator of oil palm. Weevil pollinator, E. kamerunicus in plantation is useful to increase fruit set. Continuity of the oil palm pollination require minimal amount of the weevil. This study addressed to know population dynamics of the weevil and environmental factors that affected the weevil population. Weevil population was observed in male flower of oil palm plants of six years after planting. Weevil population was observed by sampling method in male flowers spikelet in May, July, and October 2009. Relationship between environment factors and weevil population was analyzed by principal component analysis (PCA). A result showed that population of the weevil was highest in October. The weevil populations related to bunch size and weevil populations found highly in the morning. Air temperature, relative humidity, and light intensity did not significantly affect to the weevil population.
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Judul: Populasi Kumbang Elaeidobius kamerunicus Sebagai Penyerbuk Kelapa Sawit (Elaeis guineensis Jacq) Umur Dua Belas Tahun
Abstrak: Weevil E. kamerunicus is the most efficient pollinator of oil palm. Pollination of E. kamerunicus replaced assisted pollination to natural pollination for increase fruit set. This study were aims to determine the population of E. kamerunicus in oil palm (E. guineensis Jacq) of 12 years after planting. Environmental factors which influence the population were studied. Observation of population of E. kamerunicus were done by sampling the weevil population in spikelet of male flower bunches in December 2009, February, and March 2010. Data population were showed in graphic, scatter plot, and analyzed based on Pearson correlation and its probability using Sigma Plot 11.0. E. kamerunicus populations was high in February 2010 and a low in March 2010. Weevil populations was high in the morning and low in the afternoon and evening. The number of spikelet per bunch affected the weevil population
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Judul: Sintesis dan Pencirian Natrium Titanat (Na2Ti2O4(OH)2) Berbahan Dasar Titanium Dioksida
Abstrak: TiO2 can be utilized as basic material for synthesis of sodium titanate (Na2Ti2O4(OH)2). This research was purposed to synthesize and characterize sodium titanate from TiO2 rutile powder as a basic material. Sodium titanate was synthesized by hydrothermal process at temperature 130 °C by mixing TiO2 rutile powder with 5 M and 10 M NaOH solution, then each was calcinated at temperature 700 °C. The energy dispersive X-ray analysis showed that sodium titanate has been successfully synthesized. This result was also supported by functional group analysis with Fourier transform infrared (FTIR) spectrofotometer showing the existence of Ti-O-Na vibration band at 989.42 cm-1. The formation of sodium titanate was depend on the reaction condition such as temperature, reaction time, and NaOH concentration. Scanning electron microscope image indicated that sodium titanate synthesized at 130 °C in 20 hours reaction time with 10 M NaOH had crystal size of 99.37 nm.
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