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 Faust. (Curculionidae : Coleoptera) pada Bunga Jantan Tanaman Kelapa Sawit (Elaeis guineensis Jacq.).
Abstrak: Elaeidobius kamerunicus is a weevil pollinator of oil palm. The weevil is host specifics on male flower of oil palm. Population of E. kamerunicus in oil palm plantation is useful to increase fruit set. Fruit set of oil palm depends on pollination. This study addressed to know population of the weevil and environmental factors that affected the weevil population on oil palm. Weevil populations were observed in male flower of oil palm by sampling method in December 2009, February, and March 2010. Relationship between environment factors and weevil population were analyzed by Pearson’s correlation with Sigmaplot software version 11.0. Results showed that population of the weevil in December 2009 was higher than that in February and March 2010. Number of spikelet per bunch was significantly affected to 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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