Judul: Frekuensi Kunjungan Kumbang Penyerbuk Elaeidobius kamerunicus pada Bunga Betina Tanaman Kelapa Sawit di Perkebunan PTPN VIII Cimulang, Bogor
Abstrak: Elaeidobius kamerunicus had known as weevil pollinator which had important role in oil palm pollination. Application of the weevil can increase of oil production and fruit set. Visiting frequency of E. kamerunicus determine to pollination of palm oil. This study aimed to know visiting frequency of E. kamerunicus on oil palm’s female flowers age six years. Visiting frequency of E. kamerunicus was observed by fixed sample method in 4x10 minutes using three time blocks, which is in the morning (09.00-10.00 am), afternoon (01.00-02.00 pm), and evening (04.00-05.00 pm). Observations were conducted in 10 days on 10 different trees. Environment parameters which were temperature, humidity, wind speed, and light intensity were measured. A result showed that the highest weevil visitation frequent (130 weevils/10 minutes) to female flowers occurred in the morning. Visiting frequency in afternoon (28 weevils/10 minutes) and in evening (31 weevil/10 minutes) were lower than in the morning. The weevil’s visiting frequency related significantly to temperature and humidity.
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Judul: Visiting Frequency of Weevil Pollinator Elaeidobius kamerunicus Faust. on Oil Palm’s Female Flowers in PTPN VII Cikasungka, Bogor., Atmowidi,Tri, Kurniawan,Yana
Abstrak: Elaeidobius kamerunicus adalah kumbang polinator efektif pada tanaman kelapa sawit. Keberadaan kumbang penyerbuk kelapa sawit di perkebunan sangat diperlukan dalam meningkatkan pembentukan buah untuk menjamin kelangsungan penyerbukan pada kelapa sawit, diperlukan kumbang dengan jumlah optimum. Frekuensi kunjungan kumbang E. kamerunicus menentukan penyerbukan pada kelapa sawit. Penelitian ini bertujuan mempelajari frekuensi kunjungan kumbang E. kamerunicus pada bunga betina tanaman kelapa sawit umur tujuh tahun. Pengamatan frekuensi kunjungan kumbang dilakukan dengan fix method selama 10 menit, dengan menggunakan blok waktu, yaitu pagi (09.00-10.00), siang (13.00-14.00), dan sore (16.00-17.00). Parameter lingkungan juga di ukur selama pengamatan kumbang. Frekuensi kunjungan kumbang ke bunga betina tertinggi (121 kumbang/10 menit) terjadi pada pagi hari. Kunjungan pada siang hari (23 kumbang/10 menit) dan sore hari (17 kumbang/10 menit) lebih rendah dibandingkan pagi hari. Frekuensi kunjungan kumbang berkaitan secara signifikan dengan suhu dan kecepatan angin
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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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