Preference of pollination insect Elaeidobius kamerunicus Faust. to the female inflorescence of oil palms influenced by volatile organic compounds (VOCs) emitted from the receptive flowers. VOCs, one factor of the pollination process, need more intensive research to escalate the production value of oil palm, such as fruit set. However, some cases occur in the suboptimal area where pollination is un-optimal. This research aims to study the E. kamerunicus preferences for different VOCs composition from female inflorescence on clay, sandy, and peat soil type. This study used a modified olfactometer as the test equipment. The extraction VOCs of female inflorescence on three different soil types used the maceration method and was analyzed by Gas Chromatography and Mass Spectrometry (GC-MS) instrument. The percentage of attraction E. kamerunicus preference to female inflorescence on clay, sandy, and peat soil types were 40%, 33%, and 24%. GC-MS analysis results showed that VOCs were only detected on clay soil types with a content of 1.11%, known as an attractant, namely Benzene, 1-methoxy-4 (2-Propenyl). It can affect the variation of preference of E. kamerunicus to the female inflorescence.

Pollination determines pollinating weevils in oil palm. Abiotic and biotic factors can influence population pollinator weevils. An experiment was carried out in PT. Sawit Sumbermas Sarana, Tbk. The object of research is to analyze the influence of male inflorescences, natural enemies, and climate on pollinating weevils population at clay, sandy, and peat soil types. The research method used a sampling design. Observation variables were conducted every two weeks for the availability of anthesis male inflorescences, natural enemies, and climate. Davis Vantage Pro 2 was used to measure the climate. The results showed the population of pollinator weevils was significant (p<0.05) influence on male inflorescence. The anthesis male inflorescence per ha increases as the population of pollinator weevil increases. Climate and natural enemies such as Rattus sp., Gasterachanta sp., Argiope sp., Sycanus sp., and Cosmolestes sp., have insignificant influences on pollinating weevils population. Male inflorescence was biotic factor as the source of food for pollinator weevils on clay, sandy, and peat soil types.

Secondary metabolites of oil palm have various potentials. Research on the secondary metabolite of oil palms inflorescences very limited. The purpose of this research is to compare the extraction method between maceration and steam distillation of oil palm female inflorescence’s volatile organic compounds (VOCs). The maceration used ethanolic for 5 × 24 hours, then concentrated with a rotary evaporator. Steam distillation was carried out at a temperature of >80 °C for 4 hours. The extraction results were analyzed by Gas Chromatography-Mas Spectrometry (GC-MS). VOCs found from maceration are less than steam distillation, with a 1:12 ratio. Estragole compound was found in both methods. However, steam distillation possesses more content.

Inorganic fertilizers that are applied take a certain time to be available in the soil. The application distance between types of fertilizers is needed with the aim of reducing antagonistic properties, both antagonistic properties between nutrients and between types of fertilizers so as to increase the effectiveness of fertilizer absorption. The purpose of this research study the pattern of nutrient release and the interaction of several chemical fertilizers at the oil palm nursery stage. This research was divided into 2 stages, namely the preliminary stage to determine the optimum dose of each type of fertilizer and the stage of testing the antagonism of 2 different types of fertilizers from 5 types of fertilizers, namely Urea (N), Rock Phosphate (P), MOP (K), Kieserite (K), and HGFB (B). The experimental design used a non-factorial Randomized Block Design, with 45 treatments and 4 replications. The results showed that the optimum doses of the three leaf nutrients were obtained at 40 g/seed for RP, 45 g/seed for K, and 50 g/seed for Borate. The optimum nutrients for N and K fertilizers have not been obtained, so the highest dose from the test level is used, which is 80 g/seed respectively. The results of statistical analysis show the ideal distance of application time between RP and MOP fertilizers, RP with Kieserite, RP with HGFB, MOP with Kieserite.

The protozoan parasite Plasmodium infection can cause malaria in both humans and animals. There are reports about the resistance to certain antimalarial medications. Therefore, searching for alternative medicine, such as herbal remedies, is important. This study focused on the pathophysiology of the livers of mice infected intraperitoneally with Plasmodium berghei and the efficacy of ethanol extract from breadfruit peel. Fifty male DDY mice weighing 25 and 35 grams were placed into five treatment groups. The treatment group was infected with P. berghei and administered with breadfruit peel extract at 100 mg/kg: 200 mg/kg, and 300 mg/kg, respectively, for P1, P2, and P3, P4 treated with 100 mg/kg of Doxycycline and the P5 group received no therapy. After one and two weeks, five mice from each group terminated, and then Histopathological of the liver organs were observed and scored microscopically. The results indicated that Plasmodium infection produced varied degrees of liver damage in mice. The liver’s gross pathology revealed hepatomegaly, a deeper hue than normal animal liver, and flattened edges. After two weeks of infection, histopathological examination revealed that breadfruit extract could lower the amount of Plasmodium in the liver, as indicated by decreased hemozoin, and the l iver in the healing process.