Judul: Pengaruh Pemberian Pupuk Organik pada Produksi dan Serapan Hara Jagung Manis (Zea mays) di Latosol, Darmaga
Abstrak: There are two form of organic fertilizers, solid and liquid. Solid organic fertilizer is usually applied to the soil. The advantage in application of organic fertilizers able to adsorb nutrients that easily lost and supply availability of nutrients and therefore can increase efficiency of fertilizer. The purpose of this study was to study the effect of organic fertilizer application on Latosol, Darmaga to production and nutrient uptake of corn as plant indicator. The experiment was conducted in the greenhouse by using completely randomized design consisting of seven treatments and each treatment was repeated four times so that there were 28 pot experiments. Seven treatments were consisted of control, standard, 75% PO + 50% S, 75% PO + 75% S; 100% PO + 50% S; 100% PO + 75% S, and 125% PO + 50% S. The parameters measured were plant height, weight of shoot, root weight, ear weight with and without cornhusk, uptake of N, P, and K nutrients in shoot and plant roots and the Corganic content, N-total, and CEC (cation exchange capacity) soil after the experiment. The result of experiment showed that the application of organic and anorganic (standard) fertilizer on plant height and weight of shoot was not significantly different than standard fertilizer (100% S). The weight of plant roots and nutrient uptake of N, P, and K of the shoot and plant roots in the treatment of 100% PO + 75% S was significantly higher than other treatments. Treatment combination of organic and anorganic (standard) fertilizer at the lower doses of standard recommendation significantly increased ear weight with and without cornhusk. Dosage recommendations based on the RAE value are the treatment of 100%PO + 50%S (158,66%) and 75%PO + 50%S (142,52%). The analysis of soil after the experiment showed that the use of organic fertilizer combined with anorganic fertilizer (standard) produced levels of C-organic, N-total, and the CEC soils tend to be higher than the standard (100% S) and control treatments. The use of organic fertilizer combined with anorganic (standard) fertilizer at lower doses (50% S and 75% S) increased effectiveness of fertilizer to increase the growth and production of corn.
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Judul: Efektivitas Pupuk Organik Granul terhadap Pertumbuhan, Produksi dan Kadar Hara NPK Daun Jagung Manis pada Latosol Dramaga
Abstrak: Latosol fertility is generally low due to low nutrient availability and organic matter content, so addition of anorganic fertilizer only will not provide optimal production of plants. Therefore, additional of organic fertilizer must be done. The objective of this research is to study the effectiveness of granulated organic fertilizer which was combined with standard fertilizer on the growth, production, and NPK contents of sweat corn leaves in Latosol Dramaga. The field experiment was conducted in the University Farm IPB, from Februari to August 2012. The nutrient content was analyzed in the Laboratory of Soil chemistry and Fertility, Faculty of Agriculture, IPB. The design of research was completely randomized block design with single factor, that was combination of anorganic fertilizer (standard) with organic fertilizer, which consisted of 7 treatments: control, standard, 50% standard + 100% organic (0,5S+1PO), 50% standard + 150% organic (0,5S+1,5PO), 75% standard + 100% organic (0,75S+1PO), 75% standard + 150% organic (0,75S+1,5PO), and 100% standard + 100% organic (1S+1PO). The result of the research showed that the granulated organic fertilizer increased of growth, production of corn, and nutrient content of corn leaves effectively. The two treatment combinations (1S+1PO) and (0,75S+1PO) showed the best performance, which was indicated by the weight of corn with huskcover and value of RAE i.e. 15,58 t/ha and 162,07% (1S+1PO), and 13,97 t/ha and 128% (0,75S+1PO), respectively. The effect of both treatment combinations above were higher than standard treatment (12,58 t/ha and 100%).
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Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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