1,720,964 research outputs found
Peran Insektisida Botani Ekstrak Biji Mimba untuk Konservasi Musuh Alami dalam Pengelolaan Serangga Hama Kapas.
Get PDFNatural Enemies Conservation: The Role of Neem-seed Extracts for Natural Enemies Conservation Used of Cotton Insect Pest Control. Insects associated with cotton plant are numerous, as the plant bears extrafloral nectar. More than 90 species of natural enemies are reported and identified. They could manage the cotton pest, keeping the pest population is under action threshold level when their presence is considered in scouting and action threshold concept. However, most of cotton farmers are insecticide-spray-minded people who think that insecticide sprays is a must in cotton cultivation. This behavior is unfavorable for the natural enemies in building their population so they can act as an effective mortality factor for the pest. Neem seed extract (NSE) is toxic to herbivores but relatively safe for natural enemies, so that it could be used as a substitute for synthetic chemical insecticides. Therefore, NSE is recommended to be used for conserving natural enemies in cotton agro ecosystem. KEY WORDS: neem seed extract, Gossypium hirsutum, conservation
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Pengaruh Penambahan Biomassa di Lahan Kering terhadap Diversitas Arthropoda Tanah dan Produktivitas Tebu
Get PDFProgram pengembangan tebu saat ini diarahkan ke lahan kering yang memiliki ketersediaan air dan kesuburan tanah terbatas. Kondisi lahan kering dapa menjadi pembatas produktvitas tebu. Penambahan biomassa ke lahan dapat meningkatkan kesuburan dan populasi arthropoda tanah/detrivora. Penelitian penambahan biomassa Crotalaria juncea pada lahan kering dilaksanakan di Kebun Percobaan Asembagus, Situbondo mulai bulan Januari–Juli 2015. Tujuan penelitian adalah untuk menganalisa pengaruh penambahan biomassa pada lahan kering terhadap diversitas arthropoda tanah dan pengaruhnya terhadap produksi tebu. Perlakuan terdiri atas lahan dengan penambahan biomassa (serasah tebu dan pupuk hijau C. juncea) dan lahan yang tanpa penambahan biomassa. Pengamatan kelimpahan arthropoda tanah dan tingkat diversitas dilakukan dengan pemasangan pitfall traps dan yellow pan traps. Hasil penelitian menunjukkan bahwa Collembola dan Hymenoptera merupakan arthropoda tanah yang dominan. Indeks diversitas arhropoda tanah pada lahan dengan penambahan biomassa lebih tinggi (0,82–0,84) dibandingkan pada lahan tanpa penambahan biomassa (0,75–0,79). Penambahan biomassa pada tahun pertama dapat meningkatkan kandungan C Organik tanah dari 0,76 menjadi 1,06, dan meningkatkan kandungan N dari 0,03 menjadi 0,11, serta meningkatkan produksi tebu dari 70,4 ton/ha menjadi 101,4 ton/ha. Untuk memperbaiki kondisi ekosistem lahan kering diperlukan penambahan biomassa secara terus menerus.Effect of Biomass Addition in Dry Land to Diversity of Soil Arthropods and Productivity of SugarcaneThe current sugarcane development program is directed to dry lands that have limited water availability and soil fertility, thereby limiting the productivity of sugarcane. In order to restore soil fertility and reduce the evaporation of groundwater, addition of biomass in the form of trash (dried leaves) of sugarcane as well as the addition of green manure (Clotalaria juncea) is needed. Biomass addition to the land could increase soil fertility and the population of soil arthropods/detrivores. The experiment was conducted on dry land at Asembagus Experimental Station, Situbondo from January 2015–July 2015. The purpose of this research was to analyze the effect of biomass addition to the diversity of soil arthropods and sugarcane productivity. Treatments consisted of land with the addition of biomass (sugarcane/sugarcane and green manure C. juncea) and control. Observation of the abundance of soil arthropods and diversity level was done by setting pitfall traps and yellow pan traps, observation was done monthly. The results showed that the order of Collembola and Hymenoptera were dominant arthropods. The diversity index of ground arhropods on the land with biomass increments was higher (0.82–0.84) than that in the land without biomass addition (0.75–0.79). The addition of biomass in the first year succeeded in increasing the organic C content of soil from 0.62 to 1.06 and increasing the production of sugar cane from 70.4 tons/ha to 101.4 tons/ha. In order to improve the ecosystems condition, it is required the addition of biomass continuously.Program pengembangan tebu saat ini diarahkan ke lahan kering yang memiliki ketersediaan air dan kesuburan tanah yang terbatas, sehingga menjadi pembatas produktvitas tebu. Penambahan biomassa ke lahan dapat meningkatkan kesuburan dan populasi arthropoda tanah/detrivora. Penelitian penambahan biomassa Crotalaria juncea pada lahan tebu dilaksanakan di Kebun Percobaan Asembagus, Situbondo mulai bulan Januari - Juli 2015. Tujuan penelitian adalah untuk menganalisa pengaruh penambahan biomassa terhadap diversitas arthropoda tanah dan pengaruhnya terhadap produksi tebu. Perlakuan terdiri atas lahan dengan penambahan biomassa (serasah tebu dan pupuk hijau C. juncea) dan lahan yang tanpa penambahan biomassa. Pengamatan kelimpahan arthropoda tanah dan tingkat diversitas dilakukan dengan pemasangan pitfall traps dan yellow pan traps, Hasil penelitian menunjukkan bahwa Collembola dan Hymenoptera merupakan arthropoda tanah yang dominan. Indeks diversitas arhropoda tanah pada lahan dengan penambahan biomassa lebih tinggi (0,82–0,84) dibandingkan pada lahan tanpa penambahan biomassa (0,75–0,79). Untuk memperbaiki kondisi ekosistem diperlukan penambahan biomassa secara terus menerus. Penambahan biomassa pada tahun pertama berhasil meningkatkan kandungan C Organik tanah dari 0,76 menjadi 1,06, dan meningkatkan kandungan N dari 0,03 menjadi 0,11, serta meningkatkan produksi tebu dari 70,4 ton/ha menjadi 101,4 ton/ha. Effect of Biomass Addition in Dry Land to Diversity of Soil Arthropods and Productivity of Sugarcane ABSTRACT The current sugarcane development program is directed to dry lands that have limited water availability and soil fertility, thereby limiting the productivity of sugarcane. In order to restore soil fertility and reduce the evaporation of groundwater, the addition of biomass in the form of trash (dried leaves) of sugarcane as well as the addition of green manure (Clotalaria juncea). Biomass addition to the land could increase soil fertility and the population of soil arthropods/detrivores. The experiment was conducted at Asembagus Experimental Station, Situbondo from January 2015–July 2015. The purpose of this research was to analyze the effect of biomass addition to the diversity of soil arthropods and sugarcane productivity. Treatments consisted of land with the addition of biomass (sugarcane/sugarcane and green manure C. juncea) and control. Observation of the abundance of soil arthropods and diversity level was done by setting pitfall traps and yellow pan traps, observation was done monthly. The results showed that the order of Collembola and Hymenoptera were dominant arthropods. The diversity index of ground arhropods on the land with biomass increments was higher (0.82–0.84) than that in the land without biomass addition (0.75–0.79). In order to improve the ecosystems condition, it is required the addition of biomass continuously. The addition of biomass in the first year succeeded in increasing the organic C content of soil from 0.62 to 1.06 and increasing the production of sugar cane from 70.4 tons/ha to 101.4 tons/ha
Dinamika Populasi Kompleks Parasitoid Telur Helicoverpa armigera (Hubner) Pada Ekosistem Kapas Monokultur dan Kapas Tumpangsari dengan Jagung
No full textEggs of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) on its host plants could beparasitized by some species of parasitoids, especially of the genus Trichogrammatoidea andTrichogramma. This research was aimed to study the population dynamics of egg parasitoids of H.armigera on unsprayed fields of cotton monoculture and intercropped with maize. The plot size ofeach field was 19 m x 20 m, with five replicates. We collected H. armigera eggs from both fieldsperiodically since 23 days after planting (dap) to 100 dap. The eggs were collected on 9 sample units(size of sample unit: 1 m2) in 7-days interval. The number of collected and parasitized eggs wasrecorded and the emerged parasitoids were identified to species level. The result showed that thefluctuation pattern of H. armigera egg population was not different on cotton monoculture and cottonintercropped with maize. The parasitoid population was relatively high during the flowering phase ofcotton and maize. The parasitoids of H. armigera eggs found in cotton monoculture and cottonintercropped with maize were T’toidea armigera, T’toidea guamensis, T’toidea bactrae bactrae,T’toidea bactrae fumata, T. chilonis and T. chilotraeae . The dominant species on early season untilthe flowering phase of the plants was T’toidea armigera, while on the latter phase of the plantphenology was T. chilotraeae. Implication of this population dynamics and the succession of theparasitoids in biological control are discussed
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