1,720,975 research outputs found
PENGAMATAN FENOLOGI PADA DELAPAN VARIETAS KELAPA SAWIT (Elaeis guineensis Jacq.) MENGGUNAKAN KONSEP THERMAL UNIT
Full text linkPlant growth and development depends on environmental conditions (including air temperature). Effect of environmental conditions on plant development and growth is known as phenology. The general concept used to determine the effect of temperature on plant development and growth quantitatively is thermal units. This study was conducted to observe the phenology of eight oil palm varieties released by the Indonesian Palm Oil Research Institute (IOPRI) based on the thermal units concept. This study also explained the implications of the phenology characteristics from each variety in the selection of agro-climate-specific oil palm varieties. The research was conducted at the demonstration plot of Adolina Seed Garden PT. Perkebunan Nusantara IV, Serdang Bedagai Regency, North Sumatra with an altitude of 10 m asl during September 11th, 2014 until June 30th, 2018. The results showed that the appearance of the first leaf until bunch was ripened and harvested from DxP Avros, DyP Dumpy, DxP LaMe, DxP Langkat, DxP PPKS 540, DxP PPKS 718, DxP Simalungun and DxP Yangambi require thermal units (oC days) and duration (days) respectively 5.785 and 457; 5,756 and 454; 6,050 and 476; 5,903 and 467; 5,775 and 452; 6.164 and 484; 6,105 and 478; and 6,084 and 479. DxP PPKS 540 tends to be more suitable for areas with low daily average temperature conditions (18-23oC). In areas with an average temperature of 24-32oC, all oil palm varieties released by IOPRI will grow optimally. Meanwhile, for areas with an average temperature varies between 30-32oC, varieties should be chosen is varieties which potentially produce more bunch such as DxP Avros, DxP LaMe, DxP Langkat, DxP PPKS 540, DxP Simalungun or DxP Yangambi.Pertumbuhan dan perkembangan tanaman bergantung pada pengaruh kondisi lingkungan (termasuk di dalamnya suhu udara). Pengaruh kondisi lingkungan terhadap periode fase-fase perkembangan tanaman dikenal dengan istilah fenologi. Konsep umum yang digunakan untuk mengetahui pengaruh suhu terhadap kondisi fenologi secara kuantitatif adalah thermal units. Penelitian ini bertujuan untuk mengamati karakter fenologi perkembangan tandan buah segar pada delapan varietas yang dirilis Pusat Penelitian Kelapa Sawit (PPKS) berdasarkan konsep thermal units. Penelitian ini juga membahas implikasi dari karakteristik masing-masing varietas terhadap pemilihan varietas kelapa sawit spesifik lokasi agroklimat. Penelitian dilakukan di Demonstrasi Plot (Demplot) Varietas Kebun Benih Adolina PT Perkebunan Nusantara IV, Kabupaten Serdang Bedagai, Sumatera Utara dengan ketinggian 10 mdpl pada 11 September 2014 – 30 Juni 2018. Hasil penelitian menunjukkan bahwa kemunculan daun pertama hingga tandan siap dipanen pada varietas DxP Avros, DyP Dumpy, DxP LaMe, DxP Langkat, DxP PPKS 540, DxP PPKS 718, DxP Simalungun serta DxP Yangambi memerlukan jumlah thermal units (oC hari) dan durasi (hari) berturut-turut adalah 5.785 dan 457; 5.756 dan 454; 6.050 dan 476; 5.903 dan 467; 5.775 dan 452; 6.164 dan 484; 6.105 dan 478; serta 6.084 dan 479. Varietas DxP PPKS 540 cenderung lebih sesuai untuk digunakan pada wilayah dengan kondisi suhu rata-rata harian yang rendah (18-23oC). Pada wilayah dengan suhu rata-rata 24-32oC, semua varietas kelapa sawit yang dirilis PPKS akan dapat tumbuh dengan optimal. Sementara itu, khusus untuk wilayah dengan suhu rata-rata 30-32oC, sebaiknya dipilih varietas yang memiliki potensi jumlah tandan yang lebih banyak seperti DxP Avros, DxP LaMe, DxP Langkat, DxP PPKS 540, DxP Simalungun dan DxP Yangambi
Kuantifikasi Kontribusi Faktor Iklim Terhadap Variasi Produktivitas Tanaman Kelapa Sawit
Full text linkThe yield of oil palm is heavily influenced by various climatic conditions, including rainfall (RF), radiation (Qs), temperature, and humidity. To quantify the impact of these factors, a study was conducted on a 15-year-old palm located in an oil palm estate in Pangkalan Lima Puluh Kota, West Sumatra, Indonesia. The study used climate data from 2011-2019 and yield data from 2015 and 2019. To determine the contribution of RF, Qs, and VPD / vapour pressure deficit, which was estimated from temperature and humidity, a computer-intensive importance metric developed by Lindemann, Merenda, and Gold (LMG metric) was utilized. The results showed that RF, Qs, and VPD collectively accounted for 50.16% of yield fluctuations at the study site. Furthermore, the contribution of climate factors on yield followed the order of VPD > Qs > RF.Produktivitas tanaman kelapa sawit sangat dipengaruhi oleh beberapa kondisi iklim, termasuk curah hujan (RF), radiasi (Qs), suhu, dan kelembaban udara. Untuk mengkuantifikasikan pengaruh faktor-faktor produksi tersebut, sebuah kajian telah dilakukan pada tanaman umur 15 tahun di sebuah perkebunan kelapa sawit di Pangkalan Lima Puluh Kota, Sumatera Barat, Indonesia. Kajian ini menggunakan data iklim kurun waktu 2011-2019 dan data produktivitas dari tahun 2015-2019. Untuk mengetahui kontribusi dari RF, Qs, dan vapour pressure deficit / VPD, yang diestimasikan dari data suhu udara dan kelembaban udara, telah digunakan Metode LMG metric yang dikembangkan oleh Lindemann, Merenda, and Gold. Hasil kajian menunjukkan bahwa RF, Qs, dan VPD secara bersamaan mempengaruhi 50,16% fluktuasi produktivitas di lokasi kajian. Lebih lanjut, kontribusi faktor iklim terhadap produktivitas tanaman kelapa sawit mengikuti urutan sebagai berikut VPD > Qs > RF
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
Agronomy explains large yield gaps in smallholder oil palm fields
Full text linkThe role of agronomic management for explaining yield gaps in smallholder oil palm fields has received little attention.• We assessed yield gaps in smallholder oil palm fields using a crop model, survey data, and field measurements.• Average farmer yield was low, representing 42% of the attainable yield as determined by local weather and soil.• Among management practices, nutrients, harvest interval, weeds control, and pruning have largest influence on yield gaps.• Improving agronomic management can increase smallholders oil palm yield and profit on existing plantation area.Fil: Monzon, Juan Pablo. University of Nebraska; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; ArgentinaFil: Lim, Ya Li. University of Nebraska; Estados UnidosFil: Tenorio, Fatima A.. University of Nebraska; Estados UnidosFil: Farrasati, Rana. Indonesian Oil Palm Research Institute; IndonesiaFil: Pradiko, Iput. Indonesian Oil Palm Research Institute; IndonesiaFil: Sugianto, Hendra. University of Nebraska; Estados UnidosFil: Donough, Christopher R.. University of Nebraska; Estados UnidosFil: Rattalino Edreira, Juan Ignacio. University of Nebraska; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Rahutomo, Suroso. Indonesian Oil Palm Research Institute; IndonesiaFil: Agus, Fahmuddin. Research Center for Horticultural and Estate Crops; IndonesiaFil: Slingerland, Maja A.. University of Agriculture Wageningen; Países BajosFil: Zijlstra, Mink. University of Agriculture Wageningen; Países BajosFil: Saleh, Shofia. World Resources Institute-Indonesia; IndonesiaFil: Nashr, Fakhrizal. No especifíca;Fil: Nurdwiansyah, Denni. No especifíca;Fil: Ulfaria, Nadib. No especifíca;Fil: Winarni, Nurul L.. Universitas Indonesia; IndonesiaFil: Zulhakim, Nurbaya. No especifíca;Fil: Grassini, Patricio. University of Nebraska; Estados Unido
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