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Pengendalian Gulma Dengan Berbagai Kerapatan Tanaman Dan Herbisida Pada Tanaman Bawang Merah (Allium Ascalonicum L.)
Get PDFBawang merah (Allium ascolonicum L.) ialah tanaman hortikultura yang
Percobaan lapang untuk meneliti pengaruh kerapatan gulma dan pengaplikasian
herbisida pre dan post-emergence pada tanaman bawang merah. Percoban ini
dilaksanakan pada bulan Januari hingga Maret 2019 di Desa Dadaprejo, Kecamatan
Junrejo, Kota Batu, Jawa Timur.
Rancangan Acak Kelompok non faktorial dengan kombinasi JT rapat,
sedang dan renggang dengan pengendalian gulma secara manual setiap 2 minggu
sekali dan pengaplikasian herbisida pre dan post-emergence). Analisis vegetasi
dilakukan pada sebelum olah tanah, 42 HST dan 56 HST. Kombinasi perlakuan
terdiri dari 9 perlakuan dan 3 ulangan ialah P0: Jarak tanam 15 cm x 20 cm dengan
penyiangan manual , P1: Jarak tanam 15 cm x 20 cm dengan pengaplikasian
herbisida pre emergence, P2: Jarak tanam 15 cm x 20 cm dengan pengaplikasian
herbisida post emergence, P3: Jarak tanam 20 cm x 20 cm dengan penyiangan
manual , P4: Jarak tanam 20 cm x 20 cm dengan pengaplikasian herbisida pre
emergence, P5: Jarak tanam 20 cm x 20 cm dengan pengaplikasian herbisida post
emergence, P6: Jarak tanam 20 cm x 25 cm dengan penyiangan manual , P7: Jarak
tanam 20 cm x 25 cm dengan pengaplikasian herbisida pre emergence, P8: Jarak
tanam 20 cm x 25 cm dengan pengaplikasian herbisida post emergence. Data hasil
pengamatan dilakukan analisis dengan menggunakan analisis ragam (uji F) dengan
taraf nyata 5% dan dilanjutkan dengan uji Beda Nyata Terkecil (BNT) dengan taraf
5% untuk mengetahui perbedaan diantara perlakuan.
Berdasarkan hasil penelitian dapat disimpulkan bahwa terdapat pengaruh
nyata antara waktu pengaplikasian herbisida dengan kerapatan tanaman pada
peningkatan pertumbuhan dan hasil tanaman bawang merah. Makin awal
pengaplikasian herbisida akan makin baik untuk mencegah persaingan yang terjadi
antara bawang merah dan gulma. Kombinasi perlakuan yang dapat
direkomendasikan ialah kombinasi jarak tanam 20 cm x 20 cm atau 20 cm x 25 cm
dengan pengaplikasian herbisida post-emergence karena mampu menekan
pertumbuhan gulma di antara bawang merah. Kombinasi berbagai jarak tanam
dengan pengaplikasian herbisida pre-emergence juga mampu menekan
pertumbuhan gulma. Pada pengamatan gulma, terdapat pergeseran vegetasi. Gulma
yang mendominasi sebelum olah tanah ialah Commelina diffusa. Setelah ditanami
bawang merah, gulma yang mendominasi menjadi Bidens pilosa dan Cynodon
dactylon pada beberapa plot
Pengaruh Kerapatan dan Pengaplikasian Herbisida Pre dan Post Emergence pada Tanaman Bawang Merah (Allium ascalonicum L.)
Get PDFPercobaan lapang untuk meneliti pengaruh kerapatan gulma dan pengaplikasian herbisida pre dan post-emergence pada tanaman bawang merah. Percobaan ini dilakukan di Desa Dadaprejo, Kecamatan Junrejo, Kota Batu, Jawa Timur sejak  bulan Januari hingga Maret 2019. Percobaan ini dirancang dalam Rancangan Acak Kelompok non faktorial dengan kombinasi JT rapat, sedang dan renggang dengan pengendalian gulma secara manual setiap 2 minggu sekali dan pengaplikasian herbisida pre dan post-emergence). Analisis vegetasi dilakukan pada sebelum olah tanah, 42 HST dan 56 HST. Pada pengamatan 42 HST, Bidens pilosa ialah gulma yang mendominasi pada perlakuan P0 dan P6. Pada pengamatan 56 HST, gulma Commelina diffusa memiliki nilai SDR tertinggi pada perlakuan P3, P4, P6, P7 dan P8. Sedangkan pada perlakuan P0 Cynodon dactylon ialah gulma yang memiliki nilai SDR tertinggi. Pada P2 terdapat dua gulma yang memiliki nilai SDR tertinggi ialah gulma Cynodon dactylon dan Commelina diffusa. Hal ini sama seperti pernyataan Clyde et al. (2015), Umiyati (2016) dan Gomes et al. (2017). Pada perlakuan P5 gulma yang memiliki nilai SDR tertinggi ialah Cyperus iria. Pergeseran gulma terjadi karena adanya perubahan kelimpahan jenis gulma sebagai hasil dari praktik manajemen budidaya. Gulma yang rentan pada herbisida yang digunakan berulang kali akan berkurang tingkat kompetisinya. Hal ini sesuai dengan pendapat Rana et al. (2016).  Bawang merah ialah tanaman yang rentan untuk berkompetisi dengan gulma. Kehadiran gulma dapat ditekan dengan pengendalian secara manual ataupun kimiawi dan pengaturan jarak tanam. Pengaturan kerapatan tanaman dapat dilakukan untuk membatasi pertumbuhan gulma.  Maka, hasil penelitian ini ialah karena dampak perlakuan yang diujikan
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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