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PENGARUH FORMULA PEMBENAH TANAH ORGANIK GRANUL TERHADAP SIFAT KIMIA TANAH DAN PERTUMBUHAN TANAMAN PADA LAHAN KERING MASAM
Get PDFLahan kering masam perlu dikelola secara intensif untuk mengatasi kendala inheren sifat fisik dan kimia tanahnya. Penelitian pengaruh formula pembenah tanah organik granul terhadap sifat kimia tanah dan pertumbuhan tanaman pada tanah kering masam telah dilakukan di rumah kaca Balai Penelitian Tanah. Penelitian bertujuan untuk mengevaluasi efektivitas formula pembenah tanah organik granul yang telah diperkaya senyawa humat sebagai pengganti kapur untuk memperbaiki sifat kimia tanah dan pertumbuhan tanaman. Penelitian dilakukan dengan percobaan pot menggunakan rancangan acak kelompok dengan 10 perlakuan dan 3 ulangan. Perlakuannya adalah 3 jenis pembenah tanah yaitu kapur, formula pukan ayam plus dan formula pukan sapi plus, masing-masing dengan 3 level dosis. Tanaman kacang hijau digunakan sebagai indikator yang ditanam dalam pot masing-masing dengan 3 tanaman. Hasil penelitian menunjukkan bahwa pembenah tanah kapur pertanian dengan cepat meningkatkan pH tanah dan menurunkan Al- dd. Sedangkan formula pembenah tanah pukan ayam plus lebih unggul dalam peningkatan karbon organik tanah. Pembanah organik pukan ayam plus juga dapat meningkatkan pH tanah dan menurunkan kadar Al-dd, namun intensitasnya lebih rendah dari kapur. Formula pembenah tanah pukan sapi plus, kurang berpengaruh terhadap peningkatan pH dan menetralisir Al-dd. Pembenah tanah pukan ayam plus dapat meningkatkan pertumbuhan dan produksi tanaman kacang hijau. Produksi biomas kacang hijau meningkat 60% dan produksi biji meningkat 56% dibandingkan dengan perlakuan kontrol. Pertumbuhan dan produksi kacang hijau dari perlakuan pukan ayam plus lebih baik dibandingkan dengan perlakuan kapur. Dapat disimpulkan bahwa pembenah tanah pukan ayam plus dan pukan sapi plus dapat dipakai sebagai pembenah tanah pengganti kapur pada lahan kering masam
Perbandingan Pengaruh Beberapa Jenis Pupuk Mengandung Fosfat terhadap Kehilangan Hara Melalui Pelindian pada Tanah Gambut
No full textSubiksa et al, 2018. Comparison Effect of Several Phosphate Contain Fertilizers to Nutrient Loss Trough Leaching on Peat Soil . JLSO 7(1):1-13. Peat soil have specific nutrient adsorption characteristics which are affected by soil pH dependent charge. Therefore, nutrient management on such soil should be done using different approach compared to mineral soil. Research on the comparison effects of several types of phosphate containing fertilizers to nutrient loss through leaching on peat soil has been carried out in greenhouse using coulom experiments. The objectives of this study was to evaluate the rate of primary macro nutrient loss and look for fertilization technology which can reduced leaching rate. The study used a randomized block design of 14 treatments with 3 replications. The treatments were complete control treatment, partial control and 4 types of P contain fertilizer, namely SP-36, NPK compound, Chrismast Island Phosphate Rock (CIRP), and Pugam each of them with 3 levels dose. The peat soil used was ombrogenous peat with hemic maturity level taken from OKI Regency, South Sumatra. Watering is done every 2 days with 350 ml ion-free water/pot. The results showed that N and K nutrients leaching, mostly due to aplication rate of those nutrient, whereas type of fertilizer was not revealed significantly different. Meanwhile, P concentration in leachate water was significantly different among treatments. Leaching of P in the control treatment was very low because of P content of peat soil was low. The highest loss of P trough leaching rate is shown by the NPK treatment because NPK compound is belong to fast nutrient release fertilizer. CIRP and Pugam treatments showed low P loss trough leaching rates due to the slow release of P on CIRP and Pugam. The low leaching rates of CIRP and Pugam are also because of high content of Al and Fe as polyvalent cation that can promote new soil positive charges as site adsorption of P. It can be concluded that fertilization with a slow release type of phosphate fertilizer and contain sesquioxide as source of polyvalent cations such as CIRP and Pugam can reduced the rate of phosphate loss trough leaching
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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