1,720,959 research outputs found
Effectivity of Manure at Various Dose Added Agrobost to The Growth of Mango Seedlings
Full text linkOne of the efforts to increase mango production in Southeast Sulawesi is to produce high quality and high quantity mango seeds. Manure contains macro and micro nutrients that are important for plant growth and development as well as play a role in maintaining nutrient balance in the soil to improve soil properties. The aim of this study was to obtain the best manure doses applied with agrobost in improving the growth of Arumanis mango seedlings. This research was conducted in Kemaraya Sub-District of West Kendari District, Kendari City. The study design used was a randomized block design (RBD) with 6 treatments, namely: control (T0), 100 g (T1); 150 g (T2); 200 g (T3); 250 g (T4); and 300 g (T5) of manure per polybag. Each treatment was added with agrobost of 17 ml/polybag and replicated 5 times. The variables observed were plant height, stem diameter; number of leaves, and leaf area, at ages 1, 2, and 3 months after planting. The results showed that the manure added agrobost influenced the growth of Arumanis mango seedlings. The manure treatment with a dose of 150 g per polybag (T2) was the best treatment in improving the growth of Arumanis mangoes at 1, 2 and 3 months after planting. This was indicated by the plant height of 28,40; 30,94; and 32,82 cm, stem diameter of 0,44; 0,70; and 0,99 cm; and number of leaves 6,60; 7,20 and 9,00 strands were significantly higher compared to other treatments during the stud
Effectiveness of Local Indigenous Rhizobacterial Isolates in Enhancing Resistance of Shallot (Allium cepa L.) to Fusarium oxysporum
Full text linkFusarium wilt caused by Fusarium oxysporum remains a major limitation in shallot (Allium cepa L.) cultivation, severely reducing yield and crop quality. This study aimed to evaluate the effectiveness of native rhizobacterial isolates as biological inducers of resistance against Fusarium wilt under different organic growing media. A split-plot randomized complete block design was applied using three growing media (rice husk charcoal, manure, and their combination) and four rhizobacterial treatments (control and three local isolates: R1–R3) with three replications. Key physiological assays included the measurement of salicylic acid (SA) content and peroxidase (POX) enzyme activity as biochemical indicators of induced resistance. Results showed that the isolate from Waitii Village (R3) significantly reduced disease incidence to 52.67% compared with 86.56% in the control, while the combined organic medium (M2) further enhanced plant resistance. Increased SA (26.82 ppm) and POX activity exhibited strong negative correlations with disease incidence (R² = 0.60 and R² = 0.71, respectively), indicating their pivotal role in rhizobacteria-mediated defense activation. These findings confirm that indigenous rhizobacteria, when combined with organic amendments, effectively stimulate systemic acquired resistance and mitigate the severity of Fusarium wilt in shallots. The study highlights the potential of the R3 isolate as a sustainable bioinoculant candidate for integrated disease management. Further molecular identification, in vitro antagonism testing, and multi-location field validation are recommended to ensure its stability, efficacy, and applicability under diverse agroecological conditions
Mechanism of Toxicity and Tolerance in Plants Against Aluminum Stress
No full textAluminum (Al 3+) is rhizotoxic ions in the soil (mineral) acid. Al activities increases with increasing soil acidity, below pH 5.5 the solubility of Al 3+ cations will increase. High level of soluble can cause interference with metabolic processes and plant physiology. Cumulatively, the physiology of metabolic disorders and initially looked at the root system. The tip of the root and lateral roots become thickened and hair and roots become lower, causing a decrease in root length and root tissue enlargement thus inhibiting the growth of roots, the absorption of nutrients and water, will further lower the growth, production and productivity of crops. Although Al disrupt metabolism and suppress the growth of the plant, until a certain threshold of adverse effects in Al still be tolerated, depending on the type of plant and the level of activity of Al. Tolerance of crops to Al can be expressed through two mechanisms, namely: external tolerance mechanism and internal tolerance mechanism. The main difference between the two mechanisms is in the area of detoxification Al whether in symplast (internal) or apoplast (exclusion). The ability of plants to be able to adapt to drought stress Al, depends on the ability of plants to produce organic acid in an amount sufficient for eliminating the toxic influence of stress Al. Root exudates of plants capable of producing such an organic acid that plays an important role in adaptation strategies. The high production of organic acids is associated with the formation of specific enzymes, as a response to stress Al. Allegedly the sensitive strain, the synthesis of organic acids is not adequate to chelate A
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
Uji Kualitas Pupuk Organik Cair (POC) berbahan Dasar Jeroan Ayam Menggunakan Mikroorganisme Lokal (MOL) dari Limbah Buah sebagai Dekomposer
Full text linkPenelitian ini bertujuan untuk mengamati perubahan warna, aroma, pH, dan suhu selama proses fermentasi dalam pembuatan pupuk organik cair (POC) berbahan dasar jeroan ayam dengan bantuan mikroorganisme lokal (MOL) sebagai dekomposer. Bahan yang digunakan pada penelitian ini yaitu jeroan ayam segar (usus ayam) sebagai bahan dasar POC, larutan MOL yang dibuat dari fermentasi bahan organik menggunakan limbah buah nanas (kulit nanas) dan limbah pisang (kulit pisang yang masak). Parameter yang diamati yaitu Perubahan warna, aroma, pH, dan suhu dari hasil akhir pembuatan POC. Hasil penelitian ini yaitu pH awal larutan fermentasi POC berada pada angka 6,5. pH mengalami penurunan secara bertahap selama fermentasi, mencapai pH 5,0 pada hari ke-21. Perubahan warna selama proses fermentasi POC dari merah kecoklatan (hari ke-0) menjadi hitam pekat pada hari ke-15 hingga akhir fermentasi. Aroma awal menunjukkan bau amis yang kuat hingga hari ke-21, bau asam mulai menurun. Suhu larutan cenderung meningkat di awal fermentasi hingga mencapai puncaknya pada 33,45 °C pada hari ke-9. Pada hari ke-21, suhu menurun dan stabil 28,25 °C. Kesimpulan hasil penelitian ini menunjukkan bahwa POC berbahan dasar jeroan ayam yang difermentasi menggunakan MOL dari limbah buah mencapai kondisi optimal setelah 21 hari fermentasi, dengan perubahan warna, aroma, pH, dan suhu yang menunjukkan proses dekomposisi yang baik dan fermentasi yang stabil
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
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