1,720,965 research outputs found
Nitrogen Dynamics in the Corn-Soybean Intercropping Pattern Due to Applications Residue of Corn, Soybean and Biochar
Full text linkThe aim of this research was to study the dynamic of N in the intercropping pattern of maize and soybeans given residues of maize and soybeans and their biochar. Information on the use of plant residues from crop residues and biochar as amendments and sources of organic matter in different cropping patterns against nitrogen dynamics in the field is still lacking. The experiment was arranged in a divided plot design with five residual treatments as subplots and five cropping patterns as the main plots. Measurement of the dynamics of N, pH and C-soil organic was carried out to study the interaction effect of the two treatments. The results showed that residues of corn, soybeans or those containing soybeans residues and their biochar in different intercropping patterns significantly affected levels of Nitrogen, C-organic, and soil pH, where the increase in total N levels was highest in corn and soybean residues and biochar in corn intercropping and soybean (1:2), and (2:4), and for soil organic content increase to 1.93% when the plats were 15 DAS, increased to 3,22% at 30 DAS and then decreased to 1,19% at plant age 45 DAS. Thus, giving corn and sobean residues and biochar to corn-soybean intercropping can increase the total N and C-organic soil level
The Growth of Rice Plants on Combination of Liquid Organic Fertilizer Based of the Water Hyacinth
No full textAims: This study aims to obtain a combination of liquid organic fertilizer (LOF) concentrations of palm wine and water hyacinth on the growth of rice plants.
Study Design: This research used a randomized block design with thri (3 replications).
Place and Duration of Study: This research was conducted in Baolan District, Tolitoli Regency, Central Sulawesi Province with an altitude of 20 meters above sea level (MSL) from September 2022 to January 2023.
Methodology: consisting of six treatments, namely Ao = control, A1 = 80 ml LOF of water hyacinth + 20 ml LOF of palm wine + 900 ml of water, A2 = 70 ml LOF of water hyacinth + 30 ml palm wine + 900 ml water, A3 = 50 ml water hyacinth + 50 ml palm wine + 900 ml water, A4 = 40 ml water hyacinth +60 ml palm wine + 900 ml water, A 5 = 30 ml water hyacinth + 70 ml of palm wine + 900 ml of water. Each treatment was applied to the pot as media and each pot was planted with 1 seed.
Results: The results of the study was shown that the combination of water hyacinth and palm wine had a significant effect on plant height, number of tillers, panicle length and grain weight per panicle.
Conclusion: Application of liquid organic fertilizer with a combination of water hyacinth and palm wine can increase rice plant growth, increase the number of tillers, panicle length and seed weight per panicle
The Use of Rice Husk Biochar and Flooding System on Rice Production in Central of Sulawesi Indonesia
Full text linkThe population growth rate is not in line with the rate of increase in food production, especially rice which is the staple food of 90% of the Indonesian people, to maintain food security in various government programs including PAJALE (Rice, corn and soybeans), through increased production through intensification or extensification. To increase land productivity, soil health must be improved using soil enhancers such as biochar. The source of biochar can come from plant residues such as rice husk. biochar can improve the physical, chemical and biological properties of the soil. Besides that, water management in the rice cultivation system is very important especially in certain phases of rice growth. This study aims to examine the use of Biochar doses and flooding systems on the efficiency of fertilizing and productivity of lowland rice plants. This study used a randomized block design, with a factorial pattern. The first factor consisted of 6 levels of treatment of biochar doses, 0, 1, 2, 3, 4, and 5 tons ha-1. And the second factor consists of 2 levels, namely, (p1) continuous water flooding and (p2) intermittent water flooding, observed response parameters, plant height, concentration leaf, N,P, K, number of tillers, number of productive tillers, weight 1000 grain, and ton ha-1 production. The results showed that the setting of flooding and biohcar use had a positive effect in increasing the number of productive tillers at an average of 21 tillers, rice production by 22.31% from 4.44 tons ha-1 to 6.99 tons ha-1 harvested dry grain (HDG) 14% moisture content in the use of a dose of 3 tons ha-1 Biochar rice husk. Water flooding do not affect statistical production
Penggunaan biochar sebagai solusi alternatif pengurangan pupuk anorganik pada budidaya Padi (Oryza sativa L.)
Full text linkPengurangan ketergantungan pada pupuk anorganik terus diupayakan untuk meminimalkan dampak negatif lingkungan dan biaya produksi usahatani padi yang tinggi. Penelitian ini bertujuan untuk mengkaji pengaruh penggunaan biochar yang dikombinasikan dengan pupuk anorganik persentase penggunaan menurun, terhadap pertumbuhan dan hasil tanaman padi. Penelitian ini dilaksanakan di Kelurahan Tuweley, Tolitoli, Sulawesi Tengah, pada ketinggian 24 m dpl, berlangsung bulan Maret hingga September tahun 2023 penelitian ini menggunakan biochar dosis 10 t ha⁻¹ yang dikombinasikan dengan pupuk urea, SP-36, dan KCL. Dosis yang digunakan merujuk pada rekomendasi pemupukan padi sawah Desa Awung, Kecamatan Galang, Kabupaten Tolitoli, yaitu Urea 250 kg ha⁻¹, SP-36 150 kg ha⁻¹, dan KCL 100 kg ha⁻¹. Penelitian ini menggunakan rancangan acak lengkap 6 taraf perlakuan, yang masing-masing diberi tanda: A0 = perlakuan tanpa biochar dan pupuk anorganik, A1 = penggunaan pupuk anorganik 100% tanpa biochar, A2 = biochar + 25% pupuk anorganik, A3 = biochar + 50% pupuk anorganik, A4 = biochar + 75% pupuk anorganik, A5 = biochar + 100% pupuk anorganik. Setiap perlakuan diulang 3 kali, dan masing-masing unit percobaan terdiri dari 5 tanaman. Hasil penelitian menunjukkan bahwa penggunaan biochar yang dikombinasikan dengan 50% pupuk anorganik dosis anjuran spesifik lokasi tidak menurunkan pertumbuhan dan hasil tanaman padi secara signifikan berdasarkan analisis ragam dan uji BNJ 5%. Hal tersebut menunjukkan bahwa aplikasi biochar dapat menurunkan penggunaan pupuk anorganik hingga 50% dari dosis anjuran spesifik lokasi.
ABSTRACT
Efforts to reduce dependence on inorganic fertilizers continue to be pursued to minimize negative environmental impacts and the high production costs of rice farming. This study aims to examine the effect of biochar application combined with various doses of inorganic fertilizers on the growth and yield of rice. The research was conducted in Tuweley Village, Tolitoli, Central Sulawesi, at an altitude of 24 meters above sea level (m a.s.l.), during March to September 2023. This study used a biochar dose of 10 t ha−1 combined with urea, SP−36, and KCl fertilizers. The doses used referred to the recommended fertilization for lowland rice in Awung Village, Galang District, Tolitoli Regency, namely Urea 250 kg ha−1, SP−36 150 kg ha−1, and KCl 100 kg ha−1. The study employed a Completely Randomized Design with 6 treatment levels, each labeled as: A0=control treatment (without biochar and inorganic fertilizer) A1=100% inorganic fertilizer without biochar A2=biochar+25% inorganic fertilizer A3=biochar+50% inorganic fertilizer A4=biochar+75% inorganic fertilizer A5=biochar+100% inorganic fertilizer. Each treatment was replicated 3 times, and each experimental unit consisted of 5 plants. The results showed that the use of biochar combined with 50% of the location specific recommended dose of inorganic fertilizer did not significantly reduce growth and yield of rice based on the analysis of variance (ANOVA) and the 5% Honestly Significant Difference (HSD) test. Therefore, the application of biochar can reduce inorganic fertilizer use by up to 50% of the location specific recommended dose
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
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