1,720,968 research outputs found
Respon Klon Karet terhadap Frekuensi Penyiraman di Media Tailing Pasir Pasca Penambangan Timah
Full text linkSand tailings derived from tin post-minings activities have high porosity, low water holding capacity, and low organic matter content. These conditions causes soil water defi cit, especially in dry season. To increase the successful of sand tailings revegetation with rubber tree, it is important to select some rubber tree clones based on their adaptability on the sand tailings conditions, especially drought stress. This research aimed to study the response of several rubber tree clones to the frequency of watering on sand tailings. The experiment was conducted in a plastic house at the experimental station of Agrotechnology Study Program of Bangka Belitung University, Sungailiat for 4 months. The experimental design was a factorial randomized block design with two factors and three replications. The fi rst factor was the frequency of watering (every day, every 3 days, and every 5 days), the second factor was a combination of recommended rootstock clones and recommended latex clones (clone GT 1 + PB 260, GT 1 + IRR 118, and PB 260 + BPM 24). The results showed that watering every 5 days caused drought stress resulted in impaired growth of rubber in sand tailings media derived from tin post-mining. The combination of rootstocks and scions PB 260 + BPM 24 and PB 260 + IRR118 were categorized as moderately tolerant clones while GT 1 + PB 260 was categorized as sensitive clones to drought stress in the sand tailings media.Keywords: drought tolerance, watering frequency, rubber tree clones, sand tailing
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
Pertumbuhan Tanaman Lada (Pipper nigrum L.) Umur Satu Tahun pada Lahan Bekas Tambang dengan Penambahan Dosis Pupuk Hayati yang Berbeda
No full textBadriah B, Inonu I, Asriani E. 2019. Growth of one year old pepper (Pipper nigrum L.) in post tin mining land using different dosage biofertilizer. Jurnal Lahan Suboptimal: Journal of Suboptimal Lands. 8(2):117-125.   The yield of pepper as important spice plant has been decreased due to the reduction of pepper planting area which are converted into tin mining area. One effort can be done is utilizing suboptimal lands that has low soil fertility. The aim of this research was to determine the effect of biofertilizer dosage on one year old pepper to growth in post tin mining land. This research had been conducted from February 2018 until June 2018 in post tin mining land owned by PT Timah at Dwi Makmur Village, Bangka. The research used expremental method with Completely Randomized Block Design (CRBD) with single factor. The factor was biofertilizer dosage: (0,0; 0,5; 1,0; 5,0; 10,0; and 15,0 g/L/plant). The result showed enrichment biofertilizer significantly effect on chlorophyll content and number of branch, but not significantly on plants height, number of nodes, and leaf area. The treatment dosage 10 g/L/plant (1x108 cfu) was the best inclined result growth of one year old pepper plant in post tin mining land
Verticulture of Lettuce (Lactuca sativa L.) in the Growick Irrigation System with Various Wick Widths
No full textThe growick irrigation system is an underground irrigation that can prevent plant water loss because it directly wets the root area. The use of the width of the wick in the growick irrigation system is can meet the water needs of the growing media. The aimed of this study were to determine the effect of wick width using the growick irrigation system on the growth and yield of lettuce grown vertically. This research was conducted from April to May 2021. The research location was in the Experimental and Research Station, Faculty of Agriculture, Fisheries, and Biology, University of Bangka Belitung. The study was conducted using a randomized block design experimental method (RBD) which consisted of 5 levels of treatment. The treatment consisted of control, wick width 0.5, 1, 1.5, 2 cm. The result shows that width of the wick of the growick and verticulture irrigation systems affected the crop water consumption but had no significant effect on the growth parameters and yield of lettuce. The treatment of 0,5 cm wick width tends to be better in supporting the growth and yield of lettuce in the vertical cultivation systems
PERTUMBUHAN TANAMAN PORANG (AMORPHOPHALLUS ONCOPHYLLUS PRAIN.) DENGAN PERLAKUAN WAKTU APLIKASI PUPUK N, P, DAN K DI LAHAN TAILING PASIR BUATAN
Full text linkTanaman porang dapat tumbuh baik pada tanah bertekstur ringan yaitu lempung berpasir, berstruktur gembur dan kaya unsur hara. Dengan kondisi tersebut, tanaman porang dapat dibudidayakan pada tailing pascatambang timah. Bangka Belitung mempunyai potensi lahan bekas penambangan timah untuk ditanami tanaman porang agar dapat membantu kegiatan reklamasi lahan dengan membantu menyuburkan tanah. Penelitian ini bertujuan untuk mengetahui pengaruh serta mengetahui waktu pemberian pupuk N, P, dan K yang terbaik terhadap pertumbuhan tanaman porang pada lahan tailing pasir buatan. Penelitian ini dilaksanakan pada bulan Desember 2021 hingga Maret 2022 di Kebun Percobaan dan Penelitian Fakultas Pertanian Perikanan dan Biologi Universitas Bangka Belitung. Penelitian ini menggunakan metode eksperimen dengan menggunakan Rancangan Acak Kelompok (RAK) tunggal 1 faktor dengan taraf perlakuan W100, W550, W720, W522, W252, dan W270. Hasil penelitian menunjukkan bahwa perbedaan waktu pemberian pupuk N, P dan K tidak berpengaruh terhadap pertumbuhan tanaman porang pada lahan tailing pasir buatan. Perlakuan W522 dengan dosis 50% (1 BST), 25% (2 BST), serta 25% (3 BST) menghasilkan pertumbuhan tanaman porang yang cenderung lebih baik pada lahan tailing pasir buatan.Tanaman porang dapat tumbuh baik pada tanah bertekstur ringan yaitu lempung berpasir, berstruktur gembur dan kaya unsur hara. Dengan kondisi tersebut, tanaman porang dapat dibudidayakan pada tailing pascatambang timah. Bangka Belitung mempunyai potensi lahan bekas penambangan timah untuk ditanami tanaman porang agar dapat membantu kegiatan reklamasi lahan dengan membantu menyuburkan tanah. Penelitian ini bertujuan untuk mengetahui pengaruh serta mengetahui waktu pemberian pupuk N, P, dan K yang terbaik terhadap pertumbuhan tanaman porang pada lahan tailing pasir buatan. Penelitian ini dilaksanakan pada bulan Desember 2021 hingga Maret 2022 di Kebun Percobaan dan Penelitian Fakultas Pertanian Perikanan dan Biologi Universitas Bangka Belitung. Penelitian ini menggunakan metode eksperimen dengan menggunakan Rancangan Acak Kelompok (RAK) tunggal 1 faktor dengan taraf perlakuan W100, W550, W720, W522, W252, dan W270. Hasil penelitian menunjukkan bahwa perbedaan waktu pemberian pupuk N, P dan K tidak berpengaruh terhadap pertumbuhan tanaman porang pada lahan tailing pasir buatan. Perlakuan W522 dengan dosis 50% (1 BST), 25% (2 BST), serta 25% (3 BST) menghasilkan pertumbuhan tanaman porang yang cenderung lebih baik pada lahan tailing pasir buatan
Respon Pertumbuhan Dua Varietas Benih True Shallot Seeds Bawang Merah Terhadap Perendaman Air Hangat
Full text linkKebutuhan bawang merah di Indonesia terus mengalami peningkatan. Produksi nasional belum mampu memenuhi permintaan akibat keterbatasan lahan, ketergantungan iklim, dan teknik budidaya yang belum optimal. Inovasi penggunaan True Shallot Seed (TSS) menjadi alternatif sumber benih dengan keunggulan pertumbuhan seragam, serta pengurangan ketergantungan pada umbi. Tahap awal penggunaan TSS masih menghadapi kendala pada proses perkecambahan sehingga perlu dikaji pengaruh lama perendaman air hangat dan varietas terhadap pertumbuhan benih TSS bawang merah. Penelitian ini bertujuan untuk mengetahui pengaruh lama perendaman air hangat terhadap pertumbuhan dua varietas benih True Shallot Seeds (TSS) bawang merah, serta menentukan kombinasi perlakuan yang optimal. Rancangan acak lengkap faktorial digunakan dengan dua faktor, yaitu lama perendaman (60, 120, dan 180 menit) dan varietas (Lokananta dan Merdeka). Hasil menunjukkan bahwa lama perendaman berpengaruh nyata terhadap kadar air, keserempakan tumbuh, panjang radikula, panjang plumula, dan tinggi bibit. Varietas Merdeka memperlihatkan viabilitas dan keserempakan tumbuh lebih tinggi dibandingkan Lokananta. Kombinasi perlakuan terbaik diperoleh pada perendaman 120 menit dengan varietas Merdeka, yang menghasilkan daya tumbuh 95,56% dan keserempakan tumbuh 85,56%. Lama perendaman air hangat berpengaruh terhadap kadar air, keserempakan tumbuh, panjang radikula, dan tinggi bibit benih TSS bawang merah, dengan durasi 60–120 menit menunjukkan kondisi yang lebih sesuai dibandingkan perendaman lebih lama. Varietas berpengaruh terhadap persentase daya tumbuh benih, kadar air, keserempakan tumbuh, potensi tumbuh maksimum, panjang radikula, dan tinggi bibit benih TSS bawang merah. Varietas Lokananta berpengaruh nyata pada vigor awal, sedangkan Merdeka berpengaruh nyata pada keserempakan tumbuh dan potensi tumbuh. Interaksi antara kombinasi lama perendaman dan varietas berpengaruh terhadap persentase daya tumbuh, kadar air, potensi tumbuh maksimum, indeks vigor, laju pertumbuhan, kecepatan tumbuh, dan panjang radikula. Kombinasi perendaman 120 menit dengan varietas Merdeka memberikan respon yang paling seimbang
Pemanfaatan Kompos Bulu Ayam untuk Budidaya Selada di Lahan Tailing Pasir Bekas Penambangan Timah
No full textInonu, et.al. Use of Composted Chicken Feathers for Lettuce Cultivation in Sand Tailings of ex Tin-Mining Site. JLSO 5(2):145-152.Chicken feathers is a solid waste which can be composted for sand tailings of ex tin-mining site ameliorating. The objective of this research was to analysis the  different doses of composted chicken feathers to obtain the proper dosage for growth and production of lettuce grown on sand tailings of ex tin-mining site. This research used experimental method with Randomized Completely Block Design (RCBD). The treatment factor were doses of composted chicken feathers with five levels (5.0; 7.5; 10; 12.5; 15 tons/ha of chicken feathers) and 20 tons/ha of chicken manure as a control. The results showed  growth and production of lettuce were treated with 20 tons / ha of chicken manure is higher than all treatment of doses of composted chicken feathers. Sand tailings of ex tin-mining site which is treated 12.55 tons/ha composted chicken feathers produced the highest growth and production of lettuce
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