1,720,962 research outputs found
Soil Physical Properties and Oil Palm Plant (Elaeis guineensis Jacq.) Growth Applied with Solid Waste of Palm Oil Mill
Get PDFThe growth of oil palm plants, such as height, additional fronds, and stem diameter, depends on the soil condition and its physical properties. Good soil physical properties will support the growth of oil palm plants. On marginal lands such as ex-mining land and sub-soil soil that has poor soil physical properties, improvements must be made. Thus, palm oil cultivation on ex-mining land or subsoil land can grow well. This research aims to study solid application to various soil conditions to improve the growth and physical properties of oil palm plants. The land applied by solid is an ex-mining land subsoil land. Meanwhile, the land with flat topography has not been degraded as a control. The data analysis carried out is an orthogonal contrast test, between control with solid application and without solid application, between solid application with without solid, between among solid application (ex-mining and subsoil land), between among without solid application (ex-mining and subsoil land). The research result shows that soil physical properties and plant growth applied with solid are better than without solid, lower bulk density value, higher total pore space and water holding capacity, taller plant growth, higher palm branches quantity, larger stem diameter. Solid application in ex-mining is lower than solid application on sub-soil, with lower water holding capacity value and lesser palm fronds addition. Without solid application on ex-mining sites, the results are worse than no solid application on sub-soil, with lower water holding capacity and lower plant height. Control is better than solid and without solid applications, higher plants, higher addition of frond quantity, and larger stem diameter
Macrofaune Restoration In Peat One Year After Burning
No full textMacrofauna data on post-fire peat soils have been documented in many literatures, but assessments of soil macrofauna recovery in peatlands after one and a half years after fires are scarce. The aim of this study was to evaluate the recovery of soil macrofauna in peatlands after one and a half years after fires. This research was conducted on peat land in PT.SSS Kuala Panduk Teluk Meranti District, Pelalawan Regency. This research was conducted by survey method. Determination of the location using the purposive sampling method, especially on peatlands after one and a half years after the fire and unburned peatlands. Based on peatland cover, 6 samples were taken, and 6 samples were taken from unburned peatland. Determination of the sampling point using a systematic method. Macrofauna observations included number of families, number of individuals, population density, and diversity index. The study of macrofauna recovery was carried out by t-test on macrofauna data on peatland fires and unburned peatlands. The results shown in peatlands after a year and a half of fires are macrofauna recovery
The Nitrogen Learing In Applicated Peatlands Low Slow Npk Fertilizers And Fertilizers And Their Effect On Growing Of Sweet Maize (Zea Mays Sacchararata Sturt)
No full textUtilization of peat as agricultural land faced the problem of low soil fertility. Low soil fertility made nitrogen being leached easily. One solution to overcome Nitrogen leaching and efficiency fertilizer raising used dolomite and slow decompose fertilizers. This study aims to determine the effect of dolomite on Nitrogen element leaching in several types of NPK slow decompose applied for corn cultivation in peatland and determine the best dolomite dosage and NPK slow decompose with minimum Nitrogen leaching to optimum sweet corn plant growth in peatland. This research was conducted from August to October 2018 in the Experimental Garden Technical Implementation Unit and Soil Laboratory, Faculty of Agriculture, University of Riau. This research used experimentally and completely randomized design (CRD) factorial. The first factor is dolomite which consists of 4 levels (0 tons.ha-1, 2.5 tons.ha-1, 5 tons.ha-1, dan 7.5 tons.ha-1). The second is NPK slow decompose which consists of 4 levels (NPK single pearl, NPK 13: 6: 27: 4 + 0,65B Mahkota B, NPK 13: 6: 27: 4 + 0,65B Compound Plus Hi-Kay and NPK 13: 8: 27: 4 MgO Ztick). The results showed the administration of dolomite 23.55 g per tube and NPK slow decomposed could reduce Nitrogen leaching, improve physiology and growth of sweet corn plants. Provision of interaction between dolomite 5 ton.ha-1 with NPK slow decomposition (30.25 N, 3.72 P, 12.56 g per tube) produces the best interaction that can reduce the proportion of Nitrogen leaching and it can affects the increasing of plant growth
Utilization of Biochar Rice Husk and Straw to Increase Yield of Upland Rice (Oryza sativa L.) on Ultisol Medium
No full textBeras merupakan bahan makanan pokok sebagian besar penduduk Indonesia dan mengalami defisit setiap tahun. Budidaya padi gogo di lahan marginal seperti Ultisol menjadi salah satu alternatif untuk memenuhi kebutuhan beras. Ultisol memiliki beberapa masalah dalam pengelolaannya seperti keasaman dan kekurangan nutrisi. Diperlukan input seperti sekam padi dan jerami padi berupa residu biochar dan asap cair untuk memperbaiki masalah. Penelitian ini bertujuan untuk mempelajari pengaruh aplikasi biochar, asap cair dan interaksi biochar dan asap cair terhadap pertumbuhan padi gogo di medium Ultisol. Penelitian ini dalam bentuk percobaan faktorial disusun dengan rancangan acak lengkap (RAL). Faktor pertama adalah residu biochar terdiri dari 4 taraf (0/tanpa biochar, 10 ton ha-1 sekam padi, 10 ton ha-1 jerami padi dan 5 ton ha-1 sekam padi + 5 ton ha-1 jerami padi). Faktor kedua adalah asap cair terdiri dari 3 taraf (0/tanpa asap cair, 0.5 ml L-1 sekam padi dan 0.5 ml L-1 jerami padi) masing-masing kombinasi diulang tiga kali. Hasil penelitian menunjukkan bahwa residu biochar sekam padi dan jerami padi masing-masing dosis 10 ton ha-1 meningkatkan tinggi tanaman, jumlah anakan maksimum, jumlah anakan produktif, umur keluar malai dan bobot kering jerami dibandingkan kontrol bahkan pada campuran keduanya (1:1) peningkatannya lebih tinggi. pemberian asap cair sekam padi dan jerami padi dosis 0.5 ml L-1 meningkatkan tinggi tanaman, jumlah anakan maksimum, jumlah anakan produktif, umur keluar malai, bobot kering jerami dibandingkan kontrol. Interaksi campuran residu biochar (sekam padi dan jerami padi) dosis 10 ton ha-1 (1:1) dan asap cair 0.5 ml L-1 (sekam padi dan jerami padi) meningkatkan tinggi tanaman, jumlah anakan maksimum, jumlah anakan produktif, umur keluar malai dan bobot kering jerami dibandingkan kontrol
APLIKASI KOMPOS TANDAN KOSONG KELAPA SAWIT DAN PUPUK NPKMg TERHADAP SIFAT KIMIA TANAH ULTISOL DAN KADAR HARA DAUN KELAPA SAWIT (Elaeis guineensis Jacq)
Get PDFLow productivity of oil palm in Ultisol need to resolve by utilizing appropriate input and efficient soil management. Utilization of  organic waste materials such as oil palm empty bunches (OPEB) is one of way for that. This research was conducted in Kuantan Singingi, Riau from September 2017 to February 2018. The aim of this research is to having dose of OPEB compost and NPKMg fertilizer that can optimize the value of soil chemical characters and nutrient content in leaves. The study determined the effect of composite oil palm empty bunches with cow manure (2:1(w/w)) and NPKMg (13:6:27:4) fertilizer. The study used a completely randomized design consisting of 6 levels :{(2,25 kg NPKMg), (10 kg OPEB compost + 1,75 kg NPKMg), (20 kg OPEBcompost + 1,5 kg NPKMg), (30 kg OPEBcompost+ 1,25 kg NPKMg), (40 kg OPEBcompost + 1,00 kg NPKMg), (50 kg OPEB compost) per tree}, each treatment was repeated 3 times. Parameters measured include soil chemical characters and nutrient content in leaves. The results of study showed, aplication 50 kg per tree TKKS compost was able to increase soil pH. Aplications (2.25 kg NPKMg, 50 kg TKKS compost, 20 kg compost TKKS + 1.50 kg NPKMg and 30 kg compost TKKS + 1.25 kg NPKMg) per tree can increase base saturation. Each treatment application for fertilization has been tested, given the same effect in all soil chemical characters tested beside pH and KB, and same effect in all leaf nutrient contents tested beside Zn.Key words : Palm Oil, Compost, OilPalmEmptyBunches, NPKM
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
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