scholarly journals Estimasi Karbon pada Tegakan Kopi di Lahan Agroforestri Desa Pandansari Kecamatan Poncokusumo Kabupaten Malang

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Riyan Riyadlun Najih ◽  
Luchman Hakim ◽  
Hasan Zayadi

The agroforestry system is a solution offered so that the forest area does not decrease due to forest destruction and the environment is able to perform its function, namely as a carbon storage. This study was aimed to determine the potential for carbon stored in coffee stands and abiotic factors in coffee stands on agroforestry land. Samples by purposive sampling stand samples of Coffeaarabica, Coffea canephora, and Coffea liberica as many as 20 trees with a total sample of 60 stands. the abiotic factor was measured at three representative points. Data obtained in the form of dbh (±1,3 m), type of coffee, plant age, wood dencity, abiotic factor data, biomass, and carbon. Data analysis included tree biomass data with the allometric formula Ketterings dry weight = 0.11 ρ D2.62 (2001) and  allometric formula Arifin dry weight = 0.281 D2.0635 (2001). Data analysis included carbon biomass = dry weight x 0.47. The results showed that the largest carbon storage was in Coffea liberica, then Coffea canephora and the smallest carbon storage was in Coffeaarabica. abotic factors in coffee agroforestry show soil moisture 18.3%, air humidity 60 - 75%, soil pH  7.3, soil temperature  21 ° C, air temperature 21 - 25 ° C, light intensity  877 lux, and altitude ranges from 906 - 934 m asl.Keywords: allometric, coffee, agroforestry, abiotic factors, carbonABSTRAKSistem agroforestri merupakan solusi yang ditawarkan agar luas hutan tidak semakin berkurang akibat kerusakan hutan dan lingkungan mampu melakukan fungsinya yakni sebagai penyimpan karbon. Penelitian ini bertujuan untuk mengetahui potensi karbon tersimpan pada tegakan kopi dan faktor abiotik pada tegakan kopi di lahan agroforestri. Pemilihan sampel tegakan kopi secara purposive sampling, tiap sampel tegakan Coffea arabica, Coffea canephora, dan Coffea liberica berjumlah 20 pohon dengan jumlah total sampel 60 tegakan. Faktor abiotik diukur pada tiga titik representatif. Data yang diperoleh berupa dbh (±1,3 m), spesies kopi, umur tanaman, berat jenis kayu,data faktor abiotik, biomassa, dan karbon. Analisis data perhitungan biomassa meliputi rumus allometrik Ketterings berat kering = 0,11 ρ D2,62  (2001) dan rumus allometrik Arifin berat kering = 0,281 D2,0635(2001). Analisis data biomassa karbon = berat kering x 0.47. Hasil penelitian menunjukkan simpanan karbon terbesar terdapat pada Coffea liberica, kemudian Coffea canephora dan simpanan karbon paling kecil pada Coffea arabica. faktor abotik di agroforestri kopi menunjukkan kelembaban tanah 18.3%, Kelembaban udara 60 - 75%, pH tanah 7,3, Suhu tanah 21°C, suhu udara 21 - 25°C, intensitas cahaya 877 lux dan ketinggian tempat berkisar 906 – 934 m dpl.Kata kunci: allometrik, kopi, agroforestry, faktor abiotic, karbon

Antioxidants ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 143 ◽  
Author(s):  
Rocío Rodríguez-Gómez ◽  
Jérôme Vanheuverzwjin ◽  
Florence Souard ◽  
Cédric Delporte ◽  
Caroline Stevigny ◽  
...  

Coffee is a beverage widely consumed in the world. The coffee species most commercialized worldwide are Arabica (Coffea arabica) and Robusta (Coffea canephora). Roasted coffee beans are the most used, but coffee leaves are also consumed as infusion in several countries for traditional medicinal purposes. They contain several interesting phenolic antioxidant compounds mainly belonging to chlorogenic acids (CGAs). In the present work, a liquid chromatography-electrochemical detection (LC-EC) method was developed for the determination of three main chlorogenic acid isomers, namely 3-, 4-, and 5-caffeoylquinic acids (CQA), in coffee leaves aqueous extracts. Samples from eight coffee species, namely; Coffea arabica, Coffea canephora, Coffea liberica, Coffea humilis, Coffea mannii, Coffea charrieriana, Coffea anthonyi, and Coffea liberica var. liberica, were grown and collected in tropical greenhouses. Linearity of the calibration graphs was observed in the range from the limit of quantification to 1.0 × 10−5 M, with R2 equal to 99.9% in all cases. High sensitivity was achieved with a limit of detection of 1.0 × 10−8 M for 3-CQA and 5-CQA (i.e., 3.5 µg/L) and 2.0 × 10−8 M for 4-CQA (i.e., 7.1 µg/L). The chromatographic profile of the samples harvested for each Coffea species was studied comparatively. Obtained raw data were pretreated for baseline variations and shifts in retention times between the chromatographic profiles. Principal Component Analysis (PCA) was applied to the pretreated data. According to the results, three clusters of Coffea species were found. In the water sample extracts, 5-CQA appeared to be the major isomer, and some species contained a very low amount of CQAs. Fluctuations were observed depending on the Coffea species and harvesting period. Significant differences between January and July were noticed regarding CQAs content. The species with the best CQAs/caffeine ratio was identified. The LC-EC data were validated by liquid chromatography-high resolution mass spectrometry (LC-HRMS).


2019 ◽  
Vol 5 (2) ◽  
pp. 24-29
Author(s):  
Yuliana Musrifatul Maula ◽  
Ari Hayati ◽  
Hasan Zayadi

Corn is a seasonal plant. Corn is one of the crop commodities that has an important role in agriculture and the economy in Indonesia. Problems that often occur in the cultivation of corn (Zea mays) are such as water availability, land area, weather, disease and pest attacks. Insects are animals which include an important role in the agricultural ecosystem, but not all insects are beneficial for these plants. Insects also consist of several types of Orders, namely the Order of Coleoptera, Order of Diptera, Order of Lepidoptera, Order of Homoptera, Order of Hemiptera, and Order of Thysanoptera. Insects also have their respective statuses as predators, pests, pollinators, and suckers. This study aims to identify the types of insects on cornfields and determine the effect of abiotic factor correlations on the number of insects on cornfields. This research uses quantitative descriptive method, the retrieval of insects with the absolute method and this study makes direct observations (visual) and the determination of plots using purposive sampling. The results showed 5 orders (Odonata, Lepidoptera, Orthoptera, Coleoptera, and Hemiptera), 6 families (Libellulidae, Nymphalidae, Pieridae, Acrididae, Coccinellidae, and Pentatomidae) and 9 kinds of insects. The most common insects are found in the Odonata Order, as many as 51 birds and the least insects found were found in the order of 2 Lepidoptera Familia Acrididae. Abiotic factors measured are temperature, humidity, wind speed and light intensity. Wind speed is related to the arrival of insects that come on cornfields. Keywords:corn plant (Zea mays),Insects, abiotic factor. ABSTRAK Jagung merupakan tanaman musiman. Jagung termasuk salah satu komoditas tanaman yang mempunyai peranan penting dalam pertanian dan juga perekonomian di Indonesia. Masalah yang sering terjadi dalam budidaya tanaman jagung (Zea mays) yaitu seperti ketersediaan air, luas lahan, cuaca, serangan penyakit dan hama. Serangga merupakan hewan yang termasuk memegang peranan penting dalam ekosistem pertanian, tetapi tidak semua serangga menguntungkan untuk tanaman tersebut. Serangga juga terdiri dari beberapa jenis Ordo yaitu Ordo Coleoptera, Ordo Diptera, Ordo Lepidoptera, Ordo Homoptera, Ordo Hemiptera, dan Ordo Thysanoptera. Serangga juga memiliki status masing-masing yaitu sebagai predator, hama, penyerbuk, dan penghisap. Penelitian ini bertujuan untuk mengidentifikasi macam-macam serangga pada lahan tanaman jagung dan mengetahui pengaruh korelasi faktor abiotik terhadap jumlah serangga pada lahan tanaman jagung. penelitian ini menggunakan metode deskriptif kuantitatif, pengambilan serangga dengan metode mutlak dan penelitian ini melakukan pengamatan secara langsung (visual) dan penentuan plot menggunakan Purposive Sampling. Hasil penelitian menunjukkan 5 ordo (Odonata, Lepidoptera, Orthoptera, Coleoptera, dan Hemiptera), 6 familia (Libellulidae, Nymphalidae, Pieridae, Acrididae, Coccinellidae, dan Pentatomidae) dan 9 macam serangga. Serangga yang paling banyak ditemukan yaitu terdapat pada Ordo Odonata yaitu sebanyak 51 ekor dan serangga yang paling sedikit ditemukan yaitu terdapat pada Ordo Lepidoptera Familia Acrididae sebanyak 2 ekor. Faktor abiotik yang diukur yaitu suhu, kelembaban, kecepatan angin dan intensitas cahaya. Kecepatan angin berhubungan terhadap kedatangan serangga yang datang pada lahan tanaman jagung. Kata kunci: tanaman jagung (Zea mays), Serangga, faktor abiotik


2017 ◽  
Vol 12 (2) ◽  
pp. 156 ◽  
Author(s):  
Filipe Gimenez Carvalho ◽  
Gustavo Hiroshi Sera ◽  
Elder Andreazi ◽  
Tumoru Sera ◽  
Inês Cristina De Batista Fonseca ◽  
...  

A seca é um dos fatores limitantes ao desenvolvimento dos cafeeiros arábicos e fontes de tolerância existem nas diferentes espécies de Coffea spp. O objetivo neste trabalho foi avaliar a tolerância à seca em mudas de 21 genótipos de café, portadores de genes de diferentes espécies, por meio da avaliação do grau de murchamento de suas folhas quando submetidas a períodos de restrição hídrica. O delineamento experimental foi inteiramente ao acaso, com 24 repetições de uma muda de seis meses de idade por parcela. O experimento foi conduzido em casa de vegetação no Instituto Agronômico do Paraná (IAPAR) em Londrina, Paraná, Brasil. Foram efetuadas duas avaliações visuais, por um índice de murcha das folhas, com notas de 1 a 9, seis dias após o início da restrição hídrica. As avaliações visuais quanto à intensidade de murcha em mudas permitiram discriminar satisfatoriamente genótipos com maior tolerância à seca. O genótipo mais tolerante à seca foi IAPAR 11260, um Coffea arabica (portador de genes de Coffea racemosa), seguido de Coffea arabica da Etiópia E368, ‘IPR 100’ (portador de genes de Coffea liberica) e ‘IPR 103’ (portador de genes de Coffea canephora). O Coffea canephora cv. ‘Apoatã IAC 2258’ foi mais sensível à seca do que todos os genótipos de Coffea arabica.


Genome ◽  
2012 ◽  
Vol 55 (12) ◽  
pp. 825-833 ◽  
Author(s):  
Priscila Mary Yuyama ◽  
Luiz Filipe Protasio Pereira ◽  
Tiago Benedito dos Santos ◽  
Tumoru Sera ◽  
Laurival Antonio Vilas-Boas ◽  
...  

The genus Coffea possesses about 100 species, and the most economically important are Coffea canephora and Coffea arabica. The latter is predominantly self-compatible with 2n = 4x = 44, while the others of the genus are diploid with 2n = 2x = 22 and mostly self-incompatible. Studies using molecular markers have been useful to detect differences between genomes in Coffea; however, molecular and cytogenetic studies have produced only limited information on the karyotypes organization. We used DOP–PCR to isolate repetitive elements from genome of Coffea arabica var. typica. The pCa06 clone, containing a fragment of 775 bp length, was characterized by sequencing and used as a probe in chromosomes of C. arabica and six other species: C. canephora, Coffea eugenioides, Coffea kapakata, Coffea liberica var. dewevrei, Coffea racemosa, and Coffea stenophylla. This insert shows similarities with a gag protein of the Ty3-gypsy-like super-family. Dot blot and FISH analyses demonstrated that pCa06 is differentially accumulated between species and chromosomes. Signals appeared scattered and clustered on the chromosomes and were also associated with heterochromatic regions. While the literature shows that there is a high karyotype similarity between Coffea species, our results point out differences in the accumulation and dispersion of this Ty3-gypsy-like retrotransposon during karyotype differentiation of Coffea.


2019 ◽  
pp. 577-599
Author(s):  
Jimmy Villalta-Villalobos ◽  
Andrés Gatica-Arias

Introducción. El café (Coffea spp) es uno de los cultivos más importantes a nivel mundial y provee sustento económico a millones de personas en países en vías de desarrollo. Existen más de las 130 especies del género Coffea, pero solo tres son cultivadas comercialmente: Coffea arabica L. (2n=4x=44), Coffea canephora P. (2n=2x=22) y Coffea liberica Bull. (2n=2x=22). Las cuales presentan limitantes para su mejoramiento genético a través de programas convencionales por su carácter perenne y diferencias de nivel de ploidía e incompatibilidad. Además, existen características de importancia como resistencia a plagas o patógenos, que no se encuentran presentes en el germoplasma disponible. Técnicas de ingeniería genética se han utilizado para solventar esta barrera y se han generadoavances significativos durante las últimas décadas. Objetivo. El objetivo del presente trabajo fue proporcionar un panorama de las metodologías y avances en mejoramiento genético a través del tiempo que se han realizado en café,y finaliza con perspectivas sobre el uso de nuevas tecnologías que han surgido en los últimos años. Desarrollo. Elmejoramiento inició con la selección por cruces y retrocruces interespecíficos, para pasar a la selección asistida pormarcadores moleculares. Posteriormente, el cultivo y fusión de protoplastos fue reportado, con el inconveniente en su proceso de regeneración. La ingeniería genética por medio de las técnicas físicas (electroporación y biobalística) y biológicas (A. tumefaciens y A. rhizogenes), ayudó a sobrepasar las limitantes de regeneración, aunque los procesosde optimización aún son laboriosos, por lo que, nuevas tecnologías de edición de genomas como CRISPR-Cas9,pueden solucionar problemas de tiempo y trabajo en el laboratorio para el cultivo. Conclusión. El mejoramiento del café inició hace tres décadas y ha progresado principalmente desde el inicio de las tecnologías transgénicas, y con lasnuevas técnicas de modificación específica de genes, el cultivo se beneficiará en los próximos años.


Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1704
Author(s):  
Federico Berti ◽  
Luciano Navarini ◽  
Silvia Colomban ◽  
Cristina Forzato

The synthesis of five hydroxycinnamoyl amides (HCAs) was accomplished and their identification and quantification in the green coffee bean samples of Coffea arabica, Coffea canephora, and Coffea liberica was performed. The HCAs p-coumaroyl-N-tyrosine 1b, caffeoyl-N-phenylalanine 2b, caffeoyl-N-tyrosine 3b, and p-coumaroyl-N-tryptophan 4b were characteristic of the C. canephora species while caffeoyl-N-tryptophan 5b was present in both C. canephora and C. arabica, but with higher content in C. canephora. The HCAs presence was also analyzed in C. liberica for the first time and none of the targeted compounds was found, indicating that this species is very similar to C. arabica species. Between C. canephora samples from various origins, significant differences were observed regarding the presence of all the HCAs, with C. canephora from Tanzania containing all five derivatives.


2018 ◽  
Vol 9 (2) ◽  
pp. 33-49
Author(s):  
Karina Harjanto

The purpose of this research is to examine the effect of company’s size, profitability, solvability, and the size of the accounting firm towards audit delay. The object in this research are property and real estate companies listed in Bursa Efek Indonesia (BEI) for the period 2013-2015. The sample is selected by purposive sampling method. There are 42 companies selected as sample. Data used in this research is a secondary data such as audited financial reports. Data analysis uses multiple linear regression. The result of this research shows that company’s size, profitability, and solvability have no influence on audit delay, while the size of accounting firm has significant positive influences on audit delay. The result also shows that company’s size, profitability, solvability, and the size of of the accounting firm simultaneously influence audit delay. Keywords: audit delay, company’s size, profitability, solvability, size the accounting firm


2019 ◽  
Vol 4 (1) ◽  
pp. 37-54
Author(s):  
James Tumewu ◽  
Wiwin Wahyuni

Tax evasion is a tax deductible scheme that is owed by violating the provisions of taxation (illegal). Tax evasion is usually done by the company by making false invoices, not recording some sales, or preparing fake financial statements, but the practice of tax evasion like this is often caught, thus the mode of tax evasion is now changing. Perception is the response of something or is the process of knowing some things through the senses. This research is interested to prove the perception of the students of economics faculty regarding the tax evasion, where these students have received taxation class and practice. This study uses questionnaires to obtain students perception data, and use purposive sampling in obtaining sample research. Data analysis technique used is multiple-linear regression. The result of research shows that only discrimination variables affect the tax evasion based on the perception of the students of economics faculty, while the variables of justice, taxation system and understanding of taxation do not affect tax evasion based on the perception of the students of Economics Faculty, Wijaya Kusuma Surabaya University.


Jurnal KATA ◽  
2018 ◽  
Vol 2 (2) ◽  
pp. 371
Author(s):  
Rissari Yayuk

<p><em>This study examines the focal point of illustration of the first winner of the contest for writing opinion of the senior high school level in South Kalimantan. This study aims to describe 1) the focus point of illustration of the title of the first winner of the contest writing opinion of the senior high school level in South Kalimantan? 2) the focal point of information information of the first winner of writing contest for high school level opinion in South Kalimantan; 3) the focal point of illocution of the moral message of the first winner of the high school opinion writing contest in South Kalimantan. The study was conducted in October 2016 at Balai Bahasa Balai. The method used is qualitative deskreptif. The technique used in this paper is the sampling purposive sampling. The sample used as data is the first winner of the contest for writing the opinion of the senior high school level in South Kalimantan, in South Kalimantan Language Hall, in 2016. This first winner is named Norhidayah, a student of SMAN 4 Banjarbaru, with the title of Language Role in Introducing Children of Nation. Data analysis is done by steps, data collection, data identification, classification, selection and interpretation. The results of data analysis are presented in ordinary words with technical terminology. Based on the results of the study of the focal point of the article, the first winner of the South Kalimantan high school opinion writing contest includes the focus point of the title illusion, the focus point of information illocution, and the focus point of the illustration of the moral mandate. The focus of the title illustration can be seen in the meaning of its ilokusinya, language, and suitability of the theme in the title. The focus point of the information illumination of the article can be seen in its meaning of ilokusinya, its language style, and the type of discourse. The focus point of the illustration of its moral mandate can be seen in the author's expectations contained in the title, the focus of the information, and on the final paragraph of the paper</em></p><p><em><br /></em></p><p>Masalah yang dibahasa mengenai titik fokus ilokusi  artikel pemenang pertama  lomba penulisan opini tingkat SLTA se-Kalimantan Selatan. Penelitian ini bertujuan mendeskripsikan 1) titik fokus ilokusi judul artikel pemenang pertama  lomba penulisan opini tingkat SLTA se-Kalimantan Selatan? 2) titik fokus ilokusi informasi artikel pemenang pertama  lomba penulisan opini tingkat SLTA se-Kalimantan Selatan; 3) titik fokus ilokusi amanat moral  artikel pemenang pertama  lomba penulisan opini tingkat SLTA se-Kalimantan Selatan. Penelitian ini dilaksanakan pada bulan Oktober 2016 di Balai Bahasa Kalimantan Selatan. Metode yang digunakan adalah deskreptif kualitatif. Teknik yang digunakan dalam tulisan ini adalah pengambilan sampel purposive sampling. Sampel yang dijadikan data adalah artikel pemenang pertama lomba penulisan opini tingkat SLTA se-Kalimantan Selatan, di Balai Bahasa Kalimantan Selatan, tahun 2016. Pemenang pertama ini bernama Norhidayah, siswa SMAN 4 Banjarbaru, dengan judul Peran Bahasa dalam Mencerdaskan Anak Bangsa. Analisis data dilakukan dengan  langkah-langkah, pengumpulan data, indentifikasi data, klasifikasi, seleksi dan  interpretasi. Hasil analisis data disajikan dengan kata-kata biasa dengan terminologi yang teknis sifatnya. Berdasarkan hasil kajian titik fokus ilokusi artikel pemenang pertama  lomba penulisan opini tingkat SLTA se-Kalimantan Selatan  meliputi titik fokus ilokusi judul, titik fokus ilokusi  informasi , dan  titik fokus ilokusi amanat moral.Titik fokus ilokusi judul dapat dilihat pada makna ilokusinya, gaya bahasanya, daya bahasa, dan kesesuaian tema pada judul. Titik fokus ilokusi informasi artikel dapat dilihat pada makna ilokusinya, gaya bahasanya, dan jenis wacananya.Titik fokus ilokusi amanat moralnya dapat dilihat pada harapan penulis yang terdapat pada judul, fokus informasi, dan pada paragrap akhir karya tulis</p>


2021 ◽  
pp. 129716
Author(s):  
Gustavo Galo Marcheafave ◽  
Cláudia Domiciano Tormena ◽  
Amelia Elena Terrile ◽  
Carlos Alberto Rossi Salamanca-Neto ◽  
Elen Romão Sartori ◽  
...  

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