scholarly journals Spectral Indices: In-Season Dry Mass and Yield Relationship of Flue-Cured Tobacco under Different Planting Dates and Fertiliser Levels

ISRN Agronomy ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ezekia Svotwa ◽  
J. Anxious Masuka ◽  
Barbara Maasdorp ◽  
Amon Murwira
Keyword(s):  
Spectral Characteristics ◽  
Dry Mass ◽  
Coefficient Of Determination ◽  
Planting Dates ◽  
Randomized Design ◽  
Crop Development ◽  
Best Fitting ◽  
Whole Plants ◽  
Relationship Of ◽  
The Relationship

This experiment investigated the relationship between tobacco canopy spectral characteristics and tobacco biomass. A completely randomized design, with plantings on the 15th of September, October, November, and December, each with 9 variety × fertiliser management treatments, was used. Starting from 6 weeks after planting, reflectance measurements were taken from one row, using a multispectral radiometer. Individual plants from the other 3 rows were also measured, and the above ground whole plants were harvested and dried for reflectance/dry mass regression analysis. The central row was harvested, cured, and weighed. Both the maximum NDVI and mass at untying declined with later planting and so was the mass-NDVI coefficient of determination. The best fitting curves for the yield-NDVI correlations were quadratic. September reflectance values from the October crop reflectance were statistically similar (P>0.05), while those for the November and the December crops were significantly different (P<0.05) from the former two. Mass at untying and NDVI showed a quadratic relationship in all the three tested varieties. The optimum stage for collecting spectral data for tobacco yield estimation was the 8–12 weeks after planting. The results could be useful in accurate monitoring of crop development patterns for yield forecasting purposes.

Problematic Internet Use digunakan Ketika Kesepian pada Remaja

2020 ◽  
Vol 14 (1) ◽  
pp. 45-60
Author(s):  
Yashinta Yashinta ◽  
Dwi Hurriyati
Keyword(s):  
Internet Use ◽  
Hypothesis Test ◽  
Problematic Internet Use ◽  
Coefficient Of Determination ◽  
Test Results ◽  
Research Subjects ◽  
Significance Level ◽  
Relationship Of ◽  
The Relationship ◽  
Effective Contribution

This study aims to determine the relationship of loneliness with problematic internet use on boarding students on Silaberanti street in Siantan jaya Opposite Ulu 1 Palembang city. Research subjects numbered 220 people using random sampling methods. Data was collected using a 60 item problematic internet use scale and a 60 item loneliness. Realibility is generated on scale of problematic internet use of 0,955 and loneliness of 0,946.Hypothesis testing uses product moment correlation analysis techniques. Hypothesis test results showed a positive relationshif between loneliness with problematic internet use on boarding students on Silaberanti street in Siantan jaya Opposite Ulu 1 Palembang city r= 0,684 with a significance level of 0,000 (p<0,01). Loneliness in this study made an effective contribution of 46,8% to problematic internet use which can be seen from the coefficient of determination (r²) that is equel to 0,468.

scholarly journals HUBUNGAN ANTARA LATAR BELAKANG PENDIDIKAN FORMAL, PENGETAHUAN, STATUS EKONOMI DAN SIKAP DENGAN UPAYA MASYARAKAT MENGENAI BUDIDAYA Gyrinops versteegii (Gilg.) Domke DI PULAU LOMBOK

2013 ◽  
Vol 1 (1) ◽  
pp. 12
Author(s):  
Taufik Samsuri
Keyword(s):  
Formal Education ◽  
Economic Status ◽  
Background Knowledge ◽  
Educational Background ◽  
Coefficient Of Determination ◽  
Knowledge And Attitudes ◽  
Farming Community ◽  
Quantitative Descriptive ◽  
Relationship Of ◽  
The Relationship

The purpose of this study was: (1) to reveal how formal educational background, knowledge, economic status, attitudes and efforts of the farming community farming Gyrinops versteegii (Gilg.) Domke on the island of Lombok. (2) to determine the relationship of formal educational background, knowledge, and attitudes to the economic status of the farming community efforts Gyrinops versteegii (Gilg.) Domke on the island of Lombok. This type of research is survey research design and descriptive quantitative descriptive correlational. Data were analyzed using descriptive statistics. While the relationship of formal education background, knowledge, economic status and attitudes correlated with community efforts on cultivating Gyrinops versteegii (Gilg.) Domke using bivariate product moment correlation test, followed by regression analysis using the aid package SPSS for Windows 00:17. Results of this study indicate that (1) the level of formal education background, at 25.71% with very low category, knowledge of 67.23% with enough categories, economic status by 50% with the low category, the attitude of 65.40% with enough categories, and cultivation efforts Gyrinops versteegii of 54.42% with low category. (2) The results of analysis of the association in this study showed that there is a significant relationship between formal educational background, knowledge, and attitudes to the economic status of efforts farming Gyrinops versteegii with correlation value of 0.898 and the coefficient of determination (R2) of 0.806.

scholarly journals 257 LEAF PETIOLE NITRATE AND POTASSIUM LEVELS IN POTTED PLANTS GROWN AT THREE NITROGEN AND POTASSIUM LEVELS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 466e-466
Author(s):  
Erica M. Bergman ◽  
Michelle Marshal ◽  
Brian Weesies ◽  
Bill Argo ◽  
John Biernbaum
Keyword(s):  
Leaf Blade ◽  
Dry Mass ◽  
Hydraulic Press ◽  
Water Soluble ◽  
Leaf Petiole ◽  
Potted Plants ◽  
Petiole Nitrate Concentration ◽  
Soluble Fertilizer ◽  
Relationship Of ◽  
The Relationship

Twelve species of flowering potted plants were grown in a peat-based medium with water soluble fertilizer concentrations of 50, 100, or 200 mg·liter-1 N and K2O. Leaf blade or leaf petiole samples were collected six to eight weeks after planting. Sap was expressed using a hydraulic press and levels of nitrate nitrogen and potassium were determined using Cardy flat sensor ion meters. Petiole nitrate level ranged from 520 to 6300 mg·liter-1 and potassium levels ranged from 870 to 3600 mg·liter-1. The petiole nitrate concentration and change in petiole nitrate levels with changes in media nitrate levels was crop dependent. Leaf blade nitrate and potassium concentrations were lower than leaf petiole concentrations. The relationship of petiole nitrate to final plant fresh and dry mass and appearance at flowering will be presented.

scholarly journals HUBUNGAN ANTARA KANDUNGAN SILIKA DENGAN KELIMPAHAN DIATOM BENTHIK DI SEPANJANG SUNGAI PELUS KABUPATEN BANYUMAS

2017 ◽  
Vol 4 (1) ◽  
pp. 61 ◽  
Author(s):  
Siti Umiatun ◽  
Carmudi Carmudi ◽  
Christiani Christiani
Keyword(s):  
Sampling Technique ◽  
Silica Content ◽  
Measured Data ◽  
Coefficient Of Determination ◽  
Total Abundance ◽  
River Waters ◽  
Silica Concentration ◽  
Relationship Of ◽  
The Relationship ◽  
Regression Correlation

Silica is an element that is useful to the organism especially Diatoms (Chrysophyta: Bacillariophyceae). The sources of Silica in waters derive from weathering rock-containing silica. Diatoms are a phytoplankton that able to live as a phytobenthos distributed globally in all types of waters. The purpose of this study was to determine; the silica content, the abundance of diatoms, and the relationship between the content of silica and the abundance of diatoms in the Pelus River Banyumas. This research was conducted as a survey and samples were collected using composite sampling technique at 5 stations. Samples were collected three times with 2 weeks intervals. Two main parameters (diatoms abundance and silica content) and ten supporting parameters (temperature, current velocity, pH, DO, BOD, COD, TSS, TDS, nitrate, and ortofosfat of waters) were measured. Data of analysis calculated in this study including regression correlation analysis to determine the relationship of the silica content and the abundance of diatoms. The silica concentration in the Pelus River waters varies between 112.48-175.00 mg.l-1 with an average of 146 mg.l-1. The total abundance of benthic diatoms was 44,442 ind.cm-2. The highest diatoms abundance was at station II (11,128 ind.cm-2), the lowest was at Station IV (6,828 ind.cm-2). The relationship between silica contained in the waters and abundance of diatoms indicated by the value of R2 (coefficient of determination) by 0.38 or 38%. The abundance of Diatoms are affected 62% by the available silica in the environment, and the rest 38% e rest are determined by other factors.

scholarly journals Potensi Biomassa Dan Karbon Tersimpan Tegakan di Ruang Terbuka Hijau Kota Polewali, Sulawesi Barat

2020 ◽  
Vol 12 (1) ◽  
pp. 49
Author(s):  
Daud Irundu ◽  
Mir A Beddu ◽  
Najmawati Najmawati
Keyword(s):  
Global Warming ◽  
Urban Areas ◽  
Green Space ◽  
Urban Forest ◽  
Urban Forests ◽  
Tree Height ◽  
Strong Relationship ◽  
Coefficient Of Determination ◽  
Relationship Of ◽  
The Relationship

Global warming is one of the major environmental issues of this century. Carbon dioxide (CO2) emissions are the main cause of global warming. Green open space (RTH) such as urban parks, urban forests and green lines play an important role in mitigating global warming and climate change in urban areas because it is able to reduce CO2 from the atmosphere. This study aims to determine the potential of biomass and carbon stored in the Green Open Green Space of Polewali, West Sulawesi. Data collection for stored biomass and carbon is carried out at three green space locations including; Urban forest and city park and green lane each made three plots measuring 20 m x 20 m, and three plots on the Green Line measuring 1200 m. Retrieval of data by measuring tree height and diameter, analysis to obtain the dry volume, biomass and carbon stored for each tree species contained in the Polewali green space. Biomass is obtained by the formula M = BJ x Vk x BEF, the stored carbon value is obtained from the product of biomass by 0.47. The magnitude of the relationship of volume with biomass and carbon uses a regression equation (Ŷ=a+bX). The results show there are types of Glodokan (Polyalthia longifolia), Johar (Senna siamea), Mahogany (Swetenia sp) and Trambesi (Samanea saman) which are spread in the Polewali open green space. Trambesi is a type that has dominant biomass and stored carbon of 381.95 (tons / ha) and 179.52 (ton/ha). Green lane is the type of green space that has the most stored carbon and is currently 440.94 (ton/ha) and 207.24 (ton/ha). The overall green space biomass is 571.83 (ton/ha) and stored carbon is 268.76 (ton/ha) found in urban forests, urban gardens and green belt. The relationship of volume with biomass and stored carbon shows a very strong relationship with the coefficient of determination (R2) of 0.96.  

scholarly journals KORELASI MOTIVASI BELAJAR DENGAN HASIL BELAJAR MAHASISWA ANGKATAN 2015 PROGRAM STUDI PENDIDIKAN FISIKA PADA MATA KULIAH MEKANIKA

2017 ◽  
Vol 8 (1) ◽  
pp. 36
Author(s):  
N.W. S. Darmayanti ◽  
Zulkarnain Zulkarnain
Keyword(s):  
Student Learning ◽  
Learning Outcomes ◽  
Student Learning Outcomes ◽  
Learning Motivation ◽  
Coefficient Of Determination ◽  
Independent Variable ◽  
The Subject ◽  
Motivation And Learning ◽  
Relationship Of ◽  
The Relationship

Abstrak: Penelitian ini bertujuan untuk mengetahui hubungan motivasi belajar dengan hasil belajar mahasiswa angkatan 2015 prodi fisika pada mata kuliah mekanika. Jenis penelitian ini termasuk dalam penelitian korelasional yang bertujuan untuk melihat hubungan antara dua variabel. Dalam penelitian ini terdapat dua variabel, yaitu variabel bebas (Independent Variable) motivasi belajar (X) dan variabel terikat (Dependent Variable) yaitu hasil belajar mahasiswa pada mata kuliah mekanika (Y). Populasi yang digunakan pada penelitian ini adalah semua mahasiswa prodi pendidikan fisika. Sampel penelitiannya adalah seluruh mahasiswa prodi fisika angkatan 2015 yang mengambil mata kuliah mekanika. Data hasil belajar dikumpulkan dengan tes hasil belajar berbentuk tes essay dan motivasi belajar dikumpulkan dengan bentuk angket motivasi. Data dianalisis menggunakan Product Moment yang dikembangkan Karl Pearson dengan bantuan SPSS. Analisis selanjutnya mencari koefisien determinasi di mana rumus yang digunakan adalah rumus “Coefficient of Determination”. Analisis terakhir adalah mencari makna hubungan variable X terhadap Y dengan pengujian lanjutan yaitu uji signifikansi. Hasil penelitian menunjukkan terdapat hubungan yang positif (kuat) antara motivasi belajar dengan hasil belajar yang dapat dilihat dari nilai koefisien korelasi sebesar 0,745. Besar hubungan variabel motivasi belajar dengan hasil belajar adalah sebesar 55,50% yang dilihat dari nilai koefisien determinasinya. Uji signifikansi menunjukkan nilai t hitung lebih besar dari t tabel (3,162,262) yang berarti terdapat hubungan yang signifikan antara motivasi belajar dengan hasil belajar. Abstract: This study aims to determine the relationship of learning motivation with learning physics student outcomes class 2015 studies in the subject of mechanics. This type of research is included in correlational research that aims to know the relationship between two variables. In this study there are two variables, that is independent variable (learning motivation) and dependent variable (student learning outcomes in the subject of mechanics). The population used in this study were all students physics education program. The sample of the research is all students physics class 2015 who take the subject mechanics. student learning outcomes data collected by form essay test and motivation of learning collected by form of motivation questionnaire.Data were analyzed using Product Moment developed by Karl Pearson with the help of SPSS. The next analysis looks for the coefficient of determination in which the formula used is the "Coefficient of Determination" formula. The last analysis is to find the meaning of relationship variable X to Y with advanced testing is the test of significance. The results showed there was a positive (strong) relationship between learning motivation and learning outcomes that can be seen from the correlation coefficient of 0.745. Great relationship of learning motivation variable with learning result is equal to 55,50% which seen from determination coefficient value. Test significance shows the value of t arithmetic greater than t table (3.16 2.262) which means there is a significant relationship between learning motivation and learning outcomes.

scholarly journals HUBUNGAN ECOLITERACY DENGAN PERILAKU PRO-LINGKUNGAN PESERTA DIDIK SMP

2018 ◽  
Vol 5 (2) ◽  
pp. 63
Author(s):  
Novita Nurfajriani ◽  
Eka Putri Azrai ◽  
Diana Vivanti Sigit
Keyword(s):  
High School ◽  
Junior High School ◽  
Random Sampling ◽  
Junior High ◽  
Negative Impact ◽  
Sampling Technique ◽  
Simple Random Sampling ◽  
Coefficient Of Determination ◽  
Relationship Of ◽  
The Relationship

<p align="center"><strong>Abstrak</strong></p><p>Perilaku pro-lingkungan adalah sebuah tindakan yang dilakukan secara sadar untuk mengurangi dampak negatif yang disebabkan oleh aktivitas manusia pada lingkungan. Perilaku pro-lingkungan peserta didik dapat ditingkatkan salah satunya melalui ecoliteracy. Penelitian ini bertujuan untuk mengetahui hubungan ecoliteracy dengan perilaku pro-lingkungan peserta didik SMP. Penelitian ini dilaksanakan di SMPN 45 Jakarta pada semester genap bulan Mei  tahun ajaran 2017-2018. Metode yang digunakan adalah metode deskriptif dengan studi korelasional. Sampel yang digunakan sebanyak 168 peserta didik yang dipilih dengan teknik simple random sampling. Hasil uji prasyarat diketahui bahwa data berdistribusi normal dan homogen. Koefisien korelasi yang diperoleh sebesar 0,171 dan nilai signifikansi sebesar 0,026, artinya terdapat hubungan yang signifikan antara ecoliteracy dengan perilaku pro-lingkungan peserta didik SMP Negeri 45 Jakarta. Koefisien determinasi yang diperoleh sebesar 0,029, artinya ecoliteracy berkontribusi terhadap perilaku pro-lingkungan peserta didik SMP Negeri 45 Jakarta sebesar 2,9%.</p><p><em> </em></p><p><em>Kata kunci: Ecoliteracy, perilaku pro-lingkungan, peserta didik.</em></p><p> </p><p align="center"><strong><em>ABSTRACT</em></strong></p><p><em>Pro-environmental behavior is a conscious act to reduce the negative impact caused by human activity on the environment. Pro-environment behavior in students can be improved through ecoliteracy. This study aims to determine the relationship of ecoliteracy with pro-environment behavior in students of junior high school. This research was conducted at 45 Jakarta junior high school on May 2017-2018. The method used is descriptive method with correlational study. Total of sample are 168 students selected by simple random sampling technique. The result of prerequisite test known that the data are normally distributed and homogeneous. The correlation coefficient is 0.171 and the significance value is 0.026, it means there is a significant correlation between ecoliteracy with pro-environment behavior of students of 45 Jakarta Junior High School. The coefficient of determination is 0.029, it means that ecoliteracy has determine pro-environment behavior of students of 45 Jakarta Junior High School equal to 2.9%.</em></p><p><em> </em></p><p><em>Keywords: Ecoliteracy, pro-environment behavior, student.</em></p>

scholarly journals Antioxidant activity and physiological performance of popcorn seed after saline stress and analysis of seedling images

2020 ◽  
Vol 44 ◽  
Author(s):  
Hugo Cesar Rodrigues Moreira Catão ◽  
Franciele Caixeta ◽  
Amanda Moreira Lopes ◽  
Flavia Andrea Nery-Silva ◽  
Adílio de Sá Júnior
Keyword(s):  
Antioxidant Activity ◽  
Salt Stress ◽  
Dry Mass ◽  
Saline Stress ◽  
Physiological Performance ◽  
Randomized Design ◽  
Physiological Quality ◽  
Completely Randomized Design ◽  
The Relationship

ABSTRACT Salinity influences all germination stages and may adversely affect seedling establishment in the field. The objective of this research was to determine the relationship between the antioxidant activity and the physiological performance of seeds and to verify the efficacy of the imaging analysis of popcorn seedlings after seed exposure to saline stress. A completely randomized design was used that consisted of four replicates in a factorial scheme. This scheme comprised three popcorn hybrids (P618, AP6002, and AP8203) and five saline potential levels (0.0; -0.1; -0.3; -0.6, and -0.9 MPa) that were obtained from KCl solutions of different concentrations. First count germination, germination and seedling vigor classification (strong normal seedlings), and dry mass of seedlings were evaluated to determine the physiological quality of the seed. The images of seedlings were used to evaluate the coleoptile and root lengths, indices of vigor, uniformity, and growth using the Groundeye® software. The activities of the antioxidant enzymes superoxide dismutase (SOD), ascorbate peroxidase (APX), and catalase (CAT) were also determined. Saline stress compromises the physiological quality and antioxidant activity of seeds and the performance of popcorn seedlings. Computerized image analysis using Groundeye® was efficient in evaluating the popcorn seedlings after being subjected to salt stress. Hybrids AP6002 and AP8203 were more tolerant to salt stress than hybrid P618.

Sign in / Sign up

Export Citation Format

Share Document