scholarly journals Influence of cultivation technology on the color of raw potato tubers

2020 ◽  
Vol 74 (4) ◽  
pp. 95-114
Author(s):  
PIOTR PSZCZÓŁKOWSKI ◽  
BARBARA SAWICKA ◽  
BARBARA KROCHMAL-MARCZAK
Keyword(s):  
Control Object ◽  
Color Measurement ◽  
Potato Tubers ◽  
Effective Microorganisms ◽  
Potato Blight ◽  
First Order ◽  
Experimental Station ◽  
Cultivation Technology ◽  
Order Factor ◽  
Cultivar Assessment

Results of the research were based on a field experiment carried out in 2014‒2016 at the Experimental Station of Cultivar Assessment in Uhnin (51°34'N, 23°02'E), on podzolic slightly acidic soil. The experiment was carried out using random sub-blocks, in a dependent split-plot system, in triplicate. The first-order factor was potato cultivars (‘Vineta’ and ‘Satina’), and the second-order factor consisted of six cultivation technologies: A − using fungicides to control potato blight, technologies: B, C, D, E − with the application of effective microorganisms, and technology F − without the use of fungicides and effective microorganisms as a control object. The scope of the research included assessing the color of the raw tubers pulp. To determine the color of raw potato, the method of trichromatic colorimetry was used applying the Konica Minolta CM-5 spectrophotometer. The color measurement of raw tubers was carried out in the CIEL*a*b* system. Cultivation technology with fungicide application significantly contributed to the brightness change of the raw tuber flesh compared to the technology (D), where for the treatment, as in the growing season, effective microorganisms were used. Genetic properties of cultivars determined the color brightness, as well as its trichromatic coordinates.

scholarly journals Impact of ultrasounds on physicochemical characteristics of potato tubers

2020 ◽  
Vol 75 (1) ◽  
pp. 85-104
Author(s):  
BARBARA SAWICKA ◽  
PIOTR PSZCZÓŁKOWSKI ◽  
HONORATA DANILČENKO ◽  
ELVYRA JARIENE
Keyword(s):  
Dry Matter ◽  
Starch Content ◽  
Control Object ◽  
Physicochemical Characteristics ◽  
Potato Seed ◽  
Potato Tubers ◽  
Seed Material ◽  
Alkaline Reaction ◽  
Textural Parameters ◽  
Order Factor

The goal of the study was to determine the effect of sonication of different potato seed material cultivars on physicochemical properties. Tuber samples from a field experiment conducted in Parczew (51°38'N, 22°54'E) in 2015–2017 were used for the study. The experiment was carried out by the method of randomized sub-blocks, in a split-plot dependent system. The first order factor were pre-planting treatments: 1) the use of ultrasounds, 2) control object without ultrasounds. The second order factor consisted of 10 potato cultivars of all earliness groups. Seed material was a subject to immerse sonication using an ultrasonic device. Following parameters were evaluated: dry matter of tubers, starch content, textural features, acidity (pH) of potato juice. Sonication contributed to the increase in dry matter and starch contents in tubers, the change in pH towards alkaline reaction, and textural parameters of raw and cooked tubers were increased.

scholarly journals Effect of fertilization on the growth rate of aboveground part of Jerusalem artichoke

2019 ◽  
Vol 74 (3) ◽  
pp. 67-79
Author(s):  
DOMINIKA SKIBA
Keyword(s):  
Podzolic Soil ◽  
Jerusalem Artichoke ◽  
Mineral Fertilization ◽  
Maximum Increase ◽  
First Order ◽  
Aboveground Part ◽  
Experimental Station ◽  
Standard Object ◽  
Order Factor ◽  
The University

The research was based on the field experiment conducted in 2013–2015 at the Experimental Station of the University of Life Sciences, in Parczew (51°38'24"N, 22°54'02"E), on podzolic soil. The experiment was established using the split-split-plot method in three replications. The factors of the first order were three cultivars: ‘Albik’, ‘Rubik’ and ‘Violet de Rennes’. The second order factor was mineral fertilization (N0P0K0 – as standard object and P43, K124, N100, P43K124, N50P43K124, N100P43K124, N150P43K124), calculated as the elemental form of fertilizers. As the basic fertilization, bovine manure was used in the amount of 30 t·ha–1. The aim of the research was to develop the basis for managing the fertilization of Jerusalem artichoke, which will allow to obtain the maximum increase of aboveground part of this species. It was found that for the rate of plant growth, the most optimal fertilization was manure and mineral fertilization in the amount of 100 kg of N·ha–1 in the nitrate-ammonium form. The phosphorus-potassium fertilization, despite the use of manure, significantly reduced the growth of plants in comparison with the standard object.

scholarly journals The Impact of Effective Microorganisms on Flesh Color and Chemical Composition of Raw Potato Tubers

2021 ◽  
Vol 11 (19) ◽  
pp. 8959
Author(s):  
Piotr Pszczółkowski ◽  
Barbara Krochmal-Marczak ◽  
Barbara Sawicka ◽  
Mateusz Pszczółkowski
Keyword(s):  
Field Experiments ◽  
Potato Cultivar ◽  
Color Measurement ◽  
Flesh Color ◽  
Effective Microorganisms ◽  
Potato Blight ◽  
Potato Varieties ◽  
Tuber Flesh ◽  
Cultivation Practices ◽  
The Impact

The objective of this study was to develop an innovative method of potato cultivation, with limited use of chemicals, for use in food processing. The results of the research are based on field experiments carried out between 2015 and 2017 at the Experimental Station in Parczew, Poland. The first-order factors were cultivation practices: A—standard cultivation practices with fungicides to control potato blight; and cultivation practices B, C, and D using the application of effective microorganisms (EM). The potato varieties were the second-order factor. The scope of the research included assessing the flesh color of the raw tubers and the content of dry mass, sugars and vitamin C. The color measurement of raw tubers was carried out using the CIEL *a *b* system. Cultivation methods using applications of effective microorganisms contributed significantly to the change in color brightness of the raw tuber flesh compared to the standard methods. The flesh color of the research potato cultivar tubers, their trichromatic coordinates and the reactions of potato varieties were determined according to the cultivation practices used. It was found that the brightness of the color of raw tuber flesh depends on the content of dry matter and the content of reducing sugars in the tubers.

Challenging the Multidimensional Conception of Perceived Person-Environment Fit

2020 ◽  
pp. 1-9
Author(s):  
Julian M. Etzel ◽  
Gabriel Nagy
Keyword(s):  
Higher Education ◽  
University Students ◽  
Educational Outcomes ◽  
Factor Model ◽  
Higher Order ◽  
Substantial Proportion ◽  
Unique Variance ◽  
First Order ◽  
Person Environment Fit ◽  
Order Factor

Abstract. In the current study, we examined the viability of a multidimensional conception of perceived person-environment (P-E) fit in higher education. We introduce an optimized 12-item measure that distinguishes between four content dimensions of perceived P-E fit: interest-contents (I-C) fit, needs-supplies (N-S) fit, demands-abilities (D-A) fit, and values-culture (V-C) fit. The central aim of our study was to examine whether the relationships between different P-E fit dimensions and educational outcomes can be accounted for by a higher-order factor that captures the shared features of the four fit dimensions. Relying on a large sample of university students in Germany, we found that students distinguish between the proposed fit dimensions. The respective first-order factors shared a substantial proportion of variance and conformed to a higher-order factor model. Using a newly developed factor extension procedure, we found that the relationships between the first-order factors and most outcomes were not fully accounted for by the higher-order factor. Rather, with the exception of V-C fit, all specific P-E fit factors that represent the first-order factors’ unique variance showed reliable and theoretically plausible relationships with different outcomes. These findings support the viability of a multidimensional conceptualization of P-E fit and the validity of our adapted instrument.

scholarly journals Mathematical Creativity in Adults: Its Measurement and Its Relation to Intelligence, Mathematical Competence and General Creativity

2021 ◽  
Vol 9 (1) ◽  
pp. 10
Author(s):  
Michaela A. Meier ◽  
Julia A. Burgstaller ◽  
Mathias Benedek ◽  
Stephan E. Vogel ◽  
Roland H. Grabner
Keyword(s):  
Exploratory Study ◽  
Mathematical Creativity ◽  
Good Reliability ◽  
Mathematical Competence ◽  
First Order ◽  
The Past ◽  
Confirmatory Factor ◽  
Order Factor ◽  
General Creativity ◽  
Creativity Measure

Mathematical creativity is perceived as an increasingly important aspect of everyday life and, consequently, research has increased over the past decade. However, mathematical creativity has mainly been investigated in children and adolescents so far. Therefore, the first goal of the current study was to develop a mathematical creativity measure for adults (MathCrea) and to evaluate its reliability and construct validity in a sample of 100 adults. The second goal was to investigate how mathematical creativity is related to intelligence, mathematical competence, and general creativity. The MathCrea showed good reliability, and confirmatory factor analysis confirmed that the data fitted the assumed theoretical model, in which fluency, flexibility, and originality constitute first order factors and mathematical creativity a second order factor. Even though intelligence, mathematical competence, and general creativity were positively related to mathematical creativity, only numerical intelligence and general creativity predicted unique variance of mathematical creativity. Additional analyses separating quantitative and qualitative aspects of mathematical creativity revealed differential relationships to intelligence components and general creativity. This exploratory study provides first evidence that intelligence and general creativity are important predictors for mathematical creativity in adults, whereas mathematical competence seems to be not as important for mathematical creativity in adults as in children.

Underlying Common Factors of Adolescent Problem Behaviors

2002 ◽  
Vol 29 (2) ◽  
pp. 161-182 ◽  
Author(s):  
Lening Zhang ◽  
John W. Welte ◽  
William F. Wieczorek
Keyword(s):  
Problem Behaviors ◽  
Latent Variable ◽  
Factor Model ◽  
Common Factor ◽  
Measurement Model ◽  
First Order ◽  
Adolescent Problem Behaviors ◽  
The Common ◽  
Order Factor ◽  
Second Order Factor Analysis

The Buffalo Longitudinal Study of Young Men was used to address the possibility of a common factor underlying adolescent problem behaviors. First, a measurement model with a single first-order factor was compared to a model with three separate correlated first-order factors. The three-factor model was better supported, making it logical to conduct a second-order factor analysis, which confirmed the logic. Second, a substantive model was estimated in each of two waves with psychopathic state as the common factor predicting drinking, drug use, and delinquency. Psychopathic state was stable across waves. The theory that a single latent variable accounts for large covariance among adolescent problem behaviors was supported.

scholarly journals Can We Compare Solidarity Across Europe? What, Why, When, and How to Assess Exact and Approximate Equivalence of First- and Second-Order Factor Models

2021 ◽  
Vol 3 ◽  
Author(s):  
Vera Lomazzi
Keyword(s):  
Factor Model ◽  
Second Order ◽  
Three Dimensions ◽  
Alignment Method ◽  
Cross Sectional ◽  
Political Values ◽  
First Order ◽  
Measurement Models ◽  
European Values ◽  
Order Factor

Although measurement invariance is widely considered a precondition for meaningful cross-sectional comparisons, substantive studies have often neglected evaluating this assumption, thereby risking drawing conclusions and making theoretical generalizations based on misleading results. This study offers a theoretical overview of the key issues concerning the measurement and the comparison of socio-political values and aims to answer the questions of what must be evaluated, why, when, and how to assess measurement equivalence. This paper discusses the implications of formative and reflective approaches to the measurement of socio-political values and introduces challenges in their comparison across different countries. From this perspective, exact and approximate approaches to equivalence are described as well as their empirical translation in statistical techniques, such as the multigroup confirmatory factor analysis (MGCFA) and the frequentist alignment method. To illustrate the application of these methods, the study investigates the construct of solidarity as measured by European Values Study (EVS) and using data collected in 34 countries in the last wave of the EVS (2017–2020). The concept is captured through a battery of nine items reflecting three dimensions of solidarity: social, local, and global. Two measurement models are hypothesized: a first-order factor model, in which the three independent dimensions of solidarity are correlated, and a second-order factor model, in which solidarity is conceived according to a hierarchical principle, and the construct of solidarity is reflected in the three sub-factors. In testing the equivalence of the first-order factor model, the results of the MGCFA indicated that metric invariance was achieved. The alignment method supported approximate equivalence only when the model was reduced to two factors, excluding global solidarity. The second-order factor model fit the data of only seven countries, in which this model could be used to study solidarity as a second-order concept. However, the comparison across countries resulted not appropriate at any level of invariance. Finally, the implications of these results for further substantive research are discussed.

scholarly journals Examining the Impostor-Profile—Is There a General Impostor Characteristic?

2021 ◽  
Vol 12 ◽  
Author(s):  
Fabio Ibrahim ◽  
Johann-Christoph Münscher ◽  
Philipp Yorck Herzberg
Keyword(s):  
Convergent Validity ◽  
Factor Model ◽  
Second Order ◽  
Model Fit ◽  
Impostor Phenomenon ◽  
General Factor ◽  
Order Model ◽  
First Order ◽  
Order Factor ◽  
Best Fit

The Impostor-Profile (IPP) is a six-dimensional questionnaire measuring the Impostor Phenomenon facets. This study aims to test (a) the appropriateness of a total score, (b) measurement invariance (MI) between gender, (c) the reliability of the IPP, and (d) the convergent validity of the IPP subscales. The sample consisted of N = 482 individuals (64% female). To identify whether the scales of the IPP form a total score, we compared four models: (1) six correlating subscales, (2) a general factor model, (3) a second-order model with one second-order factor and six first-order factors, and (4) a bifactorial model with six group factors. The bifactorial model obtained the best fit. This supports the assumption of a total impostor score. The inspection of structural validity between gender subgroups showed configural, metric, and partial scalar MI. Factor mean comparisons supported the assumption that females and males differ in latent means of the Impostor Phenomenon expressions. The omega coefficients showed sufficient reliability (≥0.71), except for the subscale Need for Sympathy. Overall, the findings of the bifactor model fit and construct validity support the assumption that the measurement through total expression is meaningful in addition to the theoretically formulated multidimensionality of the Impostor Phenomenon.

Die persoonlikheidsprofiel van suksesvolle bewakingsdienspersoneel

1996 ◽  
Vol 22 (3) ◽  
Author(s):  
T. L. Nell ◽  
L. Kamfer ◽  
R. P. Van Der Merwe ◽  
D. J. L. Venter
Keyword(s):  
Discriminant Analysis ◽  
South African ◽  
Second Order ◽  
Stepwise Discriminant Analysis ◽  
Personality Profile ◽  
First Order ◽  
Correctional Services ◽  
Order Factor ◽  
Independent Criterion ◽  
Better Than

The personality profile of successful prison warders. In an attempt to develop a personality profile for successful prison warders, scores on CattelFs 16-PF (SA92-form) were obtained from 361 warders employed by the South African Department of Correctional Services. Independent criterion information (tempo of promotion) was also obtained and used as indicator of job success. Using Hotelling's T2, it was found that the first order factor profiles of successful and unsuccessful warders differed significantly. There was no difference in their second order profiles. By means of stepwise discriminant analysis with personality as independent and success (expressed as a dichotomy) as the dependant variable, four first order factors were identified and formulae derived which predicted 14,8 better than chance whether a warder would be correctly classified as successful or not on the dichotomous success criterion. Opsomming In 'n poging om 'n persoonlikheidsprofiel vir suksesvolle bewakingsdienspersoneel saam te stel, is response op Cattell se 16-PF (SA92-vorm) vanaf 361 bewakingsdienspersoneellede werksaam by die Suid-Afrikaanse Departement van Korrektiewe Dienste, verkry. Inligting in terme van onafhanklike kriterium (tempo van bevordering) is ook verkry en gebruik as aanduiding van werksukses. Deur die gebruik van Hotelling se T2 is bepaal dat die ecrsteorde profiele van suksesvolle en onsuksesvolle bewakingsdienslede beduidend van mekaar verskil. Daar is geen beduidende verskil ten opsigte van die tweedeorde profiele gevind nie. Deur middel van stapsgewyse diskriminantontleding, met persoonlikheid as onafhanklike en sukses (uitgedruk as 'n digotomie) as afhanklike veranderlike, is vier eersteorde faktore geidentifiseer en formules saamgestel wat 14,8 beter as toeval kan voorspel of "n persoon suksesvol of onsuksesvol volgens die digotomiese sukseskriterium sal wees.

scholarly journals Biological and Agrotechnical Aspects of Weed Control in the Cultivation of Early Potato Cultivars under Cover

Agriculture ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 373
Author(s):  
Piotr Pszczółkowski ◽  
Piotr Barbaś ◽  
Barbara Sawicka ◽  
Barbara Krochmal-Marczak
Keyword(s):  
Weed Management ◽  
Chemical Method ◽  
Potato Cultivars ◽  
Mechanical Method ◽  
Third Order ◽  
Chemical Methods ◽  
Weed Infestation ◽  
Order Factor ◽  
Cultivar Assessment ◽  
Early Harvest

Problems with weed infestation under cover were the reason to conduct research on the regulation of weed infestation in potato cultivation for early harvest. The field experiment was carried out in 2015–2017 at the Experimental Station for Cultivar Assessment in Uhnin (51°34′ N, 23°02′ E) using the method of random subblocks, in a dependent system (split-split-plot). The first order factor was edible potato cultivars ‘Denar’ and ‘Lord’. The second order factor was cultivation technologies: (A) traditional technology, (B) technology using polyethylene film cover, (C) technology using polypropylene agrotextile. The third order factor was weed management methods: (1) mechanical, (2) mechanical and chemical method using Afalon Dispersion 450 SC preparation, (3) mechanical and chemical methods using Racer 250 EC herbicide, and (4) mechanical and chemical methods using a mixture of herbicides Afalon Dispersion 450 SC and Command 480 EC. Mechanical and chemical methods proved to be more effective than the mechanical method. The best effectiveness in limiting both fresh and dry weed mass in potato cultivation under cover was achieved using the mechanical and chemical method using a mixture of herbicides, Afalon Dispersion 450 SC and Command 480 EC.

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