scholarly journals The Key Role of Variety and Method of Sowing Selection in Pea Roots’ Parameters Development under Sustainable Practice

2019 ◽  
Vol 11 (7) ◽  
pp. 1824 ◽  
Author(s):  
Agnieszka Klimek-Kopyra ◽  
Tomasz Głąb ◽  
Jacek Strojny
Keyword(s):  
Regression Model ◽  
Mass Density ◽  
Specific Root Length ◽  
Dry Mass ◽  
Root Surface ◽  
Ordinal Regression ◽  
Root Surface Area ◽  
Row Spacing ◽  
Root Parameters ◽  
Ordinal Regression Model

The selection of varieties is extremely important for decreasing fertilizer consumption. However, little attention is devoted to assessing the effectiveness of row spacing in tandem with types of varieties of pea on root development in the context of limited nutrition. As essential knowledge in this area is lacking, a study was conducted with two objectives using an ordinal regression model. (i): To determine whether qualitative variables (cultivar, fertilization, and row spacing) or quantitative variables (root parameters) affect the root dry mass density, and (ii): To assess the variation in root architecture of two pea cultivars (fodder vs. edible type) grown under different P supply levels (0, 45, and 90 kg P2O5) and row spacing (narrow—15 cm—and wide—30 cm). The ordinal regression model showed that row spacing and cultivar type are meaningful predictors of root dry mass density (RDMD). The root dry mass density increased at wider row spacing in the fodder pea cultivar. As root surface area density (RSAD) and SRL-specific root length (SRL) most accurately describe root mass, it was concluded that the cultivar type and row spacing are crucial factors for increasing root plasticity, which can improve soil utilization.

scholarly journals Ordinal regression model for pea seed mass

2017 ◽  
Vol 68 (2) ◽  
pp. 81-87 ◽  
Author(s):  
Agnieszka Klimek-Kopyra ◽  
Jacek Strojny ◽  
Tadeusz Zając ◽  
Anna Ślizowska ◽  
Jana Klimešova ◽  
...  
Keyword(s):  
Regression Model ◽  
Mass Production ◽  
Seed Mass ◽  
Dry Mass ◽  
Ordinal Regression ◽  
Plant Seeds ◽  
Qualitative Variables ◽  
Ordinal Regression Model ◽  
Model Year ◽  
Pea Seed

Summary The development of seeds at various positions in the pod is asynchronous. Thus, the differences of seed dry mass production because of environmental conditions may depend on the cultivar type, type of inoculants and interrelations between seeds per pod, pods per plant or seeds per plant. Presently, a mathematical description of pea seed categorisation is missing. The aim of the study was the assessment of two groups of variables (quantitative and qualitative) for pea seed weight categorisation by ordinal regression model. Year, cultivar and inoculant constituted the first group (qualitative variables), whilst seeds per pod, the pods per plant and seeds per plant (quantitative variables) were entered as covariates in the ordinal regression model. According to the ordinal regression model variables, seeds per pod, pods per plant, seeds per plant, year and cultivar are meaningful predictors of the seed mass categories. However, the variable inoculant is marginally significant.

scholarly journals Effects of Soil Decompaction and Amendment on Root Growth and Architecture in Red Maple ( Acer rubrum)

2007 ◽  
Vol 33 (6) ◽  
pp. 428-432
Author(s):  
William Hascher ◽  
Christina Wells
Keyword(s):  
Root Growth ◽  
Surface Area ◽  
Mass Density ◽  
Acer Rubrum ◽  
Root Surface ◽  
Root Diameter ◽  
Diameter Distribution ◽  
Root Surface Area ◽  
Red Maple ◽  
Root Parameters

The Terravent TMsoil injection device (Pinnacle Concepts, Ltd., Cornwall, UK) uses compressed nitrogen gas to fracture compacted soil and permits the subsequent injection of liquid amendments. In the current study, we measured fine root growth and architecture in soil that had received one of four treatments: 1) Terravent injections, 2) Terravent injections followed by liquid amendment (MycorTree® Injectable; PHC, Inc., Pittsburgh, PA, U.S.), 3) addition of amendment only, and 4) an untreated control. The experiment was conducted on ten red maples (Acer rubrum) growing on a moderately compacted urban clay soil next to a busy road on the Clemson University campus. Treatments were applied in April 2002. Seven weeks later, soil cores were pulled from locations adjacent to the injection sites, and fine roots (less than 2 mm [0.08 in] in diameter) from each core were washed free of soil. A variety of root parameters were measured, including length, surface area, diameter distribution, and mass. Terravent treatment had no effect on any root parameters measured. Application of MycorTree was associated with small, statistically significant reductions in root diameter, root mass density (mg root/cm 3soil), and root surface area density (cm 2root/cm 3soil).

scholarly journals Individual and Interactive Temporal Implications of UV-B Radiation and Elevated CO2 on the Morphology of Basil (Ocimum basilicum L.)

Horticulturae ◽  
2021 ◽  
Vol 7 (11) ◽  
pp. 474
Author(s):  
T. Casey Barickman ◽  
Skyler Brazel ◽  
Akanksha Sehgal ◽  
C. Hunt Walne ◽  
Wei Gao ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Plant Morphology ◽  
Dry Mass ◽  
Root Surface ◽  
Morphological Features ◽  
Fresh Mass ◽  
Interactive Effects ◽  
Root Surface Area ◽  
Surface Wax ◽  
Radiation Treatments

Temporal and spatial variations in ozone levels and temporal changes in solar radiation greatly influence ultraviolet radiation incidence to crops throughout their growth, yet the interactive effects of CO2 and UV-B radiation on Basil production under sunlight environmental conditions has not been studied. Basil ‘Genovese’ plants grown under sunlit plant growth chambers were subjected to a combination of supplemental UV-B (0 and 10 kJ m−2d−1) and ambient (420 ppm) and elevated (720 ppm) CO2 treatments for 38 days after 14 days of germination. UV-B radiation treatments caused a decrease in basil stem branching, fresh mass, and stem dry mass under both CO2 treatments when harvested after 17 and 38 days of treatment. There was also an increase in basil leaf surface wax under UV-B (10 kJ m−2d−1) treatment compared to controls (0 kJ m−2d−1). Elevated CO2 treatments caused a decrease in morphological features, including specific leaf area and fresh mass. Interactive effects between UV-B and CO2 treatments existed for some morphological features, including plant height, root surface area, and average root diameter. Understanding the impacts that CO2 and UV-B radiation treatments have on basilcan improve existing varieties for increased tolerance while simultaneously improving yield, plant morphology, and physiology.

Ordinal regression model and the linear regression model were superior to the logistic regression models

2006 ◽  
Vol 59 (5) ◽  
pp. 448-456 ◽  
Author(s):  
Colleen M. Norris ◽  
William A. Ghali ◽  
L. Duncan Saunders ◽  
Rollin Brant ◽  
Diane Galbraith ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Linear Regression ◽  
Regression Model ◽  
Linear Regression Model ◽  
Regression Models ◽  
Ordinal Regression ◽  
Logistic Regression Models ◽  
Ordinal Regression Model

scholarly journals ORDINAL REGRESSION FOR MODELLING THE FAMILY WELL-BEING AMONG THE MALAYSIANS

2021 ◽  
Vol 6 (2) ◽  
pp. 424-447
Author(s):  
Noor Azlin Muhammad Sapri ◽  
Kamarulzaman Ibrahim ◽  
Mohd Aftar Abu Bakar ◽  
Noratiqah Mohd Ariff
Keyword(s):  
Regression Model ◽  
Ordinal Data ◽  
Family Relationship ◽  
Well Being ◽  
Religious Practice ◽  
Ordinal Regression ◽  
Social Characteristics ◽  
The Family ◽  
The Status ◽  
Ordinal Regression Model

Background and Purpose: Understanding factors which affect the level of family well-being is important as it contributes to effective decision making among the policymakers to improve the family lives as well as to strengthen the family institution. Accordingly, this line of research is gaining attention. This study develops an ordinal regression model which identifies demographic, economic and social factors that are significant in explaining the status of family well-being.    Methodology: Data involving 2,808 respondents from a nationwide survey conducted by the National Population and Family Development Board of Malaysia in 2011 were used in this study. Ordinal regression model was implemented to describe the three levels of family well-being.   Findings: The national survey reported that high level of family well-being was experienced by 76.3 per cent of the respondents, followed by moderate (18.4%) and low (5.3%). The fitted ordinal regression model found that ethnic background, family relationship, community relationship, health and safety levels, economic situation of the family, religious practice, housing, and environment are significantly related to family well-being. Meanwhile, it was found that the level of income is not a significant factor in determining the level of family well-being.     Contributions: There are a limited number of studies on the application of ordinal regression for modelling the level of family well-being, particularly with covariates involving the demographic and social characteristics of the respondents. This study fills in the gap in the literature where the ordinal regression model provides useful information for policymakers to enhance the status of family well-being in Malaysia via various policy initiatives.   Keywords: Family well-being, Ordinal Regression Model, ordinal data, Proportional Odds Model.   Cite as: Muhammad Sapri, N. A., Ibrahim, K., Abu Bakar, M. A., & Mohd Ariff, N. (2021). Ordinal regression for modelling the family well-being among the Malaysians.  Journal of Nusantara Studies, 6(2), 424-447. http://dx.doi.org/10.24200/jonus.vol6iss2pp424-447

scholarly journals Growth, Physiological, and Photosynthetic Responses of Xanthoceras sorbifolium Bunge Seedlings Under Various Degrees of Salinity

2021 ◽  
Vol 12 ◽  
Author(s):  
Jian-Wei Zong ◽  
Zhi-Long Zhang ◽  
Pei-Lu Huang ◽  
Nai-Yu Chen ◽  
Ke-Xin Xue ◽  
...  
Keyword(s):  
Root Morphology ◽  
Nacl Stress ◽  
Root Surface ◽  
Root Surface Area ◽  
Saline Stress ◽  
Photosynthetic Parameters ◽  
Root Tips ◽  
Sod Activity ◽  
Root Parameters ◽  
Xanthoceras Sorbifolium

Xanthoceras sorbifolium Bunge is priced for its medical and energetic values. The species also plays a key role in stabilizing ecologically fragile areas exposed to excess soil salinity. In this study, the effects of salinity on the growth, physiological, and photosynthetic parameters of X. sorbifolium Bunge were investigated. The X. sorbifolium seedlings were subjected to five salt treatments: 0 (control, CK), 70, 140, 210, and 280 mM of sodium chloride (NaCl) solutions. NaCl caused a decrease in plant height, specific leaf area, biomass, and root parameters. Leaf wilting and shedding and changes in root morphology, such as root length, root surface area, and root tips were observed. This study found that X. sorbifolium is tolerant to high salinity. Compared with the CK group, even if the concentration of NaCl was higher than 210 mM, the increase of the relative conductivity was also slow, while intercellular CO2 concentration had a similar trend. Moreover, NaCl stress caused an increase in the malondialdehyde (MDA), soluble proteins, and proline. Among the enzymes in the plant, the catalase (CAT) activity increases first and decreased with the increase in the intensity of NaCl stress, but the salt treatment had no significant effect on superoxide dismutase (SOD) activity. The peroxidase (POD) showed an increasing trend under salt stress. It was found that the photosynthesis of X. sorbifolium was notably impacted by saline stress. NaCl toxicity induced a noticeable influence on leaf net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), transpiration rate (E), and water use efficiency (Wue). As salt concentration increased, the content of chlorophyll decreased. It can be found that a low concentration of NaCl induced the increase of photosynthetic capacity but a high-intensity exposure to stress resulted in the reduction of photosynthetic efficiency and SOD activity, which had a positive correlation. In summary, salt-induced ionic stress primarily controlled root morphology, osmotic adjustment, and enzyme activities of salt-treated X. sorbifolium leaves, whereas the low salt load could, in fact, promote the growth of roots.

Abstract P442: The Association of Amyloid and Tau Burden With Centrum Semiovale Perivascular Spaces in Cerebral Amyloid Angiopathy

Stroke ◽  
2021 ◽  
Vol 52 (Suppl_1) ◽  
Author(s):  
Elif Gokcal ◽  
Alex A Becker ◽  
Mitchell J Horn ◽  
Alvin S Das ◽  
Kristin Schwab ◽  
...  
Keyword(s):  
Regression Model ◽  
Cerebral Amyloid Angiopathy ◽  
Structural Mri ◽  
Ordinal Regression ◽  
White Matter Hyperintensity ◽  
Amyloid Angiopathy ◽  
Perivascular Spaces ◽  
Centrum Semiovale ◽  
Ordinal Regression Model ◽  
Cerebral Amyloid

Background: The mechanisms linking cerebral amyloid angiopathy (CAA) to enlarged perivascular spaces in centrum semiovale (CSO-EPVS) and whether other Alzheimer’s Disease (AD) pathologies might affect CSO-EPVS are unclear. We hypothesized that amyloid but not tau load would independently correlate with CSO-EPVS in CAA. Methods: Fifty prospectively enrolled nondemented probable CAA patients underwent high-resolution structural MRI, Pittsburgh compound B (PiB, for amyloid), and 18 F-flortaucipir (FTP, for tau) PET imaging. Microbleeds (all lobar, LMB) were counted and white matter hyperintensity volume (WMH) was quantified. CSO-EPVS were counted on T 2 -MRI sequence and graded using a previously validated scale (range 0-4). A multivariate ordinal regression model was used to assess the independent associations between CSO-EPVS and mean cortical amyloid as well as tau deposition, after adjusting for relevant covariates. Results: Patients had a mean age of 69.3±7.2. Age, sex, presence of hypertension, intracerebral hemorrhage (ICH), LMB counts, and WMH were not associated with CSO-EPVS grades (p>0.2 for all comparisons). Higher PiB uptake significantly correlated with increased CSO-EPVS (rho=0.45, p=0.001). Higher FTP showed a trend for correlation with CSO-EPVS (rho=0.26, p=0.069). In an ordinal regression model with CSO-EPVS grade as the dependent variable and both amyloid and tau levels included as predictors along with covariates presented above, the association of CSO-EPVS remained significant with higher PiB uptake (β=3.97, 95%CI 1.1-6.8, p=0.007) but not with FTP uptake (p=0.167). Conclusion: Results of this study suggest that CSO-EPVS is independently associated with amyloid but not with tau deposition in CAA. CSO-EPVS was not associated with age or classical vascular risk factors or presence of ICH. Our results support the view that vascular amyloid but not other AD pathologies such as tau might contribute to EPVS in patients with CAA.

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