Performance of North American and Australian lucernes in the Queensland subtropics 2. Yield and plant survival in irrigated stands

1985 ◽  
Vol 25 (1) ◽  
pp. 82 ◽  
Author(s):  
KF Lowe ◽  
D Gramshaw ◽  
TM Bowdler ◽  
DH Ludke
Keyword(s):  
Multiple Regression ◽  
North American ◽  
Root Rot ◽  
Winter Dormancy ◽  
Regression Analyses ◽  
Plant Survival ◽  
Phytophthora Root Rot ◽  
Highly Correlated

The yield and plant survival of 23 North American and 5 Australian lucerne lines were assessed at Biloela and Gatton, Queensland, under irrigation over a 40-month period. Total yields ranged from 49 to 72 t/ha at Biloela and from 14 to 47 t/ha at Gatton. The relative performances of lines were similar at each site. The highly winter non-dormant lines were the highest yielding, particularly HS Gen 3 Composite, Matador and CUF 10 1. Semi-dormant lines were generally more productive than nondormant and dormant lines, with Pioneer 581, Falkiner and DeKalb 167 the most productive. Multiple regression analyses showed lucerne yield at both sites to be highly correlated with relative winter dormancy and plant survival. At Gatton, population at establishment, winter dormancy and disease ratings for Phytophthora root rot and anthracnose all influenced survival of lucerne plants, whilst at Biloela establishment population was the only significant factor. The potential commercial impact of lines with reduced winter dormancy and improved resistance to root rot and anthracnose in irrigated stands in south-east Queensland is discussed.

Three Studies of Deficits in Pantomimic Expression and Pantomimic Recognition in Aphasia

1981 ◽  
Vol 24 (1) ◽  
pp. 70-84 ◽  
Author(s):  
Robert J. Duffy ◽  
Joseph R. Duffy
Keyword(s):  
Multiple Regression ◽  
Right Hemisphere ◽  
Zero Order ◽  
Regression Analyses ◽  
Nonverbal Behaviors ◽  
Partial Correlations ◽  
Highly Correlated ◽  
Intellectual Deficit ◽  
Causal Theories ◽  
The Relationship

Studies were conducted to investigate aphasic deficits in pantomimic behaviors. Three groups of subjects were used: 47 aphasics; 27 right-hemisphere-damaged; and 11 controls. Study I replicates a previous study of pantomimic recognition deficits (Duffy, Duffy, & Pearson, 1975) and essentially duplicates the previous findings of significant deficits of pantomimic recognition in aphasic subjects that are highly correlated with their verbal deficits. Study II examines the relationship between deficits in pantomimic recognition and expression; and the relationships between these two nonverbal behaviors mad aphasic verbal deficits. Zero order correlations, partial correlations, and multiple regression analyses are presented. The results show that aphasics exhibit significant deficits in both pantomimic expression and recognition; and, that both of these are highly correlated with aphasic verbal deficits. Study III is an investigation of tour causal theories of aphasic deficits in pantomimic expression. Zero order correlations, partial correlations, and multiple regression analyses are presented. It is concluded that aphasic pantomimic expressive deficits are not caused by general intellectual deficit or limb apraxia; but, they are associated with a central symbolic disorder or a verbal mediation deficit. The implications of these studies for an understanding of the nature of aphasia as a syndrome which includes both verbal and nonverbal impairments are discussed.

Performance of North American and Australian lucernes in the Queensland subtropics. 3. Yield, plant survival and aphid populations in raingrown stands

1985 ◽  
Vol 25 (1) ◽  
pp. 91 ◽  
Author(s):  
DL Lloyd ◽  
D Gramshaw ◽  
TB Hilder ◽  
DH Ludke ◽  
JW Turner
Keyword(s):  
North American ◽  
Dry Matter ◽  
Population Decline ◽  
Arid Environment ◽  
Dry Matter Yield ◽  
Plant Survival ◽  
Phytophthora Root Rot ◽  
Large Populations ◽  
Plant Persistence ◽  
Dry Conditions

Twenty-three North American and up to five Australian lucerne lines were evaluated for dry matter yield, plant persistence and aphid resistance at three sites under raingrown conditions in southern Queensland. The experiment at Toowoomba was conducted over 3 years, but those at Mitchell and Biloela were terminated after 1 and 2 years, respectively, because of poor plant survival caused partly by dry conditions. In the subhumid environments at Toowoomba and Biloela, lucerne yield was strongly associated with lucerne population decline. At Toowomba, where there was least confounding with nonordered variation, yield was also positively associated with decreasing winter dormancy. There, persistence (and therefore yield) was associated with resistance to both anthracnose and Phytophthora root rot. No line possessed high levels of combined resistance to these diseases. In the semi-arid environment at Mitchell, the highest yields were obtained from non-dormant lines. Root canker reduced lucerne yield at this site. Large populations of spotted alfalfa aphid developed on susceptible lines and of blue-green aphid on all lines. However, no effects on the dry matter yield or persistence of any lines were measured.

Interpret with Caution: Multicollinearity in Multiple Regression of Cognitive Data

2003 ◽  
Vol 97 (1) ◽  
pp. 80-82 ◽  
Author(s):  
Catriona M. Morrison
Keyword(s):  
Multiple Regression ◽  
Picture Naming ◽  
Age Of Acquisition ◽  
Naming Speed ◽  
Regression Analyses ◽  
Independent Variables ◽  
Highly Correlated ◽  
Cognitive Data

Shibihara and Kondo in 2002 reported a reanalysis of the 1997 Kanji picture-naming data of Yamazaki, Ellis, Morrison, and Lambon-Ralph in which independent variables were highly correlated. Their addition of the variable visual familiarity altered the previously reported pattern of results, indicating that visual familiarity, but not age of acquisition, was important in predicting Kanji naming speed. The present paper argues that caution should be taken when drawing conclusions from multiple regression analyses in which the independent variables are so highly correlated, as such multicollinearity can lead to unreliable output.

Language and Literacy Predictors of Dialect Density Among School-Age African American Children From Two Geographic Regions

2020 ◽  
Vol 51 (3) ◽  
pp. 807-820
Author(s):  
Lena G. Caesar ◽  
Marie Kerins
Keyword(s):  
African American ◽  
Multiple Regression ◽  
Oral Language ◽  
East Coast ◽  
Geographic Region ◽  
Literacy Skills ◽  
School Age ◽  
Regression Analyses ◽  
Geographic Regions ◽  
American Children

Purpose The purpose of this study was to investigate the relationship between oral language, literacy skills, age, and dialect density (DD) of African American children residing in two different geographical regions of the United States (East Coast and Midwest). Method Data were obtained from 64 African American school-age children between the ages of 7 and 12 years from two geographic regions. Children were assessed using a combination of standardized tests and narrative samples elicited from wordless picture books. Bivariate correlation and multiple regression analyses were used to determine relationships to and relative contributions of oral language, literacy, age, and geographic region to DD. Results Results of correlation analyses demonstrated a negative relationship between DD measures and children's literacy skills. Age-related findings between geographic regions indicated that the younger sample from the Midwest outscored the East Coast sample in reading comprehension and sentence complexity. Multiple regression analyses identified five variables (i.e., geographic region, age, mean length of utterance in morphemes, reading fluency, and phonological awareness) that accounted for 31% of the variance of children's DD—with geographic region emerging as the strongest predictor. Conclusions As in previous studies, the current study found an inverse relationship between DD and several literacy measures. Importantly, geographic region emerged as a strong predictor of DD. This finding highlights the need for a further study that goes beyond the mere description of relationships to comparing geographic regions and specifically focusing on racial composition, poverty, and school success measures through direct data collection.

scholarly journals Cellulase Activity as a Mechanism for Suppression of Phytophthora Root Rot in Mulches

2011 ◽  
Vol 101 (2) ◽  
pp. 223-230 ◽  
Author(s):  
Brantlee Spakes Richter ◽  
Kelly Ivors ◽  
Wei Shi ◽  
D. M. Benson
Keyword(s):  
Root Rot ◽  
Phytophthora Cinnamomi ◽  
Cellulase Activity ◽  
Enzyme Concentration ◽  
Disease Suppression ◽  
In Vitro Assays ◽  
Infested Soil ◽  
Phytophthora Root Rot ◽  
Standard Curve

Wood-based mulches are used in avocado production and are being tested on Fraser fir for reduction of Phytophthora root rot, caused by Phytophthora cinnamomi. Research with avocado has suggested a role of microbial cellulase enzymes in pathogen suppression through effects on the cellulosic cell walls of Phytophthora. This work was conducted to determine whether cellulase activity could account for disease suppression in mulch systems. A standard curve was developed to correlate cellulase activity in mulches with concentrations of a cellulase product. Based on this curve, cellulase activity in mulch samples was equivalent to a cellulase enzyme concentration of 25 U ml–1 or greater of product. Sustained exposure of P. cinnamomi to cellulase at 10 to 50 U ml–1 significantly reduced sporangia production, but biomass was only reduced with concentrations over 100 U ml–1. In a lupine bioassay, cellulase was applied to infested soil at 100 or 1,000 U ml–1 with three timings. Cellulase activity diminished by 47% between 1 and 15 days after application. Cellulase applied at 100 U ml–1 2 weeks before planting yielded activity of 20.08 μmol glucose equivalents per gram of soil water (GE g–1 aq) at planting, a level equivalent to mulch samples. Cellulase activity at planting ranged from 3.35 to 48.67 μmol GE g–1 aq, but no treatment significantly affected disease progress. Based on in vitro assays, cellulase activity in mulch was sufficient to impair sporangia production of P. cinnamomi, but not always sufficient to impact vegetative biomass.

THE EVALUATION OF SELF-MONITORING ATTRIBUTES

1991 ◽  
Vol 19 (3) ◽  
pp. 205-215 ◽  
Author(s):  
Arts Jiujias ◽  
Peter Horvath
Keyword(s):  
Regression Analysis ◽  
Multiple Regression Analysis ◽  
Multiple Regression ◽  
Regression Analyses ◽  
Self Monitoring

Eighty-six Canadian female undergraduates attributed self-monitoring traits to a target presented on videotape, and evaluated her in terms of liking. Attributed self-monitoring was negatively correlated with attraction to the target and was the only predictor of attraction in a multiple regression analysis. Multiple regression analyses with subscales of attributed self-monitoring as predictors suggested that the evaluations may be the result of the attributed unpredictability of the high self-monitoring prototype.

Phenotypic selection in a population of Crepis tectorum ssp. pumila (Asteraceae)

1992 ◽  
Vol 70 (1) ◽  
pp. 89-95 ◽  
Author(s):  
Stefan Andersson
Keyword(s):  
Life History ◽  
Multiple Regression ◽  
Large Scale ◽  
Demographic Data ◽  
Phenotypic Selection ◽  
Direct Selection ◽  
Surprising Result ◽  
Regression Analyses ◽  
Ecotypic Differentiation ◽  
Crepis Tectorum

A 3-year demographic study was conducted to reveal targets of selection on morphology and life history in a population of Crepis tectorum ssp. pumila, a winter annual plant confined to calcareous grasslands (alvars) on the Baltic island of Öland (south Sweden). I calculated the selection differential to describe the change in the mean value of a character due to selection and used multiple regression analyses to partition the direct effect of selection on the trait from indirect responses of selection on other traits. Rosette leaf number, a convenient measure of plant size, was strongly correlated with both viability and fertility (fitness). There was also a strong relationship between fitness and the extent to which the plants expressed traits characterizing this particular taxon. Multiple regression analyses indicated direct selection favouring plants with deeply lobed leaves and a densely branched stem, two distinctive traits of ssp. pumila believed to be adaptive in the alvar habitat. Only stem height was subject to both direct and indirect selection in the wrong direction; taller individuals were more successful than those with a shorter stem, a surprising result considering the inferred advantage of a short stature in the exposed alvar habitat. Selection on other traits assumed to be ecologically important (germination time, flowering time, and seed size) was found to be either absent or variable in direction when other traits were held constant. The failure of plants to survive to the flowering stage in the last two summers indicates strong selection for plants that produce a high percentage of dormant seeds. Overall, the contemporary selection regime as revealed by demographic data was only partly congruent with predictions regarding historical selection pressures based on large-scale patterns of variation (ecotypic differentiation). Key words: Crepis tectorum, ecotypic differentiation, life history, morphology, phenotypic selection.

Copying, Reading, and Writing of Kana and Simple Forms by Japanese Preschoolers

1988 ◽  
Vol 66 (2) ◽  
pp. 387-394
Author(s):  
Jun Yamada ◽  
Miyuki Sasaki ◽  
Naoko Motooka
Keyword(s):  
Multiple Regression ◽  
Good Predictor ◽  
Quality Measure ◽  
Writing Achievement ◽  
Regression Analyses ◽  
Reading And Writing ◽  
Conventional Form ◽  
Form Quality ◽  
Japanese Kana ◽  
Children's Reading

42 Japanese preschoolers were administered tasks of copying, reading, and writing of Japanese kana (cursive syllabic letters) and simple forms. Multiple regression analyses were used to determine whether two kana-copying measures, speed and span, make significant contributions to children's reading and writing achievement after a conventional form-quality measure had been controlled. Analysis showed that speed or span accounts uniquely for a significant and sizable amount of the variance of reading and writing, suggesting that kana-copying is a good predictor of reading and writing for Japanese preschoolers.

Relationship Between Spirituality and Distress in Ascetics

2021 ◽  
pp. 003329412110434
Author(s):  
Rudra B. Bhandari ◽  
Nidhi Chaudhry ◽  
Sarita Devi
Keyword(s):  
Multiple Regression ◽  
Negative Relationship ◽  
Spiritual Intelligence ◽  
Self Report ◽  
Regression Analyses ◽  
Psychosomatic Health ◽  
Spirituality And Health ◽  
Medical Index ◽  
The Relationship ◽  
Health Questionnaires

The relation between spirituality and health has been argued for decades. The study aimed to ascertain the extent and nature of the relationship between spirituality quantified in terms of Spiritual Intelligence (SI) and distress in ascetics. Sixty-three Hindu ascetics aged 31.3 ± 6.6 years were sampled from Patanjali Yogpeeth, India. Participants’ distress and spiritual levels were measured by using the Cornell Medical Index Health Questionnaires (CMHIQs) and Spiritual Intelligence Self-Report Inventory-24 (SISRI-24), respectively. Multiple regression analyses showed an insignificant negative relationship between SI and distress implying SI as a predictor of psychosomatic health.

Sign in / Sign up

Export Citation Format

Share Document