Seasonal changes in growth and nodulation of perennial tropical pasture legumes in the field. III. Effects of flowering on nodulation of three Desmodium species

1970 ◽  
Vol 21 (2) ◽  
pp. 215 ◽  
Author(s):  
PC Whiteman
Keyword(s):  
Regression Coefficient ◽  
General Trend ◽  
Dry Weight ◽  
Nodule Number ◽  
Nitrogen Yield ◽  
Stages Of Growth ◽  
Pasture Legumes ◽  
Type D ◽  
The Relationship ◽  
Stem Leaf

Changes in plant dry weight, leaf weight, nodule weight per plant, nodule number and size, and nitrogen content of stem, leaf, and nodules were followed throughout the growing season in Desmodium sandwicense an indeterminate flowering type, D. uncinatum which flowers in April, and D. intortum which flowers in late May. The seasonal build-up and decline of the nodule population was not related to the onset of flowering, peak nodulation occurring 3 months before flowering in D. intortum and 1 month before in D. uncinatum. D. sandwicense had three flowering periods, with some loss of nodules after flowering, but in its general trend of build-up and decline was similar to the other species. Changes in nodule weight per plant were a function mainly of changes in nodule number. The relationship between loglo nitrogen yield per plant and nodule weight per plant was similar for the three species at early samplings, but at later samplings the nitrogen yield did not increase linearly with increases in nodule weight. Thus the regression coefficient could not be taken as a constant index of nitrogen-fixing efficiency for a species at all stages of growth.

Seasonal changes in growth and nodulation of perennial tropical pasture legumes in the field. I. The influence of planting date and grazing and cutting on Desmodium uncinatum and Phaseolus atropurpureus

1970 ◽  
Vol 21 (2) ◽  
pp. 195 ◽  
Author(s):  
PC Whiteman ◽  
A Lulhan
Keyword(s):  
Dry Matter ◽  
Dry Weight ◽  
Planting Date ◽  
Rapid Decline ◽  
Individual Plant ◽  
Dry Matter Yield ◽  
Nodule Number ◽  
Pasture Legumes ◽  
Three Samples ◽  
Made In

Plantings of D. uncinatum and P. atropuvpureus were made in October and December 1965 and February and April 1966, and subsequently the plots were either rotationally grazed by sheep, cut with a mower at 3 inches, or left undefoliated. Monthly samples were taken to determine individual plant dry weight, nodule weight per plant, nodule number, and mean weight per nodule. Three samples for plot dry matter yield were also taken. Individual plant dry weight was higher in the October and December sowings, although by the end of the second growing season dry matter yield per plot was higher in the December and February sowings. Dry matter yield of legume was depressed by April planting. D. uncinatum began regrowth in spring 2 months earlier than P, atropurpureus, when minimum temperatures exceeded 48-50�F compared with 57' for P. atropurpureus. Both species had marked seasonal peaks in nodule and plant dry weight. The rapid decline in nodule weight could not be directly related to the onset of flowering or frosts. Grazing caused a greater reduction than cutting in terms of plant and nodule weight and legume yield. In P. atropurpureus nodule weight per plant was reduced through a decline in mean weight per nodule, while in D. uncinatum grazing and cutting reduced nodule number per plant.

Polysaccharides of tropical pasture herbage. III. The distribution of the major polysaccharide components of Townsville lucerne (Stylosanthes humilis) during growth

1971 ◽  
Vol 24 (5) ◽  
pp. 1041 ◽  
Author(s):  
CP Way ◽  
GN Richards
Keyword(s):  
Gas Chromatography ◽  
Medicago Sativa ◽  
Monosaccharide Composition ◽  
Tropical Pasture ◽  
Stages Of Growth ◽  
Pasture Legumes ◽  
Pectic Substances ◽  
Stylosanthes Humilis ◽  
Stem Leaf ◽  
Pasture Legume

Stylosanthes humilis, the predominant pasture legume in North Queensland, has been collected at three different stages of growth, viz. flowering, seeded, and senescence. The plants have been divided into stem, leaf, root, seed, and pod and each fraction has been analysed for the following types of polysaccharide components: water- solubles, pectic substances, hemicelluloses, and cellulose. The absolute monosaccharide composition of each of these fractions has been determined by hydrolysis and gas chromatography. Most of the polysaccharide components are similar in nature to those previously found in temperate pasture legumes (e.g. Medicago sativa), but the seeds are unusual among legumes in containing no galactomannan and there is evidence of the presence of a glucomannan in all parts of the plant.

Bradyrhizobium japonicum mutants allowing improved nodulation and nitrogen fixation of field-grown soybean in a short season area

2002 ◽  
Vol 138 (3) ◽  
pp. 293-300 ◽  
Author(s):  
H. ZHANG ◽  
F. DAOUST ◽  
T. C. CHARLES ◽  
B. T. DRISCOLL ◽  
B. PRITHIVIRAJ ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Total Nitrogen ◽  
Bradyrhizobium Japonicum ◽  
Dry Weight ◽  
Growth And Yield ◽  
Research Centre ◽  
Soybean Production ◽  
Nodule Number ◽  
Nitrogen Yield ◽  
Short Season

In short-season soybean production areas, low soil temperature is potentially a major factor limiting plant growth and yield. Although Bradyrhizobium japonicum strain 532 C is widely used in inoculants in Canadian soybean production, and USDA 110 is widely used in American soybean production, they are both inhibited by low temperatures. Genistein is an important plant-to-bacteria signal compound secreted by soybean roots. The addition of genistein has proven to be an effective means of generating increases in nitrogen fixation and yield but genistein is expensive. We used UV mutagenesis to make 10 mutants from USDA 110 that express nod genes without the addition of plant-to-bacteria signal compounds such as genistein. A field experiment was conducted at the Lods Agronomy Research Centre in southwestern Quebec in 1998 and 1999. The treatments consisted of factorial combinations of inoculant type (no inoculant (control) and inoculants containing the mutants Bj 30050, Bj 30051, Bj 30052, Bj 30053, Bj 30054, Bj 30055, Bj 30056, Bj 30057, Bj 30058, Bj 30059 and the wild type USDA110 or 532 C) and soybean cultivar (Bayfield and Maple Glen). The experiment was structured following a randomized complete block design with four blocks. Data were collected on nodule number, nodule dry weight, shoot nitrogen yield and total nitrogen fixation at five development stages. Averaged over the 2 years of the study, when pods were 2 cm long at one of the four uppermost nodes on the main stem (R4), inoculation with Bj 30055 and Bj 30058 resulted in greater nodule number (23 and 14%, respectively), nodule dry weight (16 and 13%, respectively), shoot nitrogen yield (19 and 21%, respectively) and total nitrogen fixation (10·9 and 12·7%, respectively) than 532 C, which is currently used in Canadian inoculants. The cultivar Bayfield produced more nodules, and higher nodule weight than Maple Glen, but there were no differences between the cultivars for shoot nitrogen yield and total nitrogen fixation.

Income or Culture? Examining the Determinants of Subjective Wellbeing in an International Sample

2019 ◽  
Author(s):  
Siddharth Garg
Keyword(s):  
Online Survey ◽  
Subjective Wellbeing ◽  
Regression Coefficient ◽  
Marginal Utility ◽  
Economic Class ◽  
Income Groups ◽  
Significant Difference ◽  
The World ◽  
Diminishing Marginal Utility ◽  
The Relationship

Objective: The aim of this paper was to examine the relationship between income, subjective wellbeing, and culture among people from a higher socio-economic class across the world. Rationale: Ed Diener proposed the law of diminishing marginal utility as an explanation for differences in subjective wellbeing among different income groups across different countries (Diener, Ng, & Tov, Balance in life and declining marginal utility of diverse resources, 2009). Thus, people with higher incomes would experience less subjective wellbeing due to income, and culture should emerge as a significant predictor. Method: Data from this study came from another study (https://siddharthgargblog.wordpress.com/2019/07/14/love-for-money/). I used an online survey to collect data on annual income in US dollars, subjective wellbeing (WHO-5), and country of residence (Indicator of Culture). 96 responses (Indians = 24, Foreigners = 72) were entered in IBM SPSS and a regression analysis was conducted. The raw dataset used in this study can be found at https://doi.org/10.6084/m9.figshare.8869040.v1Results: ANOVA showed a significant difference (p < 0.05) between Indians and foreigners on levels of subjective wellbeing. Linear regression shows the regression coefficient of culture to be significant (Beta = -.254, p = .014) but the regression coefficient of income was not found to be significant. The overall model was found to explain 8.2% of the variance in wellbeing.Conclusion: The sample of this study is too small to make any kind of generalization; it does lend a little bit of support to the idea of diminishing marginal utility of income on subjective wellbeing and provides a rationale for further research.

scholarly journals Be Aware of Burnout! The Role of Changes in Academic Burnout in Problematic Facebook Usage among University Students

2021 ◽  
Vol 18 (15) ◽  
pp. 8055
Author(s):  
Katarzyna Tomaszek ◽  
Agnieszka Muchacka-Cymerman
Keyword(s):  
Regression Coefficient ◽  
Population Sample ◽  
Cross Sectional ◽  
Academic Burnout ◽  
Independent Variables ◽  
Social Motive ◽  
Explained Variance ◽  
The Impact ◽  
The Relationship

Most previous research has examined the relationship between FB addiction and burnout level by conducting cross-sectional studies. Little is known about the impact of changes in burnout on FB addiction in an educational context. Through a two-way longitudinal survey of a student population sample (N = 115), this study examined the influence of changes in academic burnout over time and FB motives and importance (measured at the beginning and the end of the semester) on FB intrusion measured at the end of the academic semester. The findings show that: (1) increases in cynicism and in FB motives and importance significantly predicted time2 FB intrusion; (2) FB importance enhanced the prediction power of changes in the academic burnout total score, exhaustion and personal inefficacy, and reduced the regression coefficient of changes in cynicism; (3) the interaction effects between FB social motive use and changes in academic burnout, as well as between FB importance and personal inefficacy and exhaustion, accounted for a significant change in the explained variance of time2 FB intrusion. About 20–30% of the variance in time2 FB intrusion was explained by all the examined variables and by the interactions between them. The results suggest that changes in academic burnout and FB motives and importance are suppressive variables, as including these variables in the regression model all together changed the significance of the relationship between independent variables and FB intrusion.

The relationship between childhood trauma and type D personality in university students

2016 ◽  
Vol 62 (6) ◽  
pp. 542-548 ◽  
Author(s):  
Kadir Demirci ◽  
Mesut Yıldız ◽  
Cansu Selvi ◽  
Abdullah Akpınar
Keyword(s):  
University Students ◽  
Childhood Trauma ◽  
Type D Personality ◽  
Type D ◽  
The Relationship

scholarly journals Does Respect Foster Tolerance? (Re)analyzing and Synthesizing Data From a Large Research Project Using Meta-Analytic Techniques

2021 ◽  
pp. 014616722110244
Author(s):  
Steffen Zitzmann ◽  
Lukas Loreth ◽  
Klaus Michael Reininger ◽  
Bernd Simon
Keyword(s):  
Regression Coefficient ◽  
Theory Development ◽  
High Status ◽  
Social Psychological ◽  
Way Of Life ◽  
Research Project ◽  
The Social ◽  
The Relationship ◽  
Large Research ◽  
Existing Data

Our own prior research has demonstrated that respect for disapproved others predicts and might foster tolerance toward them. This means that without giving up their disapproval of others’ way of life, people can tolerate others when they respect them as equals (outgroup respect–tolerance hypothesis). Still, there was considerable variation in the study features. Moreover, the studies are part of a larger research project that affords many additional tests of our hypothesis. To achieve integration along with a more robust understanding of the relation between respect and tolerance, we (re)analyzed all existing data from this project, and we synthesized the results with the help of meta-analytic techniques. The average standardized regression coefficient, which describes the relationship between respect and tolerance, was 0.25 (95% confidence interval [CI] = [0.16, 0.34]). In addition to this overall confirmation of our hypothesis, the size of this coefficient varied with a number of variables. It was larger for numerical majorities than for minorities, smaller for high-status than for low-status groups, and larger for religious than for life-style groups. These findings should inspire further theory development and spur growth in the social-psychological literature on tolerance.

scholarly journals Investigating the Relationship between Professionalism and (Technical, Human, and Perceptual) Skills of Managers in Poly Akril Company of Iran from Experts’ Viewpoint

2016 ◽  
Vol 6 (2) ◽  
pp. 117
Author(s):  
Marzie Ghanbari ◽  
Reza Hoveida ◽  
Seyed Ali Siadat
Keyword(s):  
Data Collection ◽  
Random Sampling ◽  
Sampling Method ◽  
Regression Coefficient ◽  
Reliability Coefficient ◽  
Descriptive Statistics ◽  
Stratified Random Sampling ◽  
Perceptual Skills ◽  
The Relationship ◽  
Test Correlation

The objective of the present study is to investigate the relationship between managers’ professionalism and (technical, human, and perceptual) skills in managers of Iran Poly Akril Company. The research is an applied one in terms of objectives, and a descriptive-correlational in terms of method. The population includes all experts working in the company in 2012 as 240 individuals among who 144 participants were selected using the stratified random sampling method proportionate to the population size as the sample size. The data collection instruments were two researcher-made questionnaires of Managers’ skills containing 22 items and with the reliability coefficient as 0.96, and Professionalism containing 28 items and the reliability coefficient as 0.95. Their validity was investigated and confirmed by professors and experts of management. Analyzing data was conducted at the two level of descriptive statistics (frequency, mean, SD, and presentation of tables and charts) and inferential statistics (one sample t-test, correlation coefficient, regression coefficient, ANOVA, and F-test).

Cold tolerance of the Antarctic springtail Gomphiocephalus hodgsoni (Collembola, Hypogastruridae)

2001 ◽  
Vol 13 (3) ◽  
pp. 271-279 ◽  
Author(s):  
Brent J. Sinclair ◽  
Heidi Sjursen
Keyword(s):  
Cold Tolerance ◽  
Thermal Environment ◽  
Strong Relationship ◽  
Dry Weight ◽  
Glycerol Content ◽  
Recrystallization Inhibition ◽  
Low Levels ◽  
Inhibition Studies ◽  
The Antarctic ◽  
The Relationship

Cold tolerance of the springtail Gomphiocephalus hodgsoni Carpenter (Collembola: Hypogastruridae) was studied at Cape Bird, Ross Island, Antarctica (77°13′S, 166°26′E). Microclimate temperatures indicate a highly seasonal thermal environment, with winter minima <–39°C. Snow cover significantly buffers both minimum temperatures and cooling rates. Gomphiocephalus hodgsoni survives low temperatures by avoiding freezing. Mean low group supercooling points (SCPs) ranged from –35.4°C in October to –28.3°C in January. The lowest SCP measured was –38.0°C. The high SCP group was very small, making up only 18% of the population in January. In October, G. hodgsoni had a very high glycerol content (>80 μg mg−1 dry weight), although this declined rapidly to low levels (c. 7–10 μg mg−1 dry weight) in January. Quantities of glucose and trehalose were low during October, but steadily increased throughout the summer. Haemolymph osmolality was exceptionally high (up to 1755 mOsm kg−1) at the end of November, but this rapidly declined to c. 500 mOsm kg−1 by late December. The presence of thermal hystersis proteins was indicated by both osmometry on haemolymph samples and recrystallization inhibition studies of springtail homogenates. There was a strong relationship between glycerol content and SCP, but the relationship between haemolymph osmolality, SCP and carbohydrates is uncertain.

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