A quantitative review of the effects of biochar application to soils on crop productivity using meta-analysis

2011 ◽  
Vol 144 (1) ◽  
pp. 175-187 ◽  
Author(s):  
S. Jeffery ◽  
F.G.A. Verheijen ◽  
M. van der Velde ◽  
A.C. Bastos
Keyword(s):  
Meta Analysis ◽  
Crop Productivity ◽  
Quantitative Review

A preliminary systematic review and meta-analysis on the effects of heart rate variability biofeedback on heart rate variability and respiration of athletes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jeffrey Cayaban Pagaduan ◽  
Yung-Sheng Chen ◽  
James William Fell ◽  
Sam Shi Xuan Wu
Keyword(s):  
Systematic Review ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Web Of Science ◽  
Meta Analysis ◽  
Academic Research ◽  
Experimental Studies ◽  
Quantitative Review ◽  
Heart Rate Variability Biofeedback ◽  
Randomized Control

Abstract To date, there is no quantitative review examining the influence of heart rate variability biofeedback (HRV BFB) on the athlete population. Such an undertaking may provide valuable information on the autonomic and respiration responses of athletes when performing HRV BFB. Thus, purpose of this preliminary systematic review and meta-analysis on the effects of HRV BFB on HRV and respiration of athletes. Searches of Springerlink, SportDiscus, Web of Science, PROQUEST Academic Research Library, Google Scholar, and ScienceDirect were conducted for studies that met the following criteria: (1) experimental studies involving athletes that underwent randomized control trial; (2) availability of HRV BFB as a treatment compared with a control (CON)/placebo (PLA); (3) any pre and post HRV variable and/or breathing frequency as dependent variable/s; and, (4) peer-reviewed articles written in English. Four out of 660 studies involving 115 athletes (25 females and 90 males) ages 16–30 years old were assessed in this review. Preliminary findings suggest the promising ability of HRV BFB to improve respiratory mechanics in athlete population. More work is needed to determine the autonomic modulatory effect of HRV BFB in athletes.

scholarly journals Complementary Meta-Analytic Methods for the Quantitative Review of Research: 2. An Extended Illustration

2013 ◽  
Vol 4 (2) ◽  
pp. 46 ◽  
Author(s):  
Aurelio José Figueredo ◽  
Candace Jasmine Black ◽  
Anne Grete Scott
Keyword(s):  
Higher Education ◽  
Meta Analysis ◽  
Analytic Method ◽  
Quantitative Review ◽  
Analytic Methods ◽  
Retention In Higher Education

In Figueredo, Black, and Scott (this issue), we presented the rationale for a complementary meta-analytic method to accompany traditional effects meta-analytic procedures.  Here, we provide an example using Contents Meta-Analysis so that readers can become familiar with the application of the method and the implications of its use.  This illustration will be presented in two major sections.  First, we will describe an empirical example of a meta-analysis on retention in higher education where a Contents Meta-Analysis was conducted.  Then we will show how the information gained in the Contents Meta-Analysis may be applied to address issues of generalizability. DOI:10.2458/azu_jmmss_v4i2_figueredo

Influence of Poultry Litter on Crop Productivity under Different Field Conditions: A Meta-Analysis

2018 ◽  
Vol 110 (3) ◽  
pp. 807-818 ◽  
Author(s):  
Yaru Lin ◽  
Dexter B. Watts ◽  
Edzard van Santen ◽  
Guanqun Cao
Keyword(s):  
Meta Analysis ◽  
Poultry Litter ◽  
Crop Productivity ◽  
Field Conditions

scholarly journals Biochar—A Panacea for Agriculture or Just Carbon?

Horticulturae ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 37
Author(s):  
Elvir Tenic ◽  
Rishikesh Ghogare ◽  
Amit Dhingra
Keyword(s):  
Soil Properties ◽  
Positive Impact ◽  
Meta Analysis ◽  
Soil Health ◽  
Crop Productivity ◽  
Field Application ◽  
Arable Soils ◽  
Research Areas ◽  
Marginal Soils ◽  
Decomposition Of Organic Matter

The sustainable production of food faces formidable challenges. Foremost is the availability of arable soils, which have been ravaged by the overuse of fertilizers and detrimental soil management techniques. The maintenance of soil quality and reclamation of marginal soils are urgent priorities. The use of biochar, a carbon-rich, porous material thought to improve various soil properties, is gaining interest. Biochar (BC) is produced through the thermochemical decomposition of organic matter in a process known as pyrolysis. Importantly, the source of organic material, or ‘feedstock’, used in this process and different parameters of pyrolysis determine the chemical and physical properties of biochar. The incorporation of BC impacts soil–water relations and soil health, and it has been shown to have an overall positive impact on crop yield; however, pre-existing physical, chemical, and biological soil properties influence the outcome. The effects of long-term field application of BC and how it influences the soil microcosm also need to be understood. This literature review, including a focused meta-analysis, summarizes the key outcomes of BC studies and identifies critical research areas for future investigations. This knowledge will facilitate the predictable enhancement of crop productivity and meaningful carbon sequestration.

The impact of service innovation on firm performance: a meta-analysis

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Changli Feng ◽  
Ruize Ma ◽  
Lin Jiang
Keyword(s):  
Firm Performance ◽  
Positive Impact ◽  
Meta Analysis ◽  
Service Innovation ◽  
Future Research ◽  
Quantitative Review ◽  
Content Type ◽  
And Performance ◽  
The Impact ◽  
The Relationship

PurposeWith the rise of service economy, many companies are attempting to gain a competitive advantage through service innovation. However, the existing research has not drawn consistent conclusions about the relationship between service innovation and firm performance. Hence, the purpose of this paper is to provide a quantitative review on the service innovation-performance relationship based on research findings reported in the extant literature.Design/methodology/approachStudies from 46 peer-reviewed articles were sampled and analyzed. A meta-analytic approach was adopted to conduct a quantitative review on the relationship between service innovation and firm performance, and the effects of any potential moderators were further explored.FindingsThe results found that service innovation has a significant positive impact on firm performance. Additionally, the relationship between service innovation and firm performance is influenced by measurement moderators (economic region and performance measurement), and contextual moderators (firm type, innovation type, customer factors and attitudes toward risk).Originality/valueThe meta-analysis has been used to explore the relationship between service innovation and firm performance, and the findings have contributed to the literature on service innovation, as well as providing future research directions.

scholarly journals Predictors of Hand Function Following Digit Replantation: Quantitative Review and Meta-Analysis

Hand ◽  
2019 ◽  
pp. 155894471983465
Author(s):  
Ashkaun Shaterian ◽  
Lohrasb Ross Sayadi ◽  
Ekaterina Tiourin ◽  
Daniel J. Gardner ◽  
Gregory R. D. Evans ◽  
...  
Keyword(s):  
Meta Analysis ◽  
Hand Function ◽  
Quantitative Review

scholarly journals Prenatal risk factors for autism: comprehensive meta-analysis

2009 ◽  
Vol 195 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Hannah Gardener ◽  
Donna Spiegelman ◽  
Stephen L. Buka
Keyword(s):  
Pregnancy Complications ◽  
Meta Analysis ◽  
Fetal Loss ◽  
Epidemiological Studies ◽  
Related Factors ◽  
Quantitative Review ◽  
Prenatal Factors ◽  
Prenatal Risk Factors ◽  
Summary Effect ◽  
Maternal Hypertension

BackgroundThe aetiology of autism is unknown, although prenatal exposures have been the focus of epidemiological research for over 40 years.AimsTo provide the first quantitative review and meta-analysis of the association between maternal pregnancy complications and pregnancy-related factors and risk of autism.MethodPubMed, Embase and PsycINFO databases were searched for epidemiological studies that examined the association between pregnancy-related factors and autism. Forty studies were eligible for inclusion in the meta-analysis. Summary effect estimates were calculated for factors examined in multiple studies.ResultsOver 50 prenatal factors have been examined. The factors associated with autism risk in the meta-analysis were advanced parental age at birth, maternal prenatal medication use, bleeding, gestational diabetes, being first born v. third or later, and having a mother born abroad. The factors with the strongest evidence against a role in autism risk included previous fetal loss and maternal hypertension, proteinuria, pre-eclampsia and swelling.ConclusionsThere is insufficient evidence to implicate any one prenatal factor in autism aetiology, although there is some evidence to suggest that exposure to pregnancy complications may increase the risk.

Dynamic Speed Feedback Signs Are Effective in Reducing Driver Speeds: A Meta-Analysis

2020 ◽  
Vol 2674 (12) ◽  
pp. 481-492
Author(s):  
Dan F.B. Flynn ◽  
Andrew Breck ◽  
Olivia Gillham ◽  
Randolph G. Atkins ◽  
Donald L. Fisher
Keyword(s):  
United States ◽  
Meta Analysis ◽  
The United States ◽  
Economic Costs ◽  
Work Zones ◽  
Major Focus ◽  
Passenger Cars ◽  
Quantitative Review ◽  
Automobile Crashes ◽  
Light Duty

Excess speed contributes to over a quarter of all fatal automobile crashes in the United States, costing society billions of dollars each year. Lowering excess speeds to reduce these human, societal, and economic costs is therefore a major focus of safety officials and highway engineers. This study presents a quantitative review of the effectiveness of dynamic speed feedback signs (DSFS), which provide drivers with real-time feedback on their speed so that drivers traveling above the posted speed can slow appropriately. Using a meta-analysis of 43 publications, this study demonstrates that DSFS can effectively reduce speeds in different contexts (e.g., school and work zones) and for different vehicle types (e.g., heavy and light duty). Across all types of contexts and vehicle types that were analyzed, the meta-analysis identified statistically significant reductions in speeds when DSFS are installed. Overall, reductions of 4 mph were detected as a result of DSFS installation for passenger cars, and reductions between 2 and 4 mph were detected across vehicle types in the different contexts assessed. As reductions in speed of just 4 mph of vehicles traveling 30–35 mph can reduce fatal pedestrian-vehicle strikes by upwards of 40%, these findings demonstrate that the reductions in speed at DSFS were not only statistically significant, but also practically significant in areas such as school zones and work zones.

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