Meta-analysis of grass ley response to phosphorus fertilization in Finland

2015 ◽  
Vol 71 (1) ◽  
pp. 36-53 ◽  
Author(s):  
E. Valkama ◽  
P. Virkajärvi ◽  
R. Uusitalo ◽  
K. Ylivainio ◽  
E. Turtola
Keyword(s):  
Meta Analysis ◽  
Phosphorus Fertilization ◽  
Grass Ley

Phosphorus fertilization: A meta-analysis of 80 years of research in Finland

2009 ◽  
Vol 130 (3-4) ◽  
pp. 75-85 ◽  
Author(s):  
Elena Valkama ◽  
Risto Uusitalo ◽  
Kari Ylivainio ◽  
Perttu Virkajärvi ◽  
Eila Turtola
Keyword(s):  
Meta Analysis ◽  
Phosphorus Fertilization

scholarly journals Phosphorus fertilization and herbage production in Finland

2014 ◽  
pp. 1-4
Author(s):  
Elena Valkama ◽  
Perttu Virkajärvi ◽  
Risto Uusitalo ◽  
Kari Ylivainio ◽  
Eila Turtola
Keyword(s):  
Field Experiments ◽  
Meta Analysis ◽  
Yield Response ◽  
Phosphorus Fertilization ◽  
Organic Soils ◽  
P Fertilization ◽  
Explanatory Variables ◽  
Yield Level ◽  
Sources Of Variation ◽  
Mineral Soils

The herbage yield responses to phosphorus (P) fertilization show large variation and, unlike to cereals, initial soil test P (STP) does not always predict such variation. By using meta-analysis, we reviewed quantitatively 38 Finnish field experiments related to the effects of P fertilization on herbage dry matter (DM) yields in the 1960s – 2000s. The current meta-analysis has several advantages over other type of research aiming to summarize the effect of P fertilization on herbage production. It involves large number of studies, diversity of soils and cultivation zones, and it enables to highlight the sources of variation in responses across the studies. Along with clay and coarse-textured mineral soils, we observed 20 studies on organic soils, whereas previous European and Canadian studies on the same topic involved mostly mineral soils. Moreover, we developed yield response models for different soil textures and initial STP levels. The summarized effect of P fertilization (mean 50 kg P ha-1) on DM yields was 13% over the control (N and K fertilization) with large variation across the studies from –10% to 70%. The major sources of variation were soil texture, soil acidity (for organic soils), initial STP and the yield level in control. For example, the yield response was three times larger on organic soils than on clay or coarse-textured mineral soils. Moreover, the yield response was double on slightly acidic organic soils (29%, n = 8) compared to that on moderately acidic ones (15%, n = 11). Thus, for acidic organic soils, even with low STP, P fertilization may be practically useless until the soils are first limed. Meta-regression proved that generally the responses reduced with increasing initial STP across the studies and reached zero at high STP (PAc, 21 mg l-1). However, in some studies with high control yields, no responses were observed even at low STP, since the responses decreased linearly with increasing control yields. Finally, the responses did not statistically differ between the cultivation zones, cut frequency, decades, or between the studies having different duration of experiments. Variation in herbage yields that is often observed in P fertilizer experiments is only partly related to increasing P rates, but also other factors should be taken into account. Further studies should address to the role of, e.g., soil structure in yield development, as it is evident that additional relevant explanatory variables would be needed to adequately explain the variation in herbage yields.

scholarly journals Quantitative evaluation of the grain zinc in cereal crops caused by phosphorus fertilization. A meta-analysis

2021 ◽  
Vol 41 (1) ◽  
Author(s):  
Wei Zhang ◽  
Wushuai Zhang ◽  
Xiaozhong Wang ◽  
Dunyi Liu ◽  
Chunqin Zou ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Meta Analysis ◽  
Cereal Crops ◽  
Phosphorus Fertilization ◽  
Grain Zinc

The effects of low-ratio n-6/n-3 PUFA on biomarkers of inflammation: a systematic review and meta-analysis

2021 ◽  
Author(s):  
Yali Wei ◽  
Yan Meng ◽  
Na Li ◽  
Qian Wang ◽  
Liyong Chen
Keyword(s):  
Systematic Review ◽  
Fatty Acid ◽  
Polyunsaturated Fatty Acid ◽  
Meta Analysis ◽  
Chain Polyunsaturated Fatty Acid ◽  
Inflammation Markers ◽  
Pufa Supplementation ◽  
Long Chain

The purpose of the systematic review and meta-analysis was to determine if low-ratio n-6/n-3 long-chain polyunsaturated fatty acid (PUFA) supplementation affects serum inflammation markers based on current studies.

Chronic Pain: Fundamental Scientific Considerations, Specifically for Legal Claims

2013 ◽  
Vol 18 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Robert J. Barth
Keyword(s):  
Health Outcomes ◽  
Pain Perception ◽  
Driving Forces ◽  
Psychological Treatment ◽  
Dominant Role ◽  
Meta Analysis ◽  
General Medicine ◽  
Pain Syndrome ◽  
Problematic Relationship

Abstract Scientific findings have indicated that psychological and social factors are the driving forces behind most chronic benign pain presentations, especially in a claim context, and are relevant to at least three of the AMA Guides publications: AMA Guides to Evaluation of Disease and Injury Causation, AMA Guides to Work Ability and Return to Work, and AMA Guides to the Evaluation of Permanent Impairment. The author reviews and summarizes studies that have identified the dominant role of financial, psychological, and other non–general medicine factors in patients who report low back pain. For example, one meta-analysis found that compensation results in an increase in pain perception and a reduction in the ability to benefit from medical and psychological treatment. Other studies have found a correlation between the level of compensation and health outcomes (greater compensation is associated with worse outcomes), and legal systems that discourage compensation for pain produce better health outcomes. One study found that, among persons with carpal tunnel syndrome, claimants had worse outcomes than nonclaimants despite receiving more treatment; another examined the problematic relationship between complex regional pain syndrome (CRPS) and compensation and found that cases of CRPS are dominated by legal claims, a disparity that highlights the dominant role of compensation. Workers’ compensation claimants are almost never evaluated for personality disorders or mental illness. The article concludes with recommendations that evaluators can consider in individual cases.

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