Why are wheat yields stagnating in Europe? A comprehensive data analysis for France

The last two decades are witnessing a decline in the growth trend of cereal yields in many European countries. The present study analyses yield trends in France using various sources of data: national and regional statistics, scattered trials, results of agroclimatic models using climatic data. Effects in genetic changes through breeding, agronomy and climate are investigated as possible causes. Our results show that genetic progress has not declined but it was partly counteracted, from 1990 on, by climate change which in general is unfavorable to cereal yields in temperate climates because of heat stress during grain filling and drought during stem elongation. We cannot however, from the decade beginning in 2000, rule out agronomic causes, related to policy and economy, in particular the decline of legumes in the cereal rotations, replaced by oilseed rape and to a lesser extent the decrease in nitrogen fertilization.

[1]  M. Brancourt-Hulmel,et al.  Genetic Improvement of Agronomic Traits of Winter Wheat Cultivars Released in France from 1946 to 1992 , 2003 .

[2]  K. Hakala,et al.  Are there indications of climate change induced increases in variability of major field crops in the northernmost European conditions , 2008 .

[3]  P. Ciais,et al.  Carbon and water balance of European croplands throughout the 20th century , 2008 .

[4]  J. Palutikof,et al.  Climate change 2007: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Summary for Policymakers. , 2007 .

[5]  M. Fok Cotton yield stagnation addressing a common effect of various causes , 1998 .

[6]  J. Fuhrer,et al.  Climate change affects farm nitrogen loss - A Swiss case study with a dynamic farm model , 2007 .

[7]  R. Finger Impacts of Agricultural Policy Reforms on Crop Yields Incidences des réformes de la politique agricole sur les rendements des cultures Auswirkungen von Agrarpolitikreformen auf die Ernteerträge , 2008 .

[8]  P. Bottner,et al.  Long-term effects of temperature on carbon mineralisation processes , 2001 .

[9]  Christine Aubry,et al.  DéciBlé, a software package for wheat crop management simulation , 2005 .

[10]  E. Justes,et al.  Determination of a Critical Nitrogen Dilution Curve for Winter Wheat Crops , 1994 .

[11]  D. Lobell,et al.  Climate and Management Contributions to Recent Trends in U.S. Agricultural Yields , 2003, Science.

[12]  R. Finger Evidence of slowing yield growth – the example of Swiss cereal yields , 2010 .

[13]  E. S. Jensen,et al.  Grain legume functions in crop rotations , 2005 .

[14]  S. Chander,et al.  Effect of increasing temperature on yield of some winter crops in northwest India , 2008 .

[15]  S. Hafner Trends in maize, rice, and wheat yields for 188 nations over the past 40 years: a prevalence of linear growth , 2003 .

[16]  M. Rounsevell,et al.  Future scenarios of European agricultural land use: I. Estimating changes in crop productivity , 2005 .

[17]  F. Oury,et al.  Yield and grain protein concentration in bread wheat: how to use the negative relationship between the two characters to identify favourable genotypes? , 2007, Euphytica.

[18]  K. Cassman Ecological intensification of cereal production systems: yield potential, soil quality, and precision agriculture. , 1999, Proceedings of the National Academy of Sciences of the United States of America.

[19]  David B. Lobell,et al.  Analysis of wheat yield and climatic trends in Mexico , 2005 .

[20]  Kurt Hornik,et al.  Implementing a Class of Permutation Tests: The coin Package , 2008 .

[21]  Frank Ewert,et al.  Vulnerability and adaptation of European farmers: a multi-level analysis of yield and income responses to climate variability , 2009 .

[22]  Raj Kumar Gupta,et al.  How extensive are yield declines in long-term rice-wheat experiments in Asia? , 2003 .

[23]  Bruno Mary,et al.  Conceptual basis, formalisations and parameterization of the STICS crop model , 2009 .

[24]  Peter R. Shewry,et al.  Effects of Restricted Water Availability and Increased Temperature on the Grain Filling, Drying and Quality of Winter Wheat , 2003 .

[25]  S. Recous,et al.  STICS : a generic model for the simulation of crops and their water and nitrogen balances. I. Theory, and parameterization applied to wheat and corn , 1998 .

[26]  U. Koester Agriculture and German reunification , 1997 .

[27]  P. Peltonen-Sainio,et al.  Cereal yield trends in northern European conditions: changes in yield potential and its realisation. , 2009 .

[28]  Climate and Management Contributions to Recent Trends in U.S. Agricultural Yields , 2003 .

[29]  J. Peltonen,et al.  Progress since the 1930s in Breeding for Yield, its Components, and Quality Traits of Spring Wheat in Finland , 1994 .

[30]  Larry F. Lacey,et al.  Long-term effects of on , 1987 .

[31]  H. Sinoquet,et al.  An overview of the crop model STICS , 2003 .

[32]  B. Holmer Fluctuations of winter wheat yields in relation to length of winter in Sweden 1866 to 2006 , 2008 .

[33]  Cynthia Rosenzweig,et al.  Assessment of observed changes and responses in natural and managed systems , 2007 .

[34]  R. A. Fischer,et al.  Genetic and agronomic contributions to yield gains: A case study for wheat , 1995 .

[35]  G. Lemaire,et al.  N Uptake and Distribution in Plant Canopies , 1997 .

[36]  J.H.J. Spiertz,et al.  Crop production and resource use to meet the growing demand for food, feed and fuel: opportunities and constraints , 2009 .

[37]  E. Justes,et al.  Comparing the effectiveness of radish cover crop, oilseed rape volunteers and oilseed rape residues incorporation for reducing nitrate leaching , 1999, Nutrient Cycling in Agroecosystems.

[38]  G. Slafer,et al.  CHANGES IN YIELD AND YIELD STABILITY IN WHEAT DURING THE 20TH CENTURY , 1998 .

[39]  G. Fischer,et al.  Effects of climate change on global food production under SRES emissions and socio-economic scenarios , 2004 .

[40]  K. Cassman,et al.  Rice yields decline with higher night temperature from global warming. , 2004, Proceedings of the National Academy of Sciences of the United States of America.

[41]  V. Boken,et al.  Forecasting spring wheat yield using time series analysis: a case study for the Canadian prairies. , 2000 .

[42]  P. Jamieson,et al.  Grain number, wheat yield, and bottling beer : An analysis , 2006 .