Predicting yield losses caused by lodging in wheat

Abstract Lodging is a major limiting factor for wheat ( Triticum aestivum L.) production, yet few studies have investigated the mechanism by which it reduces yield. This paper tests the hypothesis that lodging-induced yield losses in wheat can be predicted by calculating the reduction in canopy photosynthesis that results from lodging-induced changes to the architecture of the canopy. An existing model of canopy photosynthesis has been further developed to account for the effect of lodging-induced changes to the canopy architecture on photosynthesis and grain yield. The model predicted that lodging at 90° from the vertical will reduce yield by approximately 61%. The ability of the model to predict lodging-induced yield losses was tested against observations made in three separate field experiments. The model predicted 71% of the variation in the proportion of yield lost due to lodging ( Y LOSS ) and the best-fit line was not significantly different from the 1:1 relationship. Sensitivity analysis showed that the proportion of yield lost was relatively insensitive to the model parameters. As a result it was shown that a simplified model could be employed without losing predictive accuracy. Y LOSS = ∑ i f ( L 90 × 0.7 + L 65 × 0.3 + L 25 × 0.1 ) / n In this equation i and f are the 1st and last days of grain filling, L 90 is the proportion of crop area lodged at 85–90° from the vertical, L 65 is the proportion of crop area lodged between 46° and 84°, L 25 is the proportion of crop area lodged between 5° and 45° and n is the number of days of grain filling.

[1]  Gustavo A. Slafer,et al.  Lodging yield penalties as affected by breeding in Mediterranean wheats , 2011 .

[2]  K. G. Briggs.  STUDIES OF RECOVERY FROM ARTIFICIALLY INDUCED LODGING IN SEVERAL SIX-ROW BARLEY CULTIVARS , 1990 .

[3]  A. Todd,et al.  Estimation of radiation interception by winter wheat from measurements of leaf area , 1988, The Journal of Agricultural Science.

[4]  R. Fischer,et al.  Contribution of stored pre-anthesis assimilate to grain yield in wheat and barley , 1977, Nature.

[5]  A. R. Ennos,et al.  The Mechanics of Root Lodging in Winter Wheat, Triticum aestivum L. , 1993 .

[6]  Mark Sterling,et al.  A calibrated model of wheat lodging compared with field measurements , 2003 .

[7]  A. J. Walker,et al.  Introduction to the Physiology of Crop Yield , 1989 .

[8]  A. R. Ennos,et al.  Understanding and Reducing Lodging in Cereals , 2004 .

[9]  Roger Sylvester-Bradley,et al.  Controlling plant form through husbandry to minimise lodging in wheat , 2000 .

[10]  P. Berry,et al.  Predicting lodging in winter wheat , 1998 .

[11]  R. B. Austin,et al.  Flag Leaf Photosynthesis of Triticum aestivum and Related Diploid and Tetraploid Species , 1982 .

[12]  D. R. Tottman.  The decimal code for the growth stages of cereals, with illustrations , 1987 .

[13]  Bhaskar J. Choudhury,et al.  A sensitivity analysis of the radiation use efficiency for gross photosynthesis and net carbon accumulation by wheat , 2000 .

[14]  J. Spencer-Smith,et al.  An analysis of the problem of lodging with particular reference to wheat and barley , 1975, The Journal of Agricultural Science.

[15]  M. Stapper,et al.  Genotype, sowing date and plant spacing influence on high-yielding irrigated wheat in southern New South Wales. III. Potential yields and optimum flowering dates , 1990 .

[16]  R. B. Austin,et al.  The Fate of the Dry Matter, Carbohydrates and 14C Lost from the Leaves and Stems of Wheat during Grain Filling , 1977 .

[17]  H. H. Laude,et al.  Influence of Lodging on Yield and Other Characters in Winter Wheat1 , 1956 .

[18]  J. Zadoks.  A decimal code for the growth stages of cereals , 1974 .

[19]  Lijun Liu,et al.  Water Deficit–Induced Senescence and Its Relationship to the Remobilization of Pre-Stored Carbon in Wheat during Grain Filling , 2001 .

[20]  J. Monteith.  Light Distribution and Photosynthesis in Field Crops , 1965 .

[21]  Peter J. Gregory,et al.  Nutrient relations of winter wheat:3. Nitrogen uptake, photosynthesis of flag leaves and translocation of nitrogen to grain , 1981, The Journal of Agricultural Science.

[22]  G. Campbell,et al.  An Introduction to Environmental Biophysics , 1977 .

[23]  Peter J. Gregory,et al.  Nutrient relations of winter wheat: 1. Accumulation and distribution of Na, K, Ca, Mg, P, S and N , 1979, The Journal of Agricultural Science.

[24]  R. Sylvester-Bradley,et al.  Ideotype design for lodging-resistant wheat , 2007, Euphytica.

[25]  S. Asseng,et al.  Analysis of the benefits to wheat yield from assimilates stored prior to grain filling in a range of environments* , 2003, Plant and Soil.

[26]  W. Kühbauch,et al.  The utilization of pre‐anthesis reserves in grain filling of wheat. Assessment by steady‐state 13CO2/12CO2 labelling , 1999 .

[27]  D. Easson,et al.  The effects of weather, seed rate and cultivar on lodging and yield in winter wheat , 1993, The Journal of Agricultural Science.

[28]  R. A. Fischer,et al.  Lodging effects on high-yielding crops of irrigated semidwarf wheat , 1987 .

[29]  R. K. Scott,et al.  The physiological response of winter wheat to reductions in plant density , 2000 .

[30]  Moshe J. Pinthus,et al.  Lodging in Wheat, Barley, and Oats: The Phenomenon, its Causes, and Preventive Measures , 1974 .

[31]  J. Amthor.  Respiration and crop productivity , 2004, Plant Growth Regulation.

[32]  E. V. Laureles,et al.  Lodging reduces yield of rice by self-shading and reductions in canopy photosynthesis , 1997 .

[33]  Michael L. Poole,et al.  Source–sink balance and manipulating sink–source relations of wheat indicate that the yield potential of wheat is sink-limited in high-rainfall zones , 2010 .

[34]  J. W. Pendleton,et al.  Effect of Artificial Lodging on Winter Wheat Grain Yield and Quality1 , 1964 .

[35]  E. G. Mulder.  Effect of mineral nutrition on lodging of cereals , 1954, Plant and Soil.

[36]  Roger Sylvester-Bradley,et al.  Physiological Processes Associated with Wheat Yield Progress in the UK , 2005, Crop Science.