A New Method for Winter Wheat Critical Nitrogen Curve Determination

As a plant-based N diagnostic tool, critical N curves can be used to adjust the N input in a field according to the crop demand. Because the existing critical N curve determination methods may overestimate the critical N point, making the designed N curve above the actual one, this study presents an improved method to overcome this drawback. An N experiment was conducted during 2 yr (2010-2012) using different winter wheat (Triticum aestivum L.) cultivars in the northwestern plain of Shandong Province, China. Shoot biomass and N concentration were sampled weekly during the growing season. A new method for designing critical N curves was developed based on the existing N curve determination method and the t-test inversion. Using the above data set, the new and existing methods for designing a critical N curve were compared, and the effects of the different cultivars on the proposed N curve were evaluated. The results showed that the critical N curves generated using existing methods can successfully classify N-limited plants but fail to classify non-N-limited plants, however, the critical N curve determined using the new method was able to classify both N-limited and non-N-limited plants satisfactorily. Cross-validation showed that the new method exhibited a highest total correct classification rate of 76%, while the existing methods displayed total correct classification rates below 64%. Additionally, the proposed critical N curve is robust within species within the same region. Thus, the new method may be useful for N management in the field.

[1]  G. Lemaire,et al.  Relation entre dynamique de croissance et dynamique de prélèvement d'azote pour un peuplement de graminées fourragères. II. Etude de la variabilité entre génotypes , 1984 .

[2]  Gilles Lemaire,et al.  Relation entre dynamique de croissance et dynamique de prélèvement d'azote pour un peuplement de graminées fourragères. I. — Etude de l'effet du milieu , 1984 .

[3]  Gilles Lemaire,et al.  Decline in Percentage N of C3 and C4 Crops with Increasing Plant Mass , 1990 .

[4]  William L. Pan,et al.  Optimizing Yield and Grain Protein in Soft White Winter Wheat with Split Nitrogen Applications , 1994 .

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

[6]  J. S. Schepers,et al.  Use of a Chlorophyll Meter to Monitor Nitrogen Status and Schedule Fertigation for Corn , 1995 .

[7]  P. L. Mitchell,et al.  Critical nitrogen concentrations: implications for high-yielding rice (Oryza sativa L.) cultivars in the tropics , 1998 .

[8]  O. Oenema,et al.  Does the crop or the soil indicate how to save nitrogen in maize production? Reviewing the state of the art , 2000 .

[9]  G. Bélanger,et al.  Nitrogen utilization by forage grasses. , 2000 .

[10]  Friedhelm Taube,et al.  The range of the critical nitrogen dilution curve for maize (Zea mays L.) can be extended until silage maturity , 2004 .

[11]  François Gastal,et al.  Nitrogen Dilution Curves and Nitrogen Use Efficiency During Winter–Spring Growth of Annual Ryegrass , 2004 .

[12]  S. G. Pandalai,et al.  Determining nitrogen requirements from crops characteristics. Benefits and challenges. , 2004 .

[13]  G. Lemaire,et al.  Relationships between dynamics of nitrogen uptake and dry matter accumulation in maize crops. Determination of critical N concentration , 1999, Plant and Soil.

[14]  David Scholefield,et al.  Assessment of the nitrogen status of grassland , 2004 .

[15]  G. Lemaire,et al.  Developmental changes in shoot N dynamics of lucerne (Medicago sativa L.) in relation to leaf growth dynamics as a function of plant density and hierarchical position within the canopy. , 2005, Journal of experimental botany.

[16]  L. López-Bellido,et al.  Nitrogen efficiency in wheat under rainfed Mediterranean conditions as affected by split nitrogen application , 2005 .

[17]  Bingzi Zhao,et al.  Groundwater Contamination with NO3-N in a Wheat-Corn Cropping System in the North China Plain , 2007 .

[18]  M. Jeuffroy,et al.  Is crop N demand more closely related to dry matter accumulation or leaf area expansion during vegetative growth , 2007 .

[19]  C. Dambreville,et al.  N2O emission in maize-crops fertilized with pig slurry, matured pig manure or ammonium nitrate in Brittany , 2008 .

[20]  M. Jeuffroy,et al.  Diagnosis tool for plant and crop N status in vegetative stage Theory and practices for crop N management , 2008 .

[21]  N. Tremblay,et al.  Critical Nitrogen Curve and Nitrogen Nutrition Index for Corn in Eastern Canada , 2008 .

[22]  Wenjiang Huang,et al.  Effects of two kinds of variable‐rate nitrogen application strategies on the production of winter wheat (Triticum aestivum) , 2009 .

[23]  Gilles Lemaire,et al.  Chapter 8 – Quantifying Crop Responses to Nitrogen Deficiency and Avenues to Improve Nitrogen Use Efficiency , 2009 .

[24]  N. Tremblay,et al.  Determination of a Critical Nitrogen Dilution Curve for Spring Wheat , 2010 .

[25]  Nicolas Tremblay,et al.  Plant-Based Diagnostic Tools for Evaluating Wheat Nitrogen Status , 2010 .

[26]  Nicolas Tremblay,et al.  Sensing of Crop Nitrogen Status: Opportunities, Tools, Limitations, and Supporting Information Requirements , 2011 .

[27]  Fusuo Zhang,et al.  Critical Nitrogen Dilution Curve for Optimizing Nitrogen Management of Winter Wheat Production in the North China Plain , 2012 .