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Incorporating Radiation and Nitrogen Nutrition into a Model of Kernel Number in Wheat

Sabine Demotes-Mainardb and Marie-Hélène Jeuffroya

a UMR d'Agronomie INRA-INA PG, BP 01, 78850 Thiverval-Grignon, France
b INRA, UMR SAGAH INRA/INH/Université d'Angers, 42 rue Georges Morel, BP 57, 49071 Beaucouzé cedex, France



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Fig. 1. Nitrogen nutrition index (NNI) over time for wheat grown under N and radiation treatments in the three experiments

 


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Fig. 2. Relationship between observed and simulated values of kernel number per square meter (KN) for all treatments classified according to nitrogen deficiency and shading. No D, No S = no deficiency, no shade; No D, S = no deficiency, shade; D, No S = deficiency, no shade; D, S = deficiency, shade

 


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Fig. 3. Relationship between nitrogen nutrition index (NNI) at anthesis and kernel number per square meter (KN) for all treatments classified according to shading

 


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Fig. 4. Relationship between photothermal quotient over the 45 d preceding anthesis (Q45) and kernel number per square meter (KN) for all treatments classified according to nitrogen deficiency between the end of winter and anthesis, and nitrogen nutrition index (NNI) at anthesis. No D = no deficiency. D, NNIa<1 = deficiency and NNI at anthesis <1. D, NNIa>1 = deficiency and NNI at anthesis >1

 


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Fig. 5. Relationship between observed and simulated values of kernel number per square meter (KN) obtained with Model 1 on the data of Jeuffroy and Bouchard (1999)

 





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