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

^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

View larger version (23K): [in a new window]   Fig. 1. Nitrogen nutrition index (NNI) over time for wheat grown under N and radiation treatments in the three experiments

View larger version (23K): [in a new window]   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

View larger version (17K): [in a new window]   Fig. 3. Relationship between nitrogen nutrition index (NNI) at anthesis and kernel number per square meter (KN) for all treatments classified according to shading

View larger version (18K): [in a new window]   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

View larger version (23K): [in a new window]   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)