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Intensity and Duration of Nitrogen Deficiency on Wheat Grain Number

^a Unité d'Agronomie INRA - INAPG, BP01, 78 850 Thiverval-Grignon, France. Sté Chimique La Grande Paroisse S.A. and I.N.R.A

View larger version (19K): [in a new window]   Fig. 1 Scheme of the various characteristics of N deficiency. BD = beginning of deficiency (when NNI falls under 0.90), ED = end of deficiency (when NNI increases above 0.90), DD = duration of deficiency (=BD-ED), ID = intensity of deficiency (= 1 - NNIminimum observed)

View larger version (33K): [in a new window]   Fig. 2 Changes in N nutrition index (NNI) over time, for the various treatments in the four experiments

View larger version (18K): [in a new window]   Fig. 3 Relationship between observed and predicted values of relative grain number (RGN), for all the crops described in Table 2, classified according to N deficiency (pd = permanent deficiency, td = temporary deficiency, and no d = no deficiency)

View larger version (18K): [in a new window]   Fig. 4 Relationship between IDD, the product of the intensity with the duration of the intensity, and the reduction in amount of N applied from that applied to control