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Relationships between dynamics of nitrogen uptake and dry matter accumulation in maize crops. Determination of critical N concentration
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Relationships between dynamics of nitrogen uptake and dry matter accumulation in maize crops. Determination of critical N concentration
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Journal Article
Relationships between dynamics of nitrogen uptake and dry matter accumulation in maize crops. Determination of critical N concentration
1999
Overview
The concept of critical nitrogen concentration (% Nc) has been proposed as the minimum % N in shoots required to produce the maximum aerial biomass at a given time. Several authors have shown that % Nc declines as a function of aerial biomass accumulation (W) and the % Nc - W relationship has been proposed as a diagnostic tool of N status in different crops, excluding maize. From data obtained in five nitrogen fertilisation experiments in irrigated maize crops, 26 critical data-points were selected with a precise statistical procedure. An allometric relation was fitted and a critical % N - W relationship model is proposed in maize as: If W < 1 t ha⁻¹ % Nc = 3.40 If 1 t h a⁻¹ < W < 22 t ha⁻¹ % Nc = 3.40 (W)-0.37 The model is applicable to maize crop development between emergence and silking + 25 days. The model was tested and validated with data obtained in a network of 17 N fertilisation experiments conducted in France under contrasting pedoclimatic conditions. In only nine out of 280 data-points (3.2%), the plant N status was mispredicted when ± 5% error around % Nc was allowed. A critical N uptake model (Nuc, kg N ha⁻¹) is proposed as Nuc = 34 (W)0.63 A comparison between Nuc and N uptake observed in N treatments giving the maximal grain yields has shown that maize crops assimilate at least 30 kg N ha⁻¹ in a storage N pool at the silking stage. The significance of the critical % N — W and Nu—W relationships is discussed in relation to theoretical models proposed in whole plant ecophysiology. Different relationships calculated between leaf area index and aerial biomass accumulation, and between N uptake and leaf area were consistent with previous results for other crops. This strengthens the interest of the critical % N — W relationship for use as diagnostic tool of nitrogen status in maize crops.
Publisher
Springer Verlag,HAL CCSD,Kluwer Academic Publishers,Springer,Springer Nature B.V
Subject
/ ABSORCION DE SUSTANCIAS NUTRITIVAS
/ ABSORPTION DE SUBSTANCES NUTRITIVES
/ Agronomy. Soil science and plant productions
/ AZOTE
/ Biological and medical sciences
/ biomass
/ Corn
/ Crops
/ France
/ Fundamental and applied biological sciences. Psychology
/ GROWTH
/ Leaves
/ NITROGEN
/ Nutrition. Photosynthesis. Respiration. Metabolism
/ Plants
/ shoots
/ ZEA MAYS
