Abstract
Data from field experiments carried out in three consecutive years under contrasting N supply and radiation environment altered by artificial shading were used to identify (a) the relationship between N concentration and organ size under conditions of unrestricted N supply and (b) critical levels of soil nitrate (Nmincrit), where nitrogen concentration of cauliflower organs begin to decline because of N limitations. The decline of N concentrations in cauliflower was analysed at different levels of morphological aggregation, i.e., the whole shoot level, the organ level (leaves, stem, and curd), and within different leaf groups within the canopy. Nmincrit values (0–60 cm soil depth) for total nitrogen concentration of cauliflower organs leaves, stem and curd were estimated at 85, 93 and 28 kg N ha−1, respectively. Within the canopy, Nmincrit values for total N of leaves increased from the top to the bottom from 44 to 188 kg N ha−1. Nmincrit values for protein N in leaves from different layers of the canopy were much lower at around 30 kg N ha−1, without a gradient within the canopy. It is discussed that these differences in Nmincrit values are most likely a consequence of N redistribution associated with nitrogen deficiency. The decline of average shoot nitrogen concentrations, [Nm] (%N DM), with shoot dry matter, W sh, (t ha−1) under conditions of optimal N supply was [Nm]= 4.84 (±0.071) W sh −0.089(± 0.011), r 2=0.67 (±S.E.). The reduction of radiation intensity by artificial shading (60% of control) had no significant influence on total nitrogen concentrations of leaves and only a small influence on protein nitrogen concentrations in lower layers of the canopy. The leaf nitrate nitrogen fraction of nitrogen, f nitr (–), within the canopy decreased linearly with increased average incident irradiance in different canopy layers (I av, W PAR m−2) (f Nitr. = 0.2456(±0.0188) – 0.0023(±0.0004)I av, r 2 = 0.67.
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Kage, H., Alt, C. & Stützel, H. Nitrogen concentration of cauliflower organs as determined by organ size, N supply, and radiation environment. Plant and Soil 246, 201–209 (2002). https://doi.org/10.1023/A:1020627723616
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DOI: https://doi.org/10.1023/A:1020627723616