Einfluß steigender Stickstoffgaben auf den Kupferernährungszustand von Getreide |
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| Authors: | Reiner Krhmer Burkhard Sattelmacher |
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| Institution: | Reiner Krähmer,Burkhard Sattelmacher |
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| Abstract: | Effect of increasing nitrogen fertilization on copper demand in cereals Pot experiments were conducted with wheat (2 experiments) and spring barley (1 experiment) in a peat soil. Four N and four Cu fertilizer levels were chosen in such a way that, based on grain yield, within each N level there was a Cu deficient and a Cu sufficient treatment. For sufficient Cu supply, Cu level in soil and plant increased with increasing N level. Critical Cu concentrations in aboveground biomass at shooting μg (g dw)?1] were 3.5 (lowest N level = N1) to 7.5 (highest N level = N4) for grain production of wheat and barley, but for aboveground biomass of wheat at shooting they were only 2.6 (N1) to 5.8 (N4). Based on critical Cu concentration at different N levels, critical Cu/N ratios were determined. These were independent from N level, indicating that Cu remobilization in the older leaves is unlikely even at N deficiency. The high critical Cu concentrations at high N levels may be explained by an increased immobilization of Cu. Under Cu deficient conditions, Cu concentration did not increase with increasing N level. However, under Cu sufficient conditions, N concentration and Cu concentration of the plant increased with increasing N level. The increasing Cu uptake with increasing N level may be explained by the release of amines into the root apoplast and the rhizosphere. Particularly under Cu sufficient conditions, these may mobilize Cu by formation of soluble Cu-amine complexes. |
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