Ammoniakemissionen aus alternden Pflanzen und bei der Zersetzung von Ernterückständen |
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| Authors: | Thomas Mannheim Jrg Braschkat Horst Marschner |
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| Institution: | Thomas Mannheim,Jörg Braschkat,Horst Marschner |
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| Abstract: | Ammonia emissions from senescing plants and during decomposition of crop residues NH3 emissions from plant stands, measured under simulated environmental conditions with the wind tunnel method, ranged between 0.8 and 1.4% of the N content of the shoot, equivalent to 1.1 to 2.9 kg NH3-N ha?1. The highest emissions were observed in faba beans whereas the emissions in winter wheat, spring rape and white mustard were lower. The total NH3 emissions were not affected by removing a part of the ears (sink reduction), but emissions occurred earlier, as did the plant senescence. This suggests that the NH3 emissions are closely related to senescence. NH3 emissions from decomposing crop residues ranged from 0.9 to 3.7% of the N content. The emissions from sugar beet leaves and potato shoots with high water content reached from 8.6 up to 12.6 kg N ha?1, whereas the emissions from field bean straw with high dry matter and N content were relatively low. (3.1 kg N ha?1, or 0.9% of the N content). The NH3 emissions from sugar beet leaves were reduced by 81% by ploughing and 63% by mulching. |
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