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Ermittlung von Toxizitäts‐Grenzwerten für Zink, Kupfer und Blei in Hafer und Rotklee
Author(s) -
Hodenberg Adelheid V.,
Finck A.
Publication year - 1975
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19751380412
Subject(s) - limiting , toxicity , chemistry , zoology , toxicology , nuclear chemistry , horticulture , biology , mechanical engineering , organic chemistry , engineering
Determination of toxicity limiting values of Zn, Cu and Pb for oat and red clover . Toxicity limiting values of Zn, Cu and Pb are determined in order to investigate the causes of growth damages in certain fields. Since the ‘true’ toxicity limit is difficult to estimate, a (somewhat higher) content is called toxicity limiting value resulting after substraction of a significant yield difference. The pot experiments with increasing fertilization of Zn, Cu and Pb in soil culture gave the following results (summarized in tables in the discussion):. For Zn the toxicity limit is 410 ppm in oats at the beginning of tillering. In red clover of six weeks age it is only 290 ppm Zn and therefore much lower. For Cu the toxicity limit is 20 ppm in oats at the beginning of tillering and 18 ppm in six weeks old red clover. For Pb a toxic effect could be observed above 50 ppm, but this does not seem to be the true limit because of disturbing salt effects.