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A visual symptom of ammonium toxicity on tomato (Lycopersicon esculentum, Mill.) is the development of shallow, brown, stem lesions. Lesion formation is alleviated by K fertilization. In this study, tomato cultivars and mutants differed in sensitivity to ammonium injury. Mutants, yellow‐green‐5 and neglecta‐1, accumulated high concentrations of K in their stems and were strongly resistant to ammonium toxicity from soil‐applied ammonium salts. Cultivars which were sensitive to ammonium injury accumulated much less K in their stems than did these mutant strains. Efficiency in K accumulation and the accompanying resistance to ammonium toxicity appeared to be heritable traits.
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Barker et al. (1986) studied this question.
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