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Synopsis Nutritional factors affecting concealed‐damage in peanuts were studied in field experiments. Two forms of physiological damage were noted, one causing discoloration of the cotyledon and the other causing discoloration of the plumule. The amount of each form was decreased by applications of boron and/or calcium. The application of boron was more effective than calcium in reducing the percentage cotyledon damage whereas the application of calcium was more effective than boron in reducing the percentage plumule damage.
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Cox et al. (1964) studied this question.
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