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Petiole sap nitrate concentration is a sensitive indicator of crop nitrogen status of various vegetable species. This makes it an interesting option for N management in vegetable production as it can enable rapid measurement and subsequent correction of deficient crop N status. The use of small rapid analysis systems enables on-farm measurement of sap [NO3−–N] to be made immediately after sampling (SOP 26).
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Gladys Sánchez (2026) studied this question.
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