We investigated the effect of defoliation on the occurrence of internal browning in Momotaro York tomatoes planted hydroponically in a glass greenhouse and in a controlled environment chamber. Internal browning may be caused by Ca deficiency and may be suppressed by performing defoliation. Internal browning is characterized by the discoloration (browning) of the inside of fruits while the external surface appears normal consequently, affected fruits reach consumers without detection. Internal browning is a physiological disorder affecting tomatoes ( Solanum lycopersicum L.), and presents a major problem to Japanese producers.
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