Abstract
Field trials were carried out during 1995–1998 in commercial crops of five potato cultivars grown at several locations in Argentina to test maleic hydrazide (MH potassium salt, 36% ) effects on tuber yield, sprouting characteristics, and processing quality. MH was applied at growth stage IV, when developing tubers were 40–70 mm, at 9, 10,12 and 14 1 ha-1 in single or split treatments. MH treatments did not produce phytotoxicity symptoms in the foliage and did not decrease tuber yield. MH increased tuber yield in Kennebec, Russet Burbank and Shepody in several experiments, while not in Atlantic and Ranger Russet. MH treatments delayed initial sprouting date and inhibited sprout growth during storage periods up to 8 months, which resulted in lower weight losses due to sprouting. Tuber dry matter content and fry color were similar or in some cases improved due to MH treatments, while no consistent results were found regarding reducing sugar content.
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