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The multiplication technique by sprout cutting has been improved at St-Jean-sur-Richelieu in 1994. The tuber size has been increased to medium-large tubers and two different pre-sprouting periods has been extended to 190 days. In one trial, potatoes of 20 seedlings were warmed up after 4 to 8 weeks of storage at 3C and were placed under dry conditions under light or not, for more than 6 months. They were planted in flats (28 × 53 cm) filled with a soil mixture at 16 h of light 22–24C. When 50% of the sprouts had 3 to 4 cm, they were placed in the dark for 3 days or less. The sprout cutting was done the day after returning to the initial lighting condition. The tubers were sprout-cut after 6, 10, 16, 20, 24, and 32 days after planting. A yield of more than 90 sprout cuttings in 26 days was obtained with seven seedlings. LP86065 gave 140 cuttings in 16 days. In another trial, tubers with 7 months of cold storage were tested with the technique. In 23 days, `Superior' and LP85619 gave an average of 68.4 sprout cuttings in 23 days with only three steps of multiplication. A third trial with different periods of storage and pre-sprouting will be discussed. The multiplication rate depends on may factors, such as: firmness, number of sprouts by eye and eyes by tuber, sprouting conditions, and cultivar.

Multiplication of Bigger Potato Tubers by Sprout Cutting can Produce More Than 140 Cuttings in 16 Days