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M A Y J U N E 2 0 1 618 POTATO GROWER Chip Cultivar Trial In Inkster North Dakota by Andy Robinson Eric Brandvik and Alan Bingham NDSUUMN Potato Extension Agronomy As part of a North Dakota Specialty Crop Block grant we tested ten dif- ferent cultivars for their agronomic performance. This trial was planted at the irrigated research site near Inkster ND on June 10 2015 with a 2-row research planter. The ten cul- tivars planted were Russet Burbank Pinnacle Manistee Umatilla Accumulator Nicolet Lamoka Snowden Atlantic and MegaChip. Each plot was 1 row wide 3 feet by 25 feet long. Prior to planting 67 lba of nitrogen 124 lba potassi- um 30 lba sulfur 1.5 lba zinc 2 lba boron and 1 lba copper were incorporated. At planting 29 lba of nitrogen and 100 lba of phospho- rous were applied as liquid starter. Nitrogen was side dressed at 70 lba on June 23 and plots received 30 lba of nitrogen by fertigation on August 3 and 12. Typical agronomic management practices were used to grow the crop. Stand and stem number were counted on July 10. Tubers were harvested on 15 October 2015 and graded thereafter for yield. There were differences in the grad- ed yield data. Atlantic was the best performing cultivar tested when compared across yield parameters Table 1. It had the greatest numer- ical amount of tubers from 6-10 oz 10-14 oz total yield marketable yield and percent tubers 6 oz. Pinnacle and Snowden tended to have a large number of undersized tubers 4 oz. Pinnacle and Snowden averaged 34-42 of tubers undersized. However this may have been because the stem number Table 2 was high on these cultivars. The lower yields may have been a result of late planting and too much nitrogen because an earlier cultivar like Atlantic per- formed well. Table 1. Graded yield of ten cultivars grown at Inkster ND in 2015. Within columns a significant difference is indicated by a different letter at p0.05. 14 oz -------------------------------------------- Cwta -------------------------------------------- Russet Burbank 4 c 81 145 a-d 51 ab 19 Pinnacle 1 a 106 88 d 18 b 2 Manistee MSL292-A 9 abc 103 102 bcd 21 b 3 Umatilla 9 abc 111 121 a-d 22 b 1 Accumulator 7 bc 94 174 ab 48 ab 12 Nicolet 8 abc 112 149 a-d 37 ab 23 Lamoka 8 abc 112 168 abc 30 ab 9 Snowden 1 ab 114 94 cd 17 b 9 Atlantic 5 bc 108 203 a 61 a 25 MegaChip 6 bc 82 147 a-d 44 ab 13