Nitrogen and Spacing Requirements for Advanced Chipping Selections ND7799c-1 and ND7519-1

Monday, July 26, 2021
4:30 PM - 4:45 PM

Jed Grow

When new potato cultivars are released, growers sometimes manage them as they would traditional cultivars which can lead to poor yield performance, problematic tuber size profiles and even undesirable chip quality. The poorly managed varieties are often not adopted and grown in large numbers in terms of acreage. In order to better understand the best agronomic practices for two new varieties to ensure a high adoption rate by growers, a study was carried out in 2018 and 2019 for the advanced chipping selections ND7799c-1 and ND7519-1. During the growing season nitrogen fertilization amounts, nitrogen use efficiency, and seedpiece spacing were analyzed. After harvest Hunter score, glucose, sucrose, and specific gravity of the tubers were analyzed to assess chip quality. Results indicated that ND7799c-1 grown at 23cm seed piece spacing had a similar marketable yield to the current industry standard, Dakota Pearl. ND7519 yielded lower than Dakota Pearl, but showed a higher percentage of marketable yield compared to total yield. Nitrogen was found not to be a significant variable across all rates resulting in growers being able to cut back on their nitrogen fertilization without sacrificing yield. Seedpiece spacing and cultivars used were also significant for yield, and stems per plant. ND7799c-1 had a higher nitrogen use efficiency than ND7519. Both varieties had lower sucrose and glucose levels at the time of harvest compared to Dakota Pearl across all nitrogen levels. ND7799c-1 could be stored for 8 months and ND7519 could be stored 6-8 months before a decrease in chip quality. Implications from the research show that ND7799c-1 and ND7519 would be successful in the Red River Valley area. These varieties can benefit growers because of the allowance for immediate chipping after harvest and lower nitrogen fertilization requirements.

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