Table 2: Nitrogen rate main effect in 2009 for deformed tubers, rotten tubers as a percentage of total yield, marketable tuber yield, and total tuber yield for Russet potatoes grown on sandy loam soils in the Mid-Atlantic, averaged across Russet cultivars and N application timing.

Nitrogen rateDeformed tubersRotten tubersMarketable yieldTotal yield
kg ha−1Percentage of tubersPercentage of total yieldkg ha−1

6745.8 b33.2 a12248 a 17360 b
13454.2 ab34.0 a14884 a21515 a
20158.3 a35.5 a12862 a 19267 ab
26861.5 a35.7 a12248 a21507 a

Pr > F0.04450.89670.42000.0995

No-fertilizer control plots were not included in Analysis of Variance and are included for informational purposes only.
Means within each dependent variable with the same letter are not significantly different (P ≥ 0.10, Fisher’s Protected LSD) and can be compared within column.