Nitrogen Fertilizer and Growth Regulator Impacts on Tuber Deformity, Rot, and Yield for Russet Potatoes

Table 7

Nitrogen rate × variety interaction in 2010 for 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 N application timing.

Nitrogen rate	Rotten tubers			Marketable yield			Total yield
	Goldrush	Norkotah		Goldrush	Norkotah		Goldrush	Norkotah
kg ha^−1	Percentage of total yield			kg ha^−1			kg ha^−1
0^†	18.8	14.0		8507	7735		9839	8792
67	43.0 a^‡	12.2 bc		9239 c	21266 b		13593 d	23777 bc
134	48.2 a	8.6 c		8396 c	27409 a		14009 d	29957 a
201	21.7 b	11.6 bc		21100 b	26972 a		26121 abc	30360 a
268	20.4 b	13.2 bc		19000 b	2444 c		23309 c	28195 ab
LSD0.10	10.6			4744			4812
Pr > F	0.0009			0.0033			0.0184

^†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).