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

Table 4

Nitrogen rate × N application timing × variety interaction in 2009 for rotten tubers as a percentage of total yield for Russet potatoes grown on sandy loam soils in the Mid-Atlantic.

Nitrogen rate		Goldrush				Norkotah
	All at planting	2-splits	3-splits		All at planting	2-splits	3-splits
kg ha^−1	% of total yield
0^†	11.8				21.8
67	47.2 ab^‡	29.3 cdef	34.6 bcdef		24.5 ef	29.6 cdef	33.7 bcdef
134	31.2 cdef	31.9 bcdef	35.4 abcdef		35.3 abcdef	26.7 def	43.4 abc
201	23.2 f	50.8 a	33.0 bcdef		39.8 abcde	29.7 cdef	36.6 abcdef
268	36.4 abcdef	26.3 def	35.2 abcdef		31.6 bcdef	42.9 abc	41.9 abcd
LSD0.10	15.9
Pr > F	0.0399

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