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Chapter 8. Late Harvest Potato Variety Trial, 2006¹

C. M. Hutchinson and Doug Gergela²

General Comments: A goal of the Late Harvest potato variety trial is to identify varieties that yield well and have an acceptable appearance when harvested later in the season when growing conditions are usually more stressful.
Planting Information
Planting Site	PSREU - Hastings Farm, Hastings, FL
Planting Date	February 14, 2006
Vine Kill Date	May 25, 2006
Harvest Date	June 14, 2006
Season Length	100 days planting to vine kill; 120 days planting to harvest
Fertilizer Program	preplant, 100-43-86 lb/A; sidedress 50-0-43 (2 appl.)
Irrigation Program	seepage
Experimental Design
Number of Selections	15
Within Row Spacing	8 in (20.3 cm)
Between Row Spacing	40 in (101.6)
Replications	4
Plot Size	16 ft (4.9 m) single row
Production Statistics
Highest Total Yield	Fabula (468 cwt/acre or 52.4 MT/ha)
Highest Marketable Yield	Atlantic (393 cwt/acre or 44.0 MT/ha)
Best Appearance Rating	LaChipper and Belrus (7.0, good to excellent)
Highest Specific Gravity	Atlantic (1.086)

Tables

Table 2. Production statistics for "Late Harvested" White, Red, and Russet-Skinned potato selections.

	Total	Marketable Yield1		Size						Size Class
	Yield		% of	Distribution by Class (%)2						Range (%)		Specific
Clone	(cwt/A)	(cwt/A)	standard	C	B	A1	A2	A3	A4	A1 to A3	A2 to A3	Gravity
Atlantic	448	393	100	1	6	62	25	6	0	93	31	1.086
Adora	373	251	64	1	22	70	6	0	0	76	6	1.067
Andover	342	291	74	1	8	76	14	2	0	91	16	1.082
Belrus	306	255	65	2	14	81	3	1	0	84	3	1.085
Cherry Red	346	280	71	2	15	73	8	3	0	84	10	1.081
Fabula	468	374	95	0	4	70	16	9	0	95	25	1.062
Goldrush	365	303	77	1	12	69	13	4	0	87	17	1.071
LaChipper	401	327	83	2	12	74	7	5	0	86	12	1.071
LaRouge	453	388	99	1	8	76	12	3	0	91	15	1.070
Red LaSoda	436	378	96	0	6	60	25	9	0	94	34	1.067
Red Pontiac	435	355	90	1	8	69	15	6	0	90	21	1.068
Russet Burbank	412	226	57	3	29	58	11	0	0	69	11	1.073
Russet Norkotah	348	217	55	2	14	73	5	5	0	84	11	1.063
Sebago	417	324	82	1	12	78	5	4	0	86	9	1.070
Vivaldi	442	251	64	3	38	59	0	0	0	59	0	1.067
MSD3	98	117		ns	11	ns	20	7	ns	12	20	0.005
P Value	0.0001	0.0003		0.1198	0.0001	0.0537	0.0092	0.0022	0.4635	0.0001	0.0005	0.0001
1Marketable Yield: size classes A1 to A3. 2Size classes: C = .5 to 1.5" , B = 1.5 to 1 7/8", A1 = 1 7/8 to 2.5", A2 = 2.5 to 3.25", A3 = 3.25 to 4", A4 = >4" 3Means separated within columns by Tukey's Studentized Range (HSD) Test.

Table 3. Plant growth characteristics and tuber appearance of "Late Harvested" White, Red, and Russet-Skinned potato selections.

	Plant Growth Characteristics1
	%	Early	Vine	Vine	Tuber
Clone	Stand	Vigor	Type	Maturity	Appearance2
Atlantic	99	na	9-6	5.3	6
Adora	100	na	9-6	2.3	5
Andover	97	na	8	1.8	6
Belrus	99	na	9	3.0	7
Cherry Red	100	na	9	2.8	6
Fabula	85	na	8	5.5	6
Goldrush	100	na	9	3.0	8
LaChipper	100	na	9-6	1.5	7
LaRouge	100	na	9-6	3.0	6
Red LaSoda	100	na	9-6	3.5	5
Red Pontiac	100	na	9-6	2.3	3
Russet Burbank	98	na	8.8	5.3	4
Russet Norkotah	91	na	8-9	3.0	4
Sebago	98	na	8.5	4.3	5
Vivaldi	98	na	8-9	2.3	5
1See rating system outlined in Chapter 1. 2See rating system outlined in Chapter 1.

Table 4. External and internal defects of "Late Harvested" White, Red, and Russet-Skinned potato selections.

	% External Tuber Defects					% Internal Defects2
	Growth	Mis-	Sun-	Rotten	Total					Brown Center
Clone	Cracks	shapen	burned	& misc.	Culls1	HH	BR	CRS	IHN	L	M	H
Atlantic	0	0	1	4	5	0	0	0	5	0	0	0
Adora	0	4	3	6	12	0	0	0	0	0	0	0
Andover	0	0	1	6	7	0	0	0	0	0	0	0
Belrus	0	0	0	1	1	0	0	0	0	0	0	0
Cherry Red	0	0	0	3	3	0	0	0	0	0	0	0
Fabula	0	0	1	15	17	0	0	0	0	0	0	0
Goldrush	0	2	0	2	4	0	0	0	0	0	0	0
LaChipper	0	1	2	3	5	0	0	0	0	0	0	0
LaRouge	1	1	0	4	6	0	0	0	0	1	1	1
Red LaSoda	1	1	1	5	7	0	0	0	0	0	1	0
Red Pontiac	0	0	1	9	9	0	0	0	1	1	0	0
Russet Burbank	1	15	1	5	21	0	0	0	4	0	0	0
Russet Norkotah	0	0	0	29	30	0	0	0	0	0	0	1
Sebago	0	0	3	7	10	0	0	0	4	0	0	0
Vivaldi	0	0	1	4	5	0	0	0	0	0	0	0
MSD3	1	2	3	10	10	0	0	0	5	ns	ns	ns
P Value	0.0013	0.0001	0.0389	0.0039	0.0006	-	-	-	0.0201	0.4635	0.4635	0.4635
1Percent of Total Yield. Total culls include the sum of growth cracks, misshapen, sunburned and rotten/misc. 2Percent tubers; HH, hollow heart; BR, brown rot; CRS, corky ring spot; IHN, internal heat necrosis. Brown Center: L = Light, M = Moderate, H = Heavy 3Means separated within columns by Tukey's Studentized Range (HSD) Test.

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Footnotes

1. This document is HS1092, one of a series of the Horticultural Sciences Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date March 21, 2007. Visit the EDIS Web Site at http://edis.ifas.ufl.edu.

2. Chad M. Hutchinson, Associate professor, Doug Gergela, Sr. Bilogical Scientist, Horticultural Sciences Department, Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, 32611.

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