Oakes Irrigation Research Site
Carrington Research Extension Center * North Dakota State University
P.O. Box 531, Oakes, ND 58474-0531, Phone: (701) 742-2744, FAX: (701) 742-2700, E-mail:																Walter.Albus@ndsu.edu

The Response of Three Potato Cultivars to Nitrogen Rate

Table 1. Russet Burbank
Fertilizer								Specific	Hollow	Brown	Chlorophyll Meter					NDRE Value - Holland Sensor				Leaf Petiole Nitrate-N
N Rate	0-4 oz	4-6 oz	6-12 oz	>12 oz	Total	US # 2	Culls	Gravity¹	Heart²	Center²	7/23	7/29	8/11	8/24		8/4	8/14	8/25		7/23	7/29	8/11	8/24
lb/ac	--------------------------cwt/ac---------------------------								#	#										----------------ppm-----------------

120	87	124	158	27	396	0	24	1.087	1.5	0	32.3	31.6	27.5	22.4		0.255	0.221	0.169		1054	882	263	215
180	74	116	204	63	456	0	34	1.088	2.0	0	36.6	33.7	31.3	27.7		0.277	0.273	0.224		3154	4950	1568	136
240	81	100	169	82	432	0	47	1.086	1.3	0	38.4	36.2	37.1	33.7		0.305	0.313	0.280		11887	12441	5463	3902
300	84	90	199	87	460	0	27	1.084	1.0	0	41.1	41.5	38.0	36.4		0.313	0.326	0.304		17739	17549	9704	4140

Mean	81	107	183	65	436	0	33	1.086	1.4	0	37.1	35.7	33.5	30.0		0.288	0.283	0.244		8459	8956	4250	2098
CV%	22.3	18.7	17.6	29.5	10.8		40.7	0.3	64.7		2.1	1.6	1.1	5.1		1.4	3.1	4.9
LSD.05	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	2.5	1.9	1.2	4.8		0.013	0.028	0.038


Table 2. Bannock Russet
Fertilizer								Specific	Hollow	Brown	Chlorophyll Meter					NDRE Value - Holland Sensor				Leaf Petiole Nitrate-N
N Rate	0-4 oz	4-6 oz	6-12 oz	>12 oz	Total	US # 2	Culls	Gravity¹	Heart²	Center²	7/23	7/29	8/11	8/24		8/4	8/14	8/25		7/23	7/29	8/11	8/24
lb/ac	--------------------------cwt/ac---------------------------								#	#										----------------ppm-----------------

120	23	64	207	117	411	0	8	1.095	3.0	0.0	34	34.6	32.0	27.6		0.301	0.286	0.264		3154	3326	1217	267
180	22	40	185	151	398	0	16	1.093	4.5	0.0	36	36.3	34.2	31.0		0.310	0.320	0.298		4920	10277	2183	2023
240	16	35	185	157	392	0	12	1.094	2.8	0.0	37	36.2	37.0	32.9		0.326	0.342	0.324		14527	13650	9243	3124
300	20	33	137	195	385	16	4	1.088	2.8	0.3	39	38.7	38.0	35.6		0.328	0.354	0.343		16038	18386	11114	9130

Mean	20	43	178	155	397	4	10	1.092	3.3	0.1	36.3	36.4	35.3	31.7		0.316	0.326	0.307		9660	11410	5939	3636
CV%	29.6	32.3	21.0	21.3	5.5	231.4	14.7	0.3	33.8	282.8	2.5	4.9	5.1	5.2		2.5	3.7	4.1
LSD.05	NS	NS	NS	NS	NS	NS	5	NS	NS	NS	2.9	NS	NS	NS		NS	0.039	0.040


Table 3. Dakota Trailblazer
Fertilizer								Specific	Hollow	Brown	Chlorophyll Meter					NDRE Value - Holland Sensor				Leaf Petiole Nitrate-N
N Rate	0-4 oz	4-6 oz	6-12 oz	>12 oz	Total	US # 2	Culls	Gravity¹	Heart²	Center²	7/23	7/29	8/11	8/24		8/4	8/14	8/25		7/23	7/29	8/11	8/24
lb/ac	--------------------------cwt/ac---------------------------								#	#										----------------ppm-----------------

120	12	58	210	99	380	0	15	1.113	6	0	37.2	35.8	31.4	25.9		0.267	0.253	0.225		3039	982	470	241
180	11	50	247	109	418	0	13	1.114	4	0	39.7	36.3	32.9	29.7		0.275	0.280	0.259		2377	6515	690	398
240	20	37	215	150	422	0	10	1.114	2	0	39.3	38.7	38.3	35.9		0.289	0.331	0.313		12864	15108	8275	4679
300	11	22	206	197	436	0	17	1.109	3	0	42.1	41.0	40.5	39.0		0.306	0.337	0.325		17390	17577	12295	6837

Mean	14	42	219	139	414	0	14	1.113	4	0	39.6	37.9	35.8	32.6		0.284	0.300	0.281		8918	10046	5433	3039
CV%	44.0	34.1	23.8	41.5	3.1		74.9	0.6	33.3		0.8	3.4	1.5	3.2		2.8	1.5	4.0
LSD.05	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	1.0	NS	1.7	3.3		0.025	0.015	0.036

¹Specific gravity = [Weight in air/(Weight in air - Weight in water)] of ten 4-6, 6-8, 8-10, and
over 10 oz tubers, respectively.
²Ten tubers weighing 4-6, 6-8, 8-10, and over 10 ounces, respectively, were checked.
Planting date = April 16; Harvest date = October 5; previous crop corn.
Fertilizer rate lb/acre = See Table 5. for N, 43 P₂O₅, 53 K₂O, 21 S; Irrigation = 13.0"

Table 4. Fungicide treatments				Table 5. Nitrogen treatments

Detailed material and methods				Figure 1		Figure 2

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