2002 Agricultural Research Update - page 44

NITROGEN ON DRYLAND AND IRRIGATED DURUM IN THE MONDAK REGION

Joyce Eckhoff

Dryland fallow

N rate, lb/acre		‘Mountrail’ durum				‘Avonlea’ durum			‘McNeal’ spring wheat
Preplant N, lb/ac	Topdress N, lb/ac¹	Yield Bu/ac	Test Weight		Grain protein	Yield Bu/ac	Test Weight	Grain protein	Yield Bu/ac	Test Weight	Grain protein
2001		Planted: April 28				Harvested: August 20
0	0	62.4	61.9		12.0	50.0	61.8	13.3	56.8	61.4	12.8
	20	65.0	61.9		12.5	53.7	61.6	14.2	58.1	61.4	13.4
	TS	57.3	61.2		12.5	50.6	61.6	13.7	60.7	61.4	13.3
20	0	63.0	61.6		12.4	53.6	61.4	13.3	59.6	61.1	12.7
	20	64.3	61.4		13.1	58.8	61.6	14.0	63.2	61.0	13.5
	TS	62.5	61.1		12.9	50.2	61.1	14.1	60.9	61.0	13.2
40	0	62.7	61.4		12.6	57.6	61.5	13.7	63.0	60.9	13.2
	20	67.0	61.6		13.3	59.9	61.5	14.6	67.2	61.1	13.9
	TS	59.2	60.9		13.1	54.8	61.0	14.2	62.9	61.0	13.8
	LSD _0.05	5.3	0.4		0.6	6.3	0.3	0.7	ns	ns	0.7
2002		Planted: May 1				Harvested: August 15
0	0	40.7		59.4	14.4	34.5	59.0	14.8	40.3	57.9	13.9
	20	39.6		58.0	15.2	33.7	58.2	15.6	37.6	57.5	14.5
	TS	36.1		57.8	15.3	32.9	58.4	15.1	34.9	57.8	14.3
20	0	37.3		57.5	15.6	36.4	58.2	15.6	38.9	57.0	14.6
	20	37.6		58.0	16.0	36.8	58.5	15.6	39.2	56.6	15.1
	TS	38.8		58.5	15.4	33.6	57.6	16.2	36.2	56.9	14.6
40	0	37.5		57.2	15.8	37.7	58.1	16.1	41.6	56.8	14.8
	20	37.4		57.4	16.3	35.3	57.6	16.5	39.2	56.4	15.2
	TS	37.3		57.0	16.0	35.0	57.8	16.2	37.1	56.1	15.0
	LSD _0.05	ns		ns	1.3	2.8	ns	0.9	3.6	0.8	0.8

¹TS thiosul 20 lb/ac N and 13 lb/ac S

Flood Irrigation

N rate, lb/acre		‘Mountrail’ durum			‘Plaza’ durum			‘McNeal’ spring wheat
Preplant N, lb/ac¹	Topdress N, lb/ac²	Yield Bu/ac	Test Weight	Grain protein	Yield Bu/ac	Test Weight	Grain protein	Yield Bu/ac	Test Weight	Grain protein
2001		Planted: May 11			Harvested: August 21
0	0	62.4	60.4	14.0	76.4	61.5	13.4	74.1	60.8	13.2
	40	68.5	60.5	14.0	75.8	61.1	13.9	78.3	60.6