Dickinson Research Extension Center ~ 1089 State Avenue, Dickinson, ND 58601

Nitrogen Fertilizer Does Not Enhance
Yield or Quality of Forage-Pea in Low-Nitrogen Environments

Patrick M. Carr*, Woodrow W. Poland, and Lee J. Tisor
North Dakota State University
Dickinson Research Extension Center
1089 State Ave.
Dickinson, ND 58601


Some seedsmen claim that forage yield of inoculated pea (Pisum sativum L. subsp. sativum) can be enhanced in low-nitrogen (N) soils by applications of N-fertilizer. A 3-yr study was conducted at Dickinson in southwestern North Dakota, USA, to determine if applications of N-fertilizer enhanced pea yield or quality in soils containing < 34 kg nitrate-N/ha at planting. Nitrogen was broadcasted as urea (46-0-0) at 3 rates along with a check (0 N) in plots prior to planting the cultivar 'Arvika'. The pea seed was inoculated with Rhizobium leguminosarum prior to planting. Yield along with concentrations of crude protein, acid- and neutral-detergent fiber were determined. Applications of N-fertilizer failed to affect forage yield or quality. Results of this research indicate that applications of N-fertilizer are not necessary for optimum yield and quality of forage produced by pea when seed is inoculated with R. leguminosarum.

phone/email: Dr. Patrick M. Carr 701-483-2581 or pcarr@ndsuext.nodak.edu

General audience of paper: Research

Preferred subject matter area: Soil fertility and plant nutrition

Preferred Presentation Format: Oral