1. USDA National Agriculture Statistical Service (2008) North Dakota Annual Statistical Bulletin. Fargo, North Dacota.
2. Stevens B, Belden K (2005) Nutrient Management Guidelines for Dry Beans of Wyoming. Laramie: University of Wyoming Cooperative Extension. 6 p.
3. Iron availability in plant tissues-iron chlorosis on calcareous soils;K Mengel;Plant Soil,1994
4. Marschner H (1995) Mineral Nutrition of Higher Plants 2nd Edition. Academic Press. 889 p.
5. Immunological characterization of a 36 kDa iron deficiency specific peptide in barley roots;K Suzuki;BioMetals,1997