Iron deficiency in plants grown in the great plains of the U.S.1

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Abstract
Iron (Fe) deficiency is a major problem limiting growth and production of many crop plants grown in the Great Plains. The soils of this area are generally neutral or alkaline and usually have underlying calcareous deposits. Water supply is usually limited in this area, so crops like sorghum and soybeans are often grown. With some exceptions, the Fe deficiency problem generally appears to increase from north to south and is most severe in sorghum and soybeans. Sorghum and soybean cannot be grown in many areas because of their susceptibility to Fe deficiency. Over 90% of the sorghum production in the U.S. is in the Great Plains, thus Fe deficiency in sorghum is important. Alleviation of Fe deficiency is expensive and difficult. Practical, economical, and longlasting or permanent solutions for overcoming the problem are needed. Information on existing problems, on research now being conducted, and on future research needs for Fe deficiencies in plants grown in the Great Plains has been presented.

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