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Agronomic Performance of Soybeans with Differing Levels of Iron Deficiency Chlorosis on Calcareous Soil¹

There are marked differences among soybean [Glycine max (L.) Merrill] cultivars for susceptibility iron deficiency chlorosis on calcareous soils. Our objective was to determine the relationship between agronomic performance and the amount of iron deficiency chlorosis that soybean cultivars sustain. Fifteen cultivars ranging from highly resistant to highly susceptible to iron chlorosis were tested on calcareous and noncalcareous soils in five Iowa environments during 1978 and 1979.

There was a significant linear relationship between percentage yield reduction and visual chlorosis scores. The average percentage yield loss increased by 90% for each unit increase in chlorosis score. There also was a significant linear relationship between percentage yield reduction and percentage height reduction, with a 1.6% yield loss for each 1% reduction in height. Because of the reduction in height, lodging was reduced as chlorosis symptoms increased. Maturity was delayed for cultivars that had severe chlorosis symptoms. Seed weight and protein and oil content were not significantly influenced by chlorosis expression. The results should facilitate the assessment of potential yield reduction from iron deficiency chlorosis for planning appropriate control measures.

Key Words: Glycine max (L.) Merrill • Breeding • Iron utilization • Yield • Maturity • Height • Lodging • Seed weight • Protein • Oil

² Graduate research assistant and professor, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.

Received for publication September 17, 1980.

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