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Reference Report for IND81070122
Title:Agronomic performance of soybeans with differing levels of iron deficiency chlorosis on calcareous soil Nutritional disorders.
Authors:Froehlich, D.M., Fehr, W.R.
Source:Crop Sci. 1981, 21(3):438-441
Abstract:The relationship between agronomic performance and the amount of Fe deficiency chlorosis that sobyean cultivars sustain was determined. Fifteen cultivars ranging from highly resistant to highly susceptible to Fe chlorosis were tested on calcareous and noncalcareous soils in 5 Iowa [USA] 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 20% 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 Fe deficiency chlorosis for planning appropriate control measures.






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